CVE-2026-82461

HIGHPre-NVD 8.18.1—
EchelonGraph scoreHIGH confidence

Score 8.1 from GitHub Security Advisory (severity: HIGH) published 2026-08-29. a secondary CVSS source baseline 8.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: ghsa, secondary
Trending — 3 sources updated this week
8.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: —CVSS: 8.1Exploit: None knownExposed: 0

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

pac4j-oidc before 6.5.6 fails to verify access token signatures, issuers, audiences, or expiry when extracting Keycloak realm and client roles. Attackers can forge access tokens with administrative roles paired with valid ID tokens to bypass authorization checks in applications relying on pac4j role validation.

CVSS v3
8.1
EG Score
8.1(high)
EG Risk
41(Track)
EG Risk 41/100SSVC: 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
Severity81% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
—
EPSS %ILE
—
KEV
Not listed

Published

August 29, 2026

Last Modified

August 29, 2026

Advisory Details (5)

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

pac4j-oidc before 6.5.6 Privilege Escalation via Unverified Keycloak Access Token | Advisories | VulnCheck

https://www.vulncheck.com/advisories/pac4j-oidc-before-6.5.6-privilege-escalation-via-unverified-keycloak-access-token
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-oidc/src/main/java/org/pac4j/oidc/authorization/generator/KeycloakRolesAuthorizationGenerator.java at pac4j-parent-6.5.5 · pac4j/pac4j · GitHub

https://github.com/pac4j/pac4j/blob/pac4j-parent-6.5.5/pac4j-oidc/src/main/java/org/pac4j/oidc/authorization/generator/KeycloakRolesAuthorizationGenerator.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-2026-82461(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 5× in last 7d / 5× 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. 2026-08-30 05:36 UTCEG score recompute
  2. 2026-08-30 05:36 UTCGHSA enrichment
  3. 2026-08-29 17:29 UTCEG score recompute
  4. 2026-08-29 16:42 UTCEG score recompute
  5. 2026-08-29 16:37 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(4)

What is CVE-2026-82461?
CVE-2026-82461 is a high vulnerability published on August 29, 2026. pac4j-oidc before 6.5.6 fails to verify access token signatures, issuers, audiences, or expiry when extracting Keycloak realm and client roles. Attackers can forge access tokens with administrative roles paired with valid ID tokens to bypass authorization checks in applications relying on pac4j…
When was CVE-2026-82461 disclosed?
CVE-2026-82461 was first published in the National Vulnerability Database on August 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
What is the CVSS score of CVE-2026-82461?
CVE-2026-82461 has a CVSS v3 base score of 8.1 (NVD).
How do I remediate CVE-2026-82461?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-82461, 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

Explore the affected products and dependency analysis for CVE-2026-82461

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