Open Redirect Vulnerability in Jenkins by Jenkins
CVE-2026-53440

4.3MEDIUM

Key Information:

Vendor

Jenkins
Status
Jenkins
Vendor
CVE Published:
10 June 2026

What is CVE-2026-53440?

The open redirect vulnerability in Jenkins versions 2.567 and earlier, including LTS 2.555.2 and earlier, arises from the insufficient validation of the 'from' parameter in the 'Delegate to servlet container' security realm. This flaw allows attackers to redirect unsuspecting users to malicious domains post-login, making them susceptible to phishing attacks. Users are encouraged to update their Jenkins installations to mitigate potential risks.

Affected Version(s)

Jenkins 2.568

Jenkins 2.568

Jenkins 2.555.3 < 2.555.*

References

https://www.jenkins.io/security/advisory/2026-06-10/#SECU...
vendor-advisory

CVSS V3.1

Score:
4.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.