CVE-2025-27625: jenkins Open Redirect — Fix

Description

In Jenkins 2.499 and earlier, LTS 2.492.1 and earlier, redirects starting with backslash (`\`) characters are considered safe, allowing attackers to perform phishing attacks by having users go to a Jenkins URL that will forward them to a different site, because browsers interpret these characters as part of scheme-relative redirects.

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CVSS v3.1 Score

4.3

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

Weakness Type (CWE)

CWE-601 CWE-601

Affected Products

Vendor	Product	Versions
jenkins	jenkins	< 2.492.2
jenkins	jenkins	< 2.500

References

Advisories & Patches

https://www.jenkins.io/security/advisory/2025-03-05/#SECURITY-3501

Frequently Asked Questions

What is CVE-2025-27625? +

In Jenkins 2.499 and earlier, LTS 2.492.1 and earlier, redirects starting with backslash (`\`) characters are considered safe, allowing attackers to perform phishing attacks by having users go to a Jenkins URL that will forward them to a different site, because browsers interpret these characters as part of scheme-relative redirects. It has a CVSS v3.1 base score of 4.3 (MEDIUM).

How severe is CVE-2025-27625? +

CVE-2025-27625 has a CVSS v3.1 score of 4.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-27625? +

CVE-2025-27625 affects products from jenkins, specifically: jenkins. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-27625? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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CVE-2025-27625