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Critical Pac4j CVEs

2 CVEs, 1 protected by Waratek

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Product pac4j✕
Overview 2 matches · 1 protected · 0 exploited · 0 CISA KEV · 1 public PoC · 0 EPSS ≥ 0.5
2matches 1protected50.0% 0exploited0.0% 0CISA KEV0.0% 1public PoC50.0% 0EPSS ≥ 0.50.0%
Protected by Waratek 1 50.0% Rule in development 0 0.0% Mitigation candidate 1 50.0% No exploit published 0 0.0%
Critical 2 100.0% High 0 0.0% Medium 0 0.0% Low 0 0.0% None 0 0.0% Unknown 0 0.0%
blocked by ARMR today 1 50.0% partly blocked 0 0.0% not blocked 1 50.0% not established 0 0.0% unrecorded 0 0.0%
Exploited 0 0.0% Working exploit published 0 0.0% Proof of concept only 2 100.0% Forecast only 0 0.0% No public exploit 0 0.0%
split by peak 1 / month
Mitigation candidate: 1Protected by Waratek: 1 Critical: 2 not blocked: 1blocked by ARMR today: 1 Proof of concept only: 2
Oct 241 Protected by Waratek1 Critical1 blocked by ARMR today1 Proof of concept only1 Nov 240 Dec 240 Jan 250 Feb 250 Mar 250 Apr 250 May 250 Jun 250 Jul 250 Aug 250 Sep 250 Oct 250 Nov 250 Dec 250 Jan 260 Feb 260 Mar 261 Mitigation candidate1 Critical1 not blocked1 Proof of concept only1
Nov 24Jan 25Mar 25May 25Jul 25Sep 25Nov 25Jan 26Mar 26
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CVE Severity Published▾ Status Exploitation Description
CVE-2026-29000 Critical 2026-03-04 Mitigation candidate Proof of concept only 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.
CVE-2023-25581 Critical 2024-10-10 Protected by Waratek Proof of concept only pac4j is a security framework for Java. `pac4j-core` prior to version 4.0.0 is affected by a Java deserialization vulnerability. The vulnerability affects systems that store externally controlled values in attributes of the `UserProfile` class from pac4j-core. It can be exploited by providing an attribute that contains a serialized Java object with a special prefix `{#sb64}` and Base64 encoding. This issue may lead to Remote Code Execution (RCE) in the worst case. Although a `RestrictedObjectInputStream` is in place, that puts some restriction on what classes can be deserialized, it still allows a broad range of java packages and potentially exploitable with different gadget chains. pac4j versions 4.0.0 and greater are not affected by this issue. Users are advised to upgrade. There are no known workarounds for this vulnerability.