CVE-2026-40458
Description
PAC4J is vulnerable to Cross-Site Request Forgery (CSRF). A malicious attacker can craft a specially designed website which, when visited by a user, will automatically submit a forged cross-site request with a token whose hash collides with the victim's legitimate CSRF token. Importantly, the attacker does not need to know the victim’s CSRF token or its hash prior to the attack. Collisions in the deterministic String.hashCode() function can be computed directly, reducing the effective token's security space to 32 bits. This bypasses CSRF protection, allowing profile updates, password changes, account linking, and any other state-changing operations to be performed without the victim's consent.
This issue was fixed in PAC4J versions 5.7.10 and 6.4.1
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
org.pac4j:pac4j-coreMaven | < 5.7.10 | 5.7.10 |
org.pac4j:pac4j-coreMaven | >= 6.0.0-RC1, < 6.4.1 | 6.4.1 |
Affected products
3- osv-coords3 versions
< 36.0.0-r15+ 2 more
- (no CPE)range: < 36.0.0-r15
- (no CPE)range: < 36.0.0-r15
- (no CPE)range: < 5.7.10
Patches
Vulnerability mechanics
References
5- cert.pl/en/posts/2026/04/CVE-2026-40458/nvdThird Party Advisory
- github.com/advisories/GHSA-xw5c-jc7x-gf75ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-40458ghsaADVISORY
- www.pac4j.org/blog/security-advisory-pac4j-core-and-ldap.htmlnvdVendor AdvisoryWEB
- cert.pl/en/posts/2026/04/CVE-2026-40458ghsaWEB
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