CVE-2026-82465

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreHIGH confidence

Score 5.3 from GitHub Security Advisory published 2026-08-29. a secondary CVSS source baseline 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.3Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

pac4j-saml before 6.5.6 does not require signature validation of SAML LogoutRequest messages in SAML2LogoutValidator.validateLogoutRequest(). When an IdP sends no SessionIndex, a session can be destroyed based solely on the NameID, allowing an unauthenticated attacker to submit an unsigned LogoutRequest with a guessed identifier (e.g., an email address used as NameID) to terminate a victim's SAML session.

CVSS v3
5.3
EG Score
5.3(high)
EG Risk
24(Track)
EG Risk 24/100SSVC: Track

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
Severity53% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
8%
KEV
Not listed

Published

August 29, 2026

Last Modified

September 10, 2026

Advisory Details (5)

Auto-updated Aug 29, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
generic

pac4j-saml before 6.5.6 Session Destruction via Unsigned LogoutRequest | Advisories | VulnCheck

https://www.vulncheck.com/advisories/pac4j-saml-before-6.5.6-session-destruction-via-unsigned-logoutrequest
generic

GitHub - pac4j/pac4j: Security engine for Java (authentication, authorization, multi frameworks): OpenID Connect, SAML2, CAS, OAuth, LDAP, JWT... · GitHub

https://github.com/pac4j/pac4j
generic

pac4j/pac4j-saml/src/main/java/org/pac4j/saml/logout/impl/SAML2LogoutValidator.java at pac4j-parent-6.5.5 · pac4j/pac4j · GitHub

https://github.com/pac4j/pac4j/blob/pac4j-parent-6.5.5/pac4j-saml/src/main/java/org/pac4j/saml/logout/impl/SAML2LogoutValidator.java
generic

Security advisory for pac4j-core, pac4j-oidc and pac4j-saml | pac4j

https://www.pac4j.org/blog/security-advisory-pac4j-core-oidc-saml.html
github_commit

commit 2270c3ff70e9 (pac4j/pac4j)

Fix landed in pac4j/pac4j commit 2270c3ff70e9 — awaiting tagged release

https://github.com/pac4j/pac4j/commit/2270c3ff70e93cc43831e75702acd5135531237e

Vendor Advisories for CVE-2026-82465(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 19× in last 7d / 60× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. 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. Most recent first.

  1. 2026-09-19 16:45 UTCEG score recompute
  2. 2026-09-19 16:45 UTCGHSA enrichment
  3. 2026-09-18 19:28 UTCEPSS rescore
  4. 2026-09-18 14:20 UTCEG score recompute
  5. 2026-09-18 14:20 UTCGHSA enrichment
  6. 2026-09-17 11:38 UTCEG score recompute
  7. 2026-09-17 11:38 UTCGHSA enrichment
  8. 2026-09-16 14:08 UTCEPSS rescore
  9. 2026-09-16 09:10 UTCEG score recompute
  10. 2026-09-16 09:10 UTCGHSA enrichment
  11. 2026-09-16 05:15 UTCEPSS rescore
  12. 2026-09-15 06:32 UTCEG score recompute
  13. 2026-09-15 06:32 UTCGHSA enrichment
  14. 2026-09-15 03:12 UTCEPSS rescore
  15. 2026-09-15 03:12 UTCEPSS rescore
  16. 2026-09-14 04:08 UTCEG score recompute
  17. 2026-09-14 04:08 UTCGHSA enrichment
  18. 2026-09-13 01:44 UTCEG score recompute
  19. 2026-09-13 01:44 UTCGHSA enrichment
  20. 2026-09-11 23:19 UTCEG score recompute
  21. 2026-09-11 23:19 UTCGHSA enrichment
  22. 2026-09-11 14:53 UTCEPSS rescore
  23. 2026-09-11 14:53 UTCEPSS rescore
  24. 2026-09-10 20:01 UTCGHSA enrichment
  25. 2026-09-10 18:00 UTCEG score recompute
Show 35 more
  1. 2026-09-10 18:00 UTCGHSA enrichment
  2. 2026-09-09 15:36 UTCEG score recompute
  3. 2026-09-09 15:36 UTCGHSA enrichment
  4. 2026-09-08 22:01 UTCEPSS rescore
  5. 2026-09-08 13:11 UTCEG score recompute
  6. 2026-09-08 13:11 UTCGHSA enrichment
  7. 2026-09-07 10:07 UTCEG score recompute
  8. 2026-09-07 10:07 UTCGHSA enrichment
  9. 2026-09-06 13:48 UTCEPSS rescore
  10. 2026-09-06 07:42 UTCEG score recompute
  11. 2026-09-06 07:42 UTCGHSA enrichment
  12. 2026-09-05 15:31 UTCEPSS rescore
  13. 2026-09-05 05:18 UTCEG score recompute
  14. 2026-09-05 05:18 UTCGHSA enrichment
  15. 2026-09-04 05:07 UTCEPSS rescore
  16. 2026-09-04 02:51 UTCGHSA enrichment
  17. 2026-09-03 00:25 UTCEG score recompute
  18. 2026-09-03 00:25 UTCGHSA enrichment
  19. 2026-09-02 14:12 UTCEPSS rescore
  20. 2026-09-01 21:53 UTCEG score recompute
  21. 2026-09-01 21:53 UTCGHSA enrichment
  22. 2026-09-01 13:54 UTCEPSS rescore
  23. 2026-09-01 04:40 UTCEPSS rescore
  24. 2026-09-01 04:40 UTCEPSS rescore
  25. 2026-08-31 19:29 UTCEG score recompute
  26. 2026-08-31 19:29 UTCGHSA enrichment
  27. 2026-08-31 18:33 UTCEG score recompute
  28. 2026-08-31 18:33 UTCGHSA enrichment
  29. 2026-08-30 19:52 UTCEG score recompute
  30. 2026-08-30 19:52 UTCGHSA enrichment
  31. 2026-08-30 19:18 UTCEPSS rescore
  32. 2026-08-30 19:17 UTCEPSS rescore
  33. 2026-08-29 17:28 UTCEG score recompute
  34. 2026-08-29 16:41 UTCEG score recompute
  35. 2026-08-29 16:37 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-82465?
CVE-2026-82465 is a medium vulnerability published on August 29, 2026. pac4j-saml before 6.5.6 does not require signature validation of SAML LogoutRequest messages in SAML2LogoutValidator.validateLogoutRequest(). When an IdP sends no SessionIndex, a session can be destroyed based solely on the NameID, allowing an unauthenticated attacker to submit an unsigned…
When was CVE-2026-82465 disclosed?
CVE-2026-82465 was first published in the National Vulnerability Database on August 29, 2026, with the most recent update on September 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-82465 actively exploited?
CVE-2026-82465 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 92.1% of all scored CVEs.
What is the CVSS score of CVE-2026-82465?
CVE-2026-82465 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-82465?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-82465, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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