What’s Vulnerable › Vulnerabilities
CVE-2026-53440
- Severity: medium (CVSS 4.3 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-06-10 · updated 2026-10-26
- Weakness: CWE-601
Description
Jenkins 2.567 and earlier, LTS 2.555.2 and earlier does not ensure that the "from" parameter in the "Delegate to servlet container" security realm is safe to redirect to after login, allowing attackers to perform phishing attacks by redirecting users to an attacker-controlled domain.
Affected products
- Jenkins: before 2.555.3; before 2.568 — fixed in 2.555.3, 2.568
How to fix
Upgrade to a fixed version: Jenkins 2.555.3, 2.568. Check the vendor advisory for mitigations.
References
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