CVE-2026-82461CWE-347

CVE-2026-82461

High · published August 29, 2026

CVSS v3.1
8.1
EPSS
0%
Percentile
23.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
8.1 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
CVSS v4.0
8.6 · 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
EPSS
0.00316 · 23.4th percentile
Weakness
CWE-347 · Improper Verification of Cryptographic Signature
Published
2026-08-29T21:17Z
References (5)
https://github.com/pac4j/pac4j · [email protected]https://github.com/pac4j/pac4j/blob/pac4j-parent-6.5.5/pac4j-oidc/src/main/java/org/pac4j/oidc/authorization/generator/KeycloakRolesAuthorizationGenerator.java · [email protected]https://github.com/pac4j/pac4j/commit/2270c3ff70e93cc43831e75702acd5135531237e · [email protected]https://www.pac4j.org/blog/security-advisory-pac4j-core-oidc-saml.html · [email protected]https://www.vulncheck.com/advisories/pac4j-oidc-before-6.5.6-privilege-escalation-via-unverified-keycloak-access-token · [email protected]
EPSS history
Timeline
  • 30 AUG 16:19Z
    EPSS moved — → 0%
    epss
  • 29 AUG 16:35Z
    pac4j-oidc before 6.5.6 Privilege Escalation via Unverified Keycloak Access Token
    cvelistv5