CVE-2026-35056

HIGHPre-NVD 7.28.8
EchelonGraph scoreMEDIUM confidence

“▲” beside the score: it is higher than the CVSS score beside it.

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-04-01. The CNA's CVSS baseline 7.2; sources differ by 1.6.

Triggered by: GitHub Security Advisory CVSS
Sources: the CNA's CVSS, EPSS, GitHub Security Advisory
8.8EG
EchelonGraph verdictPlan mitigationRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.9%CVSS: 7.2Exploit: None knownExposed services: Not assessed

A fix is referenced (a reference tagged "Patch", often a source commit), but no release containing it is confirmed — find the release that contains it; until it is applied, mitigate (WAF / firewall / segmentation).

XenForo before 2.3.9 and before 2.2.18 allows remote code execution (RCE) by authenticated, but malicious, admin users. An attacker with admin panel access can execute arbitrary code on the server.

CVSS v3
7.2
EG Score
8.8HIGHmedium confidence
EG Risk
40
EG Risk 40/100

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)
Severity88% × 45%
The EG Score, 8.8 of 10.
Exploitation0.9% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable no (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 referenced, but no release containing it is confirmed. Check the referenced fix and the vendor's advisory for a release that contains it and apply that within your standard update timelines; until then, restrict network exposure of the affected system or apply the vendor's mitigation.
EPSS PROB
0.9%
EPSS %ILE
58th
KEV
Not listed

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

A fix is referenced, but no release containing it is confirmed. Check the referenced fix and the vendor's advisory for a release that contains it and apply that within your standard update timelines; until then, restrict network exposure of the affected system or apply the vendor's mitigation.

Exploitation none (CISA Vulnrichment) · Automatable no (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)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (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

April 1, 2026

Last Modified

May 25, 2026

Advisory Details (1)

Auto-updated Aug 2, 2026
Fix referenced — no release confirmed yet.
Web page

XenForo Remote Code Execution via Authenticated Admin | Advisories | VulnCheck

https://www.vulncheck.com/advisories/xenforo-remote-code-execution-via-authenticated-admin

