Cross-site Request Forgery (CSRF) Affecting org.pac4j:pac4j-core package, versions [5.0.0-RC1,5.7.10)[6.0.0-RC1,6.4.1)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published19 Apr 2026
- disclosed17 Apr 2026
- creditBartłomiej Dmitruk
Introduced: 17 Apr 2026
CVE-2026-40458 (opens in a new tab)How to fix?
Upgrade org.pac4j:pac4j-core to version 5.7.10, 6.4.1 or higher.
Overview
org.pac4j:pac4j-core is a pac4j is an easy and powerful security engine for Java to authenticate users, get their profiles and manage authorizations in order to secure web applications and web services.
Affected versions of this package are vulnerable to Cross-site Request Forgery (CSRF) due to deterministic calculations in the String.hashCode() function. An attacker can perform unauthorized profile updates, password changes, account linking, and other state-changing actions by submitting a forged request with a token whose hash collides with the legitimate CSRF token. The attacker does not need to possess the legitimate token or its hash before the attack.