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CVE-2026-82461— pac4j-oidc before 6.5.6 Privilege Escalation via Unverified Keycloak Access Token

Quick assessment

Affected
pac4j pac4j
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

pac4j-oidc 在 6.5.6 版本之前，在提取 Keycloak 的 realm 和客户端角色时，未能验证访问令牌（access token）的签名、签发者（issuer）、受众（audience）或过期时间。攻击者可以伪造带有管理员角色的访问令牌，并搭配有效的 ID 令牌，从而绕过依赖 pac4j 角色验证的应用程序中的授权检查。

CVSS 8.1 · High

Affected Version Matrix 1

VendorProduct Version RangeStatus
pac4j pac4j < 6.5.6 affected
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I. Basic Information for CVE-2026-82461

Vulnerability Information
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Vulnerability Title
pac4j-oidc before 6.5.6 Privilege Escalation via Unverified Keycloak Access Token
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
pac4j pac4j 0 ~ 6.5.6 -

II. Public POCs for CVE-2026-82461

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III. Intelligence Information for CVE-2026-82461

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Vendor Advisories for CVE-2026-82461 (1)

Security Blog Posts for CVE-2026-82461 (1)

Same Patch Batch · pac4j · 2026-08-29 · 5 CVEs total

CVE-2026-82463 8.1 HIGH pac4j-core before 6.5.6 Authorization Bypass via Reversed Profile Type Check
CVE-2026-82462 6.5 MEDIUM pac4j-oidc before 6.5.6 Authentication Bypass via Access Token Substitution
CVE-2026-82464 6.1 MEDIUM pac4j-core before 6.5.6 Open Redirect via Backslash Logout
CVE-2026-82465 5.3 MEDIUM pac4j-saml before 6.5.6 Session Destruction via Unsigned LogoutRequest

IV. Related Vulnerabilities

Same product: pac4j
Same vendor: pac4j
Same weakness: CWE-347

V. Comments for CVE-2026-82461

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