Description
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.
Published: 2026-08-29
Score: 8.6 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Mon, 31 Aug 2026 19:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Sat, 29 Aug 2026 16:45:00 +0000

Type Values Removed Values Added
Description 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.
Title pac4j-oidc before 6.5.6 Privilege Escalation via Unverified Keycloak Access Token
First Time appeared Pac4j
Pac4j pac4j
Weaknesses CWE-347
CPEs cpe:2.3:a:pac4j:pac4j:*:*:*:*:*:*:*:*
Vendors & Products Pac4j
Pac4j pac4j
References
Metrics cvssV3_1

{'score': 8.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N'}

cvssV4_0

{'score': 8.6, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-08-31T18:52:57.662Z

Reserved: 2026-08-29T14:11:00.266Z

Link: CVE-2026-82461

cve-icon Vulnrichment

Updated: 2026-08-31T16:23:25.821Z

cve-icon NVD

Status : Received

Published: 2026-08-29T17:17:58.207

Modified: 2026-08-31T19:17:20.150

Link: CVE-2026-82461

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-29T18:30:13Z

Weaknesses