CVE-2026-29000
pac4j-jwt JwtAuthenticator Authentication Bypass
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.
INFO
Published Date :
March 4, 2026, 10:16 p.m.
Last Modified :
April 16, 2026, 4:18 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | CRITICAL | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 3.1 | CRITICAL | [email protected] | ||||
| CVSS 3.1 | CRITICAL | MITRE-CVE | ||||
| CVSS 3.1 | CRITICAL | [email protected] | ||||
| CVSS 4.0 | CRITICAL | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 4.0 | CRITICAL | [email protected] | ||||
| CVSS 4.0 | CRITICAL | [email protected] |
Solution
- Update pac4j-jwt to version 4.5.9 or later.
- Update pac4j-jwt to version 5.7.9 or later.
- Update pac4j-jwt to version 6.3.3 or later.
Public PoC/Exploit Available at Github
CVE-2026-29000 has a 33 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-29000.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-29000 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-29000
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
🚀 CVE-2026-24061 - GNU inetutils-telnetd Auth Bypass Exploit - Full Control 💥 CRLF injection via NEW_ENVIRON leads to auth bypass & instant root shell. ✅ Single/Mass exploitation, multi-threading, custom port/user, pipe mode, session keep-alive, colored output, retries, timeout support. ⚡ Python & Bash versions. Critical CVSS 9.8.
Python Shell
None
Dockerfile Java PowerShell Shell Batchfile Python Bru
Python POC, Exploit for CVE-2026-29000
Python
None
None
Dockerfile JavaScript Python HTML CSS Shell Java
🚀 CVE-2026-0073 - Android ADB Wireless Debugging Exploit (CVSS 8.8) 🔓 Zero-click authentication bypass via TLS type confusion. Gain interactive shell, execute commands, scan networks. Educational red-team tool. 🐚⚡
Python
CVE-2026-29000 – pac4j-jwt Authentication Bypass (🔥 CVSS 10.0). One-click admin forge via public key JWE wrapping. Leaks configs, users, secrets. Keep-alive, proxy, custom JWKS.⚙️ Educational PoC Exploit tool.
Python
🚀 CVE-2026-41940 cPanel/WHM Auth Bypass Exploit - Best Flow 💥 CRLF injection leads to auth bypass, session hijacking & account leak. ✅ Proxy, custom UA, keep-alive, retries, SSL verify, colored output, file save support. ⚡ Advanced PoC for pentesters.
Python
None
Personal writeup of the Principal hack the box machine
Python
PoC of the CVE-2026-29000
Python
CVE-2026-29000 PoC: pac4j-jwt PlainJWT-in-JWE authentication bypass.
Python
An educational deep-dive into CVE-2026-29000
Python
HackTheBox Principal machine walkthrough — network scanning, directory enumeration and web application analysis
Python
Proof of Concept for CVE-2026-29000, a vulnerability in pac4j-jwt
Python
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-29000 vulnerability anywhere in the article.
-
Daily CyberSecurity
Critical 10.0 CVSS Flaw in pac4j-jwt Lets Hackers Forge Admin Tokens
Cybersecurity researchers have uncovered a critical vulnerability in pac4j-jwt, a popular Java-based library used to secure thousands of applications through JSON Web Tokens (JWT). The flaw, tracked a ... Read more
The following table lists the changes that have been made to the
CVE-2026-29000 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
Mar. 10, 2026
Action Type Old Value New Value Added CVSS V4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Removed CVSS V4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N Removed CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:L -
New CVE Received by [email protected]
Mar. 04, 2026
Action Type Old Value New Value Added 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. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:L Added CWE CWE-347 Added Reference https://www.codeant.ai/security-research/pac4j-jwt-authentication-bypass-public-key Added Reference https://www.pac4j.org/blog/security-advisory-pac4j-jwt-jwtauthenticator.html Added Reference https://www.vulncheck.com/advisories/pac4j-jwt-jwtauthenticator-authentication-bypass