CVE-2026-53437
Jenkins 2.567 and earlier, LTS 2.555.2 and earlier improperly determines that a redirect URL after login is legitimately pointing to Jenkins when it contains tab or newline characters between //, allowing attackers to perform phishing attacks.
CSIRTS triage
- What
- This advisory addresses multiple vulnerabilities in Jenkins Core.
- Who is affected
- Deployments of Jenkins Core are affected.
- Urgency
- Remediation is necessary, but the severity is currently unknown.
- Action
- Update to the latest version of Jenkins Core.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Low exploitation risk0.36% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 30% of all EPSS-scored CVEs.
Advisory coverage (2)
- mediumGHSA-463r-5m89-4xfr: Jenkins Open Redirect Through Newline/Tab Characters in Redirect URLghsa · 2026-06-10
- unknownJenkins Security Advisory 2026-06-10jenkins · 2026-06-10
External references
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[](https://www.csirts.com/cve/CVE-2026-53437)