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    CVE-2026-29000

    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.

    Published:Mar 4, 2026
    Last Modified:Apr 16, 2026
    EPS:Mar 4, 2026
    EPSS Score:0.00057
    CVSS Score:9.1

    Affected Products

    Vendor
    Pac4j
    Product
    Pac4j

    Exploits

    https://github.com/0xW1LD/CVE-2026-29000https://github.com/alihussainzada/CVE-2026-29000-Python-PoC-pac4j-JWT-AuthenticationBypass-Pochttps://github.com/c0gnit00/CVE-2026-29000https://github.com/cipher1x1/CVE-2026-29000https://github.com/ClayOfGilgamesh/CVE-2026-29000https://github.com/Crims-on/CVE-2026-29000https://github.com/dua2z3rr/CVE-2026-29000-PoChttps://github.com/Gajraj238/CVE-2026-29000https://github.com/jake-young-dev/CVE-2026-29000https://github.com/kernelzeroday/CVE-2026-29000https://github.com/ledksv/Principal-HackTheBoxhttps://github.com/lucastran05/CVE-2026-29000https://github.com/manbahadurthapa1248/CVE-2026-29000---pac4j-jwt-Authentication-Bypass-PoChttps://github.com/oil-lamp-cat/CVE-2026-29000-pac4j-PoChttps://github.com/otuva/CVE-2026-29000https://github.com/PtechAmanja/CVE-2026-29000-pac4j-jwt-auth-bypasshttps://github.com/rootdirective-sec/CVE-2026-29000-Labhttps://github.com/RootX111/cve-2026-29000https://github.com/Strikoder-Premium/CVE-2026-29000-pac4j-jwthttps://github.com/tc4dy/CVE-2026-29000-PoC-Exploithttps://github.com/xiaoqiMikko/pac4j-checkhttps://github.com/yasirr10/CVE-2026-29000https://github.com/zF-tm/CVE-2026-29000

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-463 Padding Oracle Crypto Attack
    CAPEC-475 Signature Spoofing by Improper Validation

    Related CVEs

    CVE-2026-82465 (CVSS 6.9) — pac4j-saml before 6.5.6 does not require signature validation of SAML LogoutRequest messages in SAML2LogoutVal…
    CVE-2026-82464 (CVSS 5.3) — pac4j-core before 6.5.6 contains an open redirect vulnerability in DefaultLogoutLogic.perform() that accepts b…
    CVE-2026-82463 (CVSS 8.6) — pac4j-core before 6.5.6 contains an authentication bypass vulnerability in CheckProfileTypeAuthorizer that rev…
    CVE-2026-82462 (CVSS 6.9) — pac4j-oidc before 6.5.6 accepts OIDC callbacks carrying only an access token without authorization code or ID …
    CVE-2026-82461 (CVSS 8.6) — pac4j-oidc before 6.5.6 fails to verify access token signatures, issuers, audiences, or expiry when extracting…
    CVE-2026-40459 (CVSS 8.7) — PAC4J is vulnerable to LDAP Injection in multiple methods. A low-privileged remote attacker can inject crafted…
    CVE-2026-40458 (CVSS 7) — PAC4J is vulnerable to Cross-Site Request Forgery (CSRF). A malicious attacker can craft a specially designed …
    CVE-2023-25581 (CVSS 9.2) — pac4j is a security framework for Java. `pac4j-core` prior to version 4.0.0 is affected by a Java deserializat…
    CVE-2021-44878 (CVSS 7.5) — If an OpenID Connect provider supports the "none" algorithm (i.e., tokens with no signature), pac4j v5.3.0 (an…
    CVE-2019-10755 (CVSS 4.9) — The SAML identifier generated within SAML2Utils.java was found to make use of the apache commons-lang3 RandomS…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High