CVE-2026-55789

HIGHPre-NVD 8.58.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4% (31st percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Elevated
8.5EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 8.5Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

Logto is the modern, open-source auth infrastructure for SaaS and AI apps. Prior to 1.41.0, Logto's self-hosted SAML application IdP built the signed SAML response and assertion by string-substituting user-controlled profile attributes such as name, email, and custom attribute-mapping values into element-text placeholders of a SAML XML template using samlify 2.10.0, which left those placeholders unescaped. An authenticated low-privilege user could place XML markup in a profile attribute so Logto signed a forged SAML attribute, such as an arbitrary role, allowing privilege escalation at relying Service Providers that authorize on SAML attributes. This issue is fixed in version 1.41.0.

CVSS v3
8.5
EG Score
8.5HIGHmedium confidence
EG Risk
54
EG Risk 54/100

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)
Severity85% × 45%
The EG Score, 8.5 of 10.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
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 public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (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.
EPSS PROB
0.4%
EPSS %ILE
32nd
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 available. Apply it within your standard update timelines.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (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

Published

July 10, 2026

Last Modified

July 13, 2026

Advisory Details (4)

Auto-updated Jul 10, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit, github_pr, github_release, github.
githubMentions a patch (unverified)🟡 PoC Available

SAML IdP injects user-controlled profile attributes raw into signed assertions, allowing privilege escalation at relying Service Providers · Advisory · logto-io/logto · GitHub

https://github.com/logto-io/logto/security/advisories/GHSA-vfpw-vq44-4p63
github_release Patch Available

v1.41.0

Patch available: logto-io/logto v1.41.0

https://github.com/logto-io/logto/releases/tag/v1.41.0
github_pr Patch Available

fix(core): upgrade samlify to ^2.13.0

Patch available: logto-io/logto v1.41.0 (PR #9107 merged 2026-06-30)

https://github.com/logto-io/logto/pull/9107
github_commit Patch Available

commit 9097054860f0 (logto-io/logto)

Patch available: logto-io/logto v1.41.0 (contains commit 9097054860f0)

https://github.com/logto-io/logto/commit/9097054860f0d638d90778d3dcde2ba050b844b6

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 33× 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 131 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 31 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  2. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  3. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  4. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  5. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  6. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  7. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  8. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  9. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  10. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  11. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  12. 2026-10-01 14:58 UTCEG score recompute
  13. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  14. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  15. 2026-09-28 09:46 UTCEG score recompute
  16. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  17. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  18. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  19. 2026-09-24 11:09 UTCEG score recompute
  20. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  21. 2026-09-23 05:44 UTCEG score recompute
  22. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  23. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  24. 2026-09-18 05:17 UTCEG score recompute
  25. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.4% · 34th percentile
Show 75 more
  1. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  2. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  3. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  4. 2026-09-13 23:39 UTCEG score recompute
  5. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  6. 2026-09-12 15:29 UTCEG score recompute
  7. 2026-09-12 02:50 UTCEG score recompute
  8. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  9. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  10. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  11. 2026-09-08 02:46 UTCEG score recompute
  12. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  13. 2026-09-06 13:56 UTCEG score recompute
  14. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  15. 2026-09-05 21:41 UTCEG score recompute
  16. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  17. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  18. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  19. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  20. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  21. 2026-08-30 06:16 UTCEG score recompute
  22. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  23. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  24. 2026-08-27 21:40 UTCEG score recompute
  25. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  26. 2026-08-27 00:46 UTCEG score recompute
  27. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  28. 2026-08-26 03:33 UTCEG score recompute
  29. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  30. 2026-08-24 21:59 UTCEG score recompute
  31. 2026-08-23 06:24 UTCEG score recompute
  32. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  33. 2026-08-22 05:16 UTCEG score recompute
  34. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  35. 2026-08-21 03:45 UTCEG score recompute
  36. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  37. 2026-08-20 01:32 UTCEG score recompute
  38. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  39. 2026-08-18 20:32 UTCEG score recompute
  40. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  41. 2026-08-17 17:00 UTCEG score recompute
  42. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  43. 2026-08-16 15:53 UTCEG score recompute
  44. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  45. 2026-08-16 03:19 UTCEG score recompute
  46. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  47. 2026-08-15 02:12 UTCEG score recompute
  48. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  49. 2026-08-14 01:05 UTCEG score recompute
  50. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  51. 2026-08-12 23:55 UTCEG score recompute
  52. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  53. 2026-08-11 22:48 UTCEG score recompute
  54. 2026-08-11 10:14 UTCEG score recompute
  55. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  56. 2026-08-09 20:33 UTCEG score recompute
  57. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  58. 2026-08-08 19:26 UTCEG score recompute
  59. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  60. 2026-08-07 18:19 UTCEG score recompute
  61. 2026-08-06 17:11 UTCEG score recompute
  62. 2026-08-06 13:47 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  63. 2026-08-06 04:38 UTCEG score recompute
  64. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  65. 2026-08-05 03:31 UTCEG score recompute
  66. 2026-08-04 15:10 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  67. 2026-08-04 14:57 UTCEG score recompute
  68. 2026-08-04 10:39 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  69. 2026-08-03 13:50 UTCEG score recompute
  70. 2026-08-03 10:36 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  71. 2026-08-02 12:42 UTCEG score recompute
  72. 2026-08-02 02:27 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  73. 2026-08-01 11:34 UTCEG score recompute
  74. 2026-08-01 04:16 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  75. 2026-07-30 21:48 UTCEG score recompute

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Frequently asked(5)

What is CVE-2026-55789?
CVE-2026-55789 is a high vulnerability published on July 10, 2026. Logto is the modern, open-source auth infrastructure for SaaS and AI apps. Prior to 1.41.0, Logto's self-hosted SAML application IdP built the signed SAML response and assertion by string-substituting user-controlled profile attributes such as name, email, and custom attribute-mapping values into…
When was the CVE record for CVE-2026-55789 published?
The CVE record for CVE-2026-55789 was published on July 10, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of July 13, 2026; the record at its source may have been updated since.
Is CVE-2026-55789 actively exploited?
CVE-2026-55789 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (32nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-55789?
CVE-2026-55789 has a CVSS base score of 8.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-55789?
A fix for CVE-2026-55789 is available: update to the fixed version the vendor names in its advisory.

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