TI-2021-04753 Aliases CVE-2021-21673 GHSA-2vvr-5757-qp87

Open redirect in Jenkins CAS Plugin

LOW 30CWE-601Published 2021-06-30 · Updated 2024-08-03

Key facts

Attack vector: Network
Privileges required: None
User interaction: Required
Attack complexity: Low
Impact type: Spoofing
Confidentiality · integrity · availability: Low · Low · None
Fix status: Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-601.

Summary

Jenkins CAS Plugin 1.6.0 and earlier improperly determines that a redirect URL after login is legitimately pointing to Jenkins, allowing attackers to perform phishing attacks.

Why it matters now

EPSS 0.01584 75th percentileScored 2026-11-07

Fix Fixed org.jenkins-ci.plugins:cas-plugin (Maven): 1.6.1

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Jenkins	Jenkins CAS Plugin	up to 1.6.0	—	No fix listed	CNA
—	org.jenkins-ci.plugins:cas-plugin (Maven)	before 1.6.1	1.6.1	Patch available	GHSA-2vvr-5757-qp87

Jenkins CAS Plugin VendorJenkins Affected up to 1.6.0 Fixed in — No fix listed CNA
org.jenkins-ci.plugins:cas-plugin (Maven) Vendor— Affected before 1.6.1 Fixed in 1.6.1 Patch available GHSA-2vvr-5757-qp87

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:jenkins:cas::::::jenkins::*	up to 1.6.0	Vulnerable	Jenkins

cpe:2.3:a:jenkins:cas:*:*:*:*:*:jenkins:*:* Versions up to 1.6.0 Vulnerable ·Jenkins

Remediation

Fix · GHSA-2vvr-5757-qp87 org.jenkins-ci.plugins:cas-plugin (Maven) Fixed in 1.6.1 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2021-21673
2026-10-03 Alias added: GHSA-2vvr-5757-qp87

References

Advisory 3

Other 2

TI-2023-16185 Jenkins CAS Plugin 1.6.2 and earlier does not invalidate the previous session on login. CVSS 3.1HIGH 8.8
TI-2018-15837 A server-side request forgery vulnerability exists in Jenkins CAS Plugin 1.4.1 and older… CVSS 3.0MEDIUM 5.4

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences