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CVE-2026-29000— pac4j-jwt JwtAuthenticator Authentication Bypass

Quick assessment

Affected
pac4j pac4j-jwt
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-jwt是pac4j开源的一个JWT认证模块。 pac4j-jwt 4.5.9之前版本、5.7.9之前版本和6.3.3之前版本存在数据伪造问题漏洞，该漏洞源于JwtAuthenticator在处理加密JWT时存在身份验证绕过问题，可能导致远程攻击者利用服务器的RSA公钥伪造身份验证令牌，从而以包括管理员在内的任何用户身份通过验证。

CVSS 9.1 · Critical EPSS 0.50% · P41

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 3

VendorProduct Version RangeStatus
pac4j pac4j-jwt 4.0< 4.5.9 affected
5.0< 5.7.9 affected
6.0< 6.3.3 affected
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I. Basic Information for CVE-2026-29000

Vulnerability Information
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Vulnerability Title
pac4j-jwt JwtAuthenticator Authentication Bypass
Source: CVE Program / CVE List V5
Vulnerability Description
pac4j-jwt versions prior to 4.5.9, 5.7.9, and 6.3.3 contain an authentication bypass vulnerability in JwtAuthenticator when processing encrypted JWTs that allows remote attackers to forge authentication tokens. Attackers who possess the server's RSA public key can create a JWE-wrapped PlainJWT with arbitrary subject and role claims, bypassing signature verification to authenticate as any user including administrators.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/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
Vulnerability Title
pac4j-jwt 数据伪造问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
pac4j-jwt是pac4j开源的一个JWT认证模块。 pac4j-jwt 4.5.9之前版本、5.7.9之前版本和6.3.3之前版本存在数据伪造问题漏洞，该漏洞源于JwtAuthenticator在处理加密JWT时存在身份验证绕过问题，可能导致远程攻击者利用服务器的RSA公钥伪造身份验证令牌，从而以包括管理员在内的任何用户身份通过验证。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
pac4j pac4j-jwt 4.0 ~ 4.5.9 -

II. Public POCs for CVE-2026-29000

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III. Intelligence Information for CVE-2026-29000

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Proof of Concept for CVE-2026-29000 (1)

Security Blog Posts for CVE-2026-29000 (1)

News Coverage for CVE-2026-29000 (1)

IV. Related Vulnerabilities

Same vendor: pac4j
Same weakness: CWE-347

V. Comments for CVE-2026-29000

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