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: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Analysis and contextual insights are available on OpenCVE Cloud.

Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

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: 2026-08-29T16:35:25.482Z

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

Link: CVE-2026-82461

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

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

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

Link: CVE-2026-82461

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

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

Weaknesses
  • CWE-347

    Improper Verification of Cryptographic Signature