CVE-2026-29000

Published Mar 4, 2026

Last updated 14 days ago

CVSS critical 9.3
Jwt
API

Overview

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
disclosure@vulncheck.com
NVD status
Deferred

Risk scores

CVSS 4.0

Type
Secondary
Base score
9.3
Impact score
-
Exploitability score
-
Vector string
CVSS:4.0/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
Severity
CRITICAL

CVSS 3.1

Type
Primary
Base score
9.1
Impact score
5.2
Exploitability score
3.9
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Severity
CRITICAL

Weaknesses

disclosure@vulncheck.com
CWE-347

Social media

Hype score
Not currently trending

  1. 📌 ثغرة حرجة (CVSS 10.0) في pac4j-jwt أكتشف ثغرة حرجة ضمن مكتبة pac4j-jwt، وهي مكتبة Java واسعة الاستخدام لتأمين التطبيقات عبر رموز JSON Web Tokens (JWT). تُتيح هذه الثغرة،CVE-2026-2900

    @MisbarSec

    7 Mar 2026

    119 Impressions

    0 Retweets

    2 Likes

    0 Bookmarks

    0 Replies

    0 Quotes

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References

Sources include official advisories and independent security research.