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 27× 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 99 of 207 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. 1 repeat row among the latest 100 is merged into the row it repeats. The 108 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-16 16:41 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  2. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  3. 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  4. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  5. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  6. 2026-10-12 16:12 UTCEG score recompute
  7. 2026-10-11 19:54 UTCEG score recompute
  8. 2026-10-11 17:07 UTCEG score recompute
  9. 2026-10-11 14:34 UTCEG score recompute
  10. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  11. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  12. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  13. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  14. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  15. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  16. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  17. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  18. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  19. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  20. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  21. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.9% · 57th percentile
  22. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.9% · 57th percentile
  23. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.9% · 57th percentile
  24. 2026-09-26 00:26 UTCEPSS rescoreEPSS 0.9% · 57th percentile
  25. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.7% · 50th percentile
Show 74 more
  1. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  2. 2026-09-17 19:30 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  3. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  4. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  5. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  6. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  7. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  8. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  9. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  10. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  11. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  12. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  13. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  14. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  15. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  16. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  17. 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  18. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  19. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.7% · 48th percentile
  20. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.7% · 48th percentile
  21. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  22. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  23. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  24. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  25. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  26. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  27. 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.7% · 49th percentile
  28. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.7% · 48th percentile
  29. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.7% · 48th percentile
  30. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.7% · 48th percentile
  31. 2026-08-16 09:34 UTCEG score recompute
  32. 2026-08-16 09:34 UTCGHSA enrichmentGHSA-wrgm-wvxf-c44c · GitHub severity HIGH · GitHub CVSS 8.8
  33. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.7% · 48th percentile
  34. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.7% · 48th percentile
  35. 2026-08-14 19:04 UTCGHSA enrichmentGHSA-wrgm-wvxf-c44c · GitHub severity HIGH · GitHub CVSS 8.8
  36. 2026-08-14 05:59 UTCEG score recompute
  37. 2026-08-14 05:59 UTCGHSA enrichmentGHSA-wrgm-wvxf-c44c · GitHub severity HIGH · GitHub CVSS 8.8
  38. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.7% · 48th percentile
  39. 2026-08-13 10:55 UTCGHSA enrichmentGHSA-wrgm-wvxf-c44c · GitHub severity HIGH · GitHub CVSS 8.8
  40. 2026-08-12 20:15 UTCEG score recompute
  41. 2026-08-12 20:15 UTCGHSA enrichmentGHSA-wrgm-wvxf-c44c · GitHub severity HIGH · GitHub CVSS 8.8
  42. 2026-08-12 13:50 UTCEPSS rescoreEPSS 0.7% · 48th percentile
  43. 2026-08-11 20:35 UTCEG score recompute
  44. 2026-08-11 20:35 UTCGHSA enrichmentGHSA-wrgm-wvxf-c44c · GitHub severity HIGH · GitHub CVSS 8.8
  45. 2026-08-11 03:35 UTCEG score recompute
  46. 2026-08-11 03:35 UTCGHSA enrichmentGHSA-wrgm-wvxf-c44c · GitHub severity HIGH · GitHub CVSS 8.8
  47. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.7% · 48th percentile
  48. 2026-08-10 06:30 UTCGHSA enrichmentGHSA-wrgm-wvxf-c44c · GitHub severity HIGH · GitHub CVSS 8.8
  49. 2026-08-09 18:02 UTCEG score recompute
  50. 2026-08-09 18:02 UTCGHSA enrichmentGHSA-wrgm-wvxf-c44c · GitHub severity HIGH · GitHub CVSS 8.8
  51. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.7% · 48th percentile
  52. 2026-08-09 05:33 UTCEG score recompute
  53. 2026-08-09 05:33 UTCGHSA enrichmentGHSA-wrgm-wvxf-c44c · GitHub severity HIGH · GitHub CVSS 8.8
  54. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.7% · 48th percentile
  55. 2026-08-08 04:07 UTCEG score recompute
  56. 2026-08-08 04:07 UTCGHSA enrichmentGHSA-wrgm-wvxf-c44c · GitHub severity HIGH · GitHub CVSS 8.8
  57. 2026-08-07 15:38 UTCGHSA enrichmentGHSA-wrgm-wvxf-c44c · GitHub severity HIGH · GitHub CVSS 8.8
  58. 2026-08-06 18:10 UTCEG score recompute
  59. 2026-08-06 18:10 UTCGHSA enrichmentGHSA-wrgm-wvxf-c44c · GitHub severity HIGH · GitHub CVSS 8.8
  60. 2026-08-06 13:46 UTCEPSS rescoreEPSS 0.7% · 48th percentile
  61. 2026-08-06 00:32 UTCEG score recompute
  62. 2026-08-06 00:32 UTCGHSA enrichmentGHSA-wrgm-wvxf-c44c · GitHub severity HIGH · GitHub CVSS 8.8
  63. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.7% · 48th percentile
  64. 2026-08-04 15:10 UTCEPSS rescoreEPSS 0.7% · 48th percentile
  65. 2026-08-04 10:38 UTCEPSS rescoreEPSS 0.7% · 48th percentile
  66. 2026-08-03 22:52 UTCEG score recompute
  67. 2026-08-03 22:52 UTCGHSA enrichmentGHSA-wrgm-wvxf-c44c · GitHub severity HIGH · GitHub CVSS 8.8
  68. 2026-08-03 10:36 UTCEPSS rescoreEPSS 0.7% · 48th percentile
  69. 2026-08-02 14:52 UTCEG score recompute
  70. 2026-08-02 14:52 UTCGHSA enrichmentGHSA-wrgm-wvxf-c44c · GitHub severity HIGH · GitHub CVSS 8.8
  71. 2026-08-02 02:27 UTCEPSS rescoreEPSS 0.7% · 48th percentile
  72. 2026-08-01 04:16 UTCEPSS rescoreEPSS 0.7% · 48th percentile
  73. 2026-07-30 16:28 UTCEPSS rescoreEPSS 0.7% · 48th percentile
  74. 2026-07-30 01:30 UTCEPSS rescoreEPSS 0.7% · 48th percentile

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Frequently asked(5)

What is CVE-2026-35056?
CVE-2026-35056 is a high-severity vulnerability; its CVE record was published on April 1, 2026. XenForo before 2.3.9 and before 2.2.18 allows remote code execution (RCE) by authenticated, but malicious, admin users. An attacker with admin panel access can execute arbitrary code on the server.
When was CVE-2026-35056 made public?
CVE-2026-35056 was made public on February 5, 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 April 1, 2026. EchelonGraph's copy of the record carries a last-modified date of May 25, 2026; the record at its source may have been updated since.
Is CVE-2026-35056 actively exploited?
CVE-2026-35056 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.9% probability of exploitation in the next 30 days (58th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-35056?
CVE-2026-35056 has a CVSS base score of 7.2 (the CNA's own assessment, by vulncheck; NVD's own analysis pending). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 8.8 (HIGH).
How do I remediate CVE-2026-35056?
A fix for CVE-2026-35056 is referenced (a reference tagged "Patch", often a source commit), but EchelonGraph has no release containing it on record. Check that reference and the vendor's advisory for a release that contains the fix and update to it; until then, restrict network exposure of the affected system or apply the vendor's mitigation.

Dependency Blast Radius

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