CVE-2026-80428

CRITICALPre-NVD 9.89.8
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-26. A secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source
Trending — 3 sources updated this weekElevated
9.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • Public exploit or proof-of-concept code is available
CISA-KEV: Not listedEPSS PROB: 4.7%CVSS: 9.8Exploit: Public PoCExposed services: Not assessed

A fix is available — apply it.

ILIAS before versions 9.22, 10.10, and 11.3 contains an unauthenticated PHP object injection vulnerability that allows unauthenticated attackers to execute arbitrary code by injecting serialized objects through the LTI authentication endpoint and triggering deserialization via the Shibboleth back-channel logout endpoint. Attackers can write arbitrary serialized objects into session storage, then exploit an available POP gadget through the logout endpoint's unrestricted deserialization to write attacker-controlled PHP content to a web-accessible path and achieve remote code execution as the web server user.

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
75
EG Risk 75/100

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed (value × EchelonGraph’s weight)
Severity98% × 45%
The EG Score, 9.8 of 10.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
4.7%
EPSS %ILE
91st
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)3 days if the affected system is publicly exposed; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

August 26, 2026

Last Modified

September 30, 2026

Advisory Details (11)

Auto-updated Oct 7, 2026
Patch available.
Web page

Unauthenticated PHP object injection in the Shibboleth logout endpoint of ILIAS – Poking on ILIAS | SchweigertIT

https://schweigertit.de/en/writeups/php-object-injection-shibboleth-logout.html
Web pageMentions a patch (unverified)

CVE-2026-80428: Unauthenticated PHP object injection in the Shibboleth logout endpoint of ILIAS (SIT-2026-002) | SchweigertIT

https://schweigertit.de/en/advisories/SIT-2026-002.html
Web page

Download & Releases: DOCU

https://docu.ilias.de/ilias.php?baseClass=illmpresentationgui&obj_id=225632&ref_id=35
Web page

Download & Releases: DOCU

https://docu.ilias.de/ilias.php?baseClass=illmpresentationgui&obj_id=225631&ref_id=35
Web page

Download & Releases: DOCU

https://docu.ilias.de/ilias.php?baseClass=illmpresentationgui&obj_id=225630&ref_id=35
Web page

Security-Blog: DOCU

https://docu.ilias.de/ilias.php?baseClass=ilrepositorygui&cmdNode=wy:ll:6t&cmdClass=ilBlogPostingGUI&cmd=previewFullscreen&ref_id=15821&blpg=936
Web page

Security-Blog: DOCU

https://docu.ilias.de/ilias.php?baseClass=ilrepositorygui&cmdNode=wy:ll:6t&cmdClass=ilBlogPostingGUI&cmd=previewFullscreen&ref_id=15821&blpg=935
Web page

Security-Blog: DOCU

https://docu.ilias.de/ilias.php?baseClass=ilrepositorygui&cmdNode=wy:ll:6t&cmdClass=ilBlogPostingGUI&cmd=previewFullscreen&ref_id=15821&blpg=934
Web page

ILIAS before 9.22, 10.10 and 11.3 Unauthenticated PHP Object Injection via Shibboleth Logout Endpoint | Advisories | VulnCheck

https://www.vulncheck.com/advisories/ilias-before-9.22-10.10-and-11.3-unauthenticated-php-object-injection-via-shibboleth-logout-endpoint
GitHub commit Patch Available

commit f36934a6f937 (ILIAS-eLearning/ILIAS)

Patch available: ILIAS-eLearning/ILIAS v10.10 (contains commit f36934a6f937)

https://github.com/ILIAS-eLearning/ILIAS/commit/f36934a6f937d0fe837ca6e642986458b4069a95
Web page

GitHub - ILIAS-eLearning/ILIAS: GitHub repository for official ILIAS release branches and development branches (trunk) · GitHub

https://github.com/ILIAS-eLearning/ILIAS

Vendor Advisories for CVE-2026-80428(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 27× in last 7d / 194× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 349 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 249 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-14 01:36 UTCEG score recompute
  2. 2026-10-14 01:36 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  3. 2026-10-13 16:35 UTCEPSS rescoreEPSS 4.7% · 91st percentile
  4. 2026-10-12 21:47 UTCEG score recompute
  5. 2026-10-12 21:46 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  6. 2026-10-12 16:35 UTCEPSS rescoreEPSS 4.7% · 91st percentile
  7. 2026-10-12 14:57 UTCEG score recompute
  8. 2026-10-12 05:23 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  9. 2026-10-11 19:21 UTCEG score recompute
  10. 2026-10-11 16:37 UTCEG score recompute
  11. 2026-10-11 13:55 UTCEG score recompute
  12. 2026-10-11 13:49 UTCEPSS rescoreEPSS 4.7% · 91st percentile
  13. 2026-10-10 20:00 UTCEPSS rescoreEPSS 4.7% · 91st percentile
  14. 2026-10-10 14:10 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  15. 2026-10-10 09:58 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  16. 2026-10-10 06:06 UTCEG score recompute
  17. 2026-10-10 06:06 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  18. 2026-10-09 20:07 UTCEPSS rescoreEPSS 4.7% · 91st percentile
  19. 2026-10-09 07:18 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  20. 2026-10-09 03:22 UTCEG score recompute
  21. 2026-10-09 03:22 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  22. 2026-10-08 17:13 UTCEPSS rescoreEPSS 4.7% · 91st percentile
  23. 2026-10-08 09:35 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  24. 2026-10-08 05:43 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  25. 2026-10-08 01:51 UTCEG score recompute
Show 75 more
  1. 2026-10-08 01:51 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  2. 2026-10-07 23:48 UTCEPSS rescoreEPSS 4.7% · 91st percentile
  3. 2026-10-07 07:38 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  4. 2026-10-07 03:46 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  5. 2026-10-06 23:41 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  6. 2026-10-06 19:49 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  7. 2026-10-06 15:57 UTCEG score recompute
  8. 2026-10-06 15:57 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  9. 2026-10-06 15:18 UTCEPSS rescoreEPSS 4.7% · 91st percentile
  10. 2026-10-06 11:51 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  11. 2026-10-06 07:35 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  12. 2026-10-06 01:41 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  13. 2026-10-05 20:45 UTCEG score recompute
  14. 2026-10-05 20:45 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  15. 2026-10-05 17:43 UTCEPSS rescoreEPSS 4.7% · 91st percentile
  16. 2026-10-05 16:54 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  17. 2026-10-05 11:35 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  18. 2026-10-05 07:37 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  19. 2026-10-05 03:45 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  20. 2026-10-04 23:33 UTCEG score recompute
  21. 2026-10-04 23:33 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  22. 2026-10-04 23:22 UTCEPSS rescoreEPSS 4.7% · 91st percentile
  23. 2026-10-04 19:41 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  24. 2026-10-04 13:46 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  25. 2026-10-04 09:55 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  26. 2026-10-04 05:50 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  27. 2026-10-04 01:58 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  28. 2026-10-03 19:57 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  29. 2026-10-03 16:06 UTCEG score recompute
  30. 2026-10-03 16:06 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  31. 2026-10-03 14:26 UTCEPSS rescoreEPSS 4.7% · 91st percentile
  32. 2026-10-03 05:31 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  33. 2026-10-03 01:39 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  34. 2026-10-02 21:47 UTCEG score recompute
  35. 2026-10-02 21:47 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  36. 2026-10-02 17:57 UTCEPSS rescoreEPSS 4.7% · 91st percentile
  37. 2026-10-02 17:55 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  38. 2026-10-02 14:04 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  39. 2026-10-02 10:12 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  40. 2026-10-02 06:21 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  41. 2026-10-02 01:15 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  42. 2026-10-01 19:55 UTCEG score recompute
  43. 2026-10-01 19:55 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  44. 2026-10-01 19:50 UTCEPSS rescoreEPSS 4.7% · 91st percentile
  45. 2026-10-01 13:15 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  46. 2026-10-01 09:24 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  47. 2026-10-01 05:32 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  48. 2026-10-01 01:10 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  49. 2026-09-30 21:19 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  50. 2026-09-30 17:27 UTCEG score recompute
  51. 2026-09-30 17:27 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  52. 2026-09-30 16:51 UTCEG score recompute
  53. 2026-09-30 16:51 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  54. 2026-09-30 15:04 UTCEPSS rescoreEPSS 4.5% · 91st percentile
  55. 2026-09-30 09:54 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  56. 2026-09-30 06:03 UTCEG score recompute
  57. 2026-09-30 06:03 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  58. 2026-09-29 12:26 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  59. 2026-09-29 05:16 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  60. 2026-09-29 01:24 UTCEG score recompute
  61. 2026-09-29 01:24 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  62. 2026-09-28 21:20 UTCEG score recompute
  63. 2026-09-28 21:20 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  64. 2026-09-28 13:52 UTCEPSS rescoreEPSS 4.5% · 91st percentile
  65. 2026-09-28 12:44 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  66. 2026-09-28 08:53 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  67. 2026-09-28 05:01 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  68. 2026-09-28 01:10 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  69. 2026-09-27 21:18 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  70. 2026-09-27 17:27 UTCEG score recompute
  71. 2026-09-27 17:27 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  72. 2026-09-27 13:48 UTCEPSS rescoreEPSS 4.5% · 91st percentile
  73. 2026-09-27 13:34 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  74. 2026-09-27 09:40 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  75. 2026-09-27 05:49 UTCGHSA enrichmentGHSA-6h76-35rh-gxm9 · GitHub severity CRITICAL · GitHub CVSS 9.8

Publicly available exploits

(2 references)

Public exploit code is referenced for this CVE (1 Exploit-DB entry, 1 GitHub PoC). Defenders should treat patch urgency accordingly.

  • GitHub PoCHackfutSecRoot/CVE-2026-80428
    Published Oct 9, 2026

    ILIAS ≤ 9.21 / 10.9 / 11.2 — Unauthenticated PHP Object Injection (RCE)

    Open source ↗
  • Exploit-DBEDB-52682
    Published Sep 11, 2026

    CVE-2026-80428 Unauthenticated PHP Object Injection via Shibboleth - ILIAS < 9.22_ 10.0 < 10.10_ 11.0 < 11.3 - RCE

    Open source ↗

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-80428?
CVE-2026-80428 is a critical-severity vulnerability; its CVE record was published on August 26, 2026. ILIAS before versions 9.22, 10.10, and 11.3 contains an unauthenticated PHP object injection vulnerability that allows unauthenticated attackers to execute arbitrary code by injecting serialized objects through the LTI authentication endpoint and triggering deserialization via the Shibboleth…
When was CVE-2026-80428 made public?
CVE-2026-80428 was made public on August 26, 2026: that is the date its CVE record's CNA, VulnCheck, gives for when the vulnerability was made public. The CVE record itself was published on August 26, 2026. EchelonGraph's copy of the record carries a last-modified date of September 30, 2026; the record at its source may have been updated since.
Is CVE-2026-80428 actively exploited?
CVE-2026-80428 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 4.7% probability of exploitation in the next 30 days (91st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-80428?
CVE-2026-80428 has a CVSS base score of 9.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-80428?
A fix for CVE-2026-80428 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-80428 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-80428

Explore →

Is Your Infrastructure Affected by CVE-2026-80428?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs