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Multiple Vulnerabilities in Jenkins

Indian – Computer Emergency Response Team (https://www.cert-in.org.in)

Severity Rating: HIGH

Software Affected

Jenkins weekly versions 2.567 and prior

Jenkins LTS versions 2.555.2 and prior

Overview

Multiple vulnerabilities have been reported in Jenkins, which could allow an attacker to achieve remote code execution, impersonate users, conduct phishing attacks via open redirects, bypass security restrictions, disclose sensitive information, and perform cross-site scripting attacks on the targeted system.

Target Audience:

All end-user organizations and individuals using Jenkins.

Risk Assessment:

High risk of remote code execution, security restriction bypass, information disclosure, and cross-site scripting.

Impact Assessment:

Potential for remote code execution, security restriction bypass, information disclosure, and cross-site scripting.

Description

Jenkins is an open-source automation server that helps teams automatically build, test, and deploy software as part of a CI/CD pipeline.

Multiple vulnerabilities exist in Jenkins due to improper deserialization restrictions, insufficient input validation in URL redirection logic, missing permission checks in various HTTP endpoints, improper handling of user-supplied offline cause descriptions, and insecure processing of config.xml submissions containing secrets. An attacker could exploit these vulnerabilities to deserialize arbitrary objects, impersonate users, perform unauthorized actions, read sensitive files, conduct phishing attacks through open redirects, inject malicious scripts, access restricted information, cancel queue items without proper authorization, and expose plaintext secrets on the targeted system.

Successful exploitation of these vulnerabilities could allow an attacker to achieve remote code execution, impersonate users, conduct phishing attacks via open redirects, bypass security restrictions, disclose sensitive information, and perform cross-site scripting attacks on the targeted system.

Solution

Apply appropriate updates as mentioned by the vendor:

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

Vendor Information

Jenkins

https://www.jenkins.io/

References

 

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

CVE Name

CVE-2026-53435

CVE-2026-53436

CVE-2026-53437

CVE-2026-53438

CVE-2026-53439

CVE-2026-53440

CVE-2026-53441

CVE-2026-53442

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Thanks and Regards,

CERT-In

Incident Response Help Desk

e-mail: incident@cert-in.org.in

Phone: +91-11-22902657

Toll Free Number: 1800-11-4949

Toll Free Fax : 1800-11-6969

Web: http://www.cert-in.org.in

PGP Fingerprint: A768 083E 4475 5725 B81A A379 2156 C0C0 B620 D0B4

PGP Key information:

https://www.cert-in.org.in/s2cMainServlet?pageid=CONTACTUS

Postal address:

Indian Computer Emergency Response Team (CERT-In)

Ministry of Electronics and Information Technology

Government of India

Electronics Niketan

6, C.G.O. Complex

New Delhi-110 003

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