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Critical Jenkins Vulnerability Exposes Build Environments to XSS Attacks

Cybersecuritynews •Abinaya • February 20, 2026

Security Advisory has revealed multiple vulnerabilities in Jenkins Core, including a stored Cross-Site Scripting (XSS) flaw that could expose build environments to severe security risks. The issues, identified as CVE-2026-27099 and CVE-2026-27100, were responsibly disclosed under the Jenkins Bug Bounty Program by the European Commission. The most critical of the two, tracked as CVE-2026-27099, is a high-severity stored XSS vulnerability that impacts […]

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This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

Critical Jenkins Vulnerability Exposes Build Environments to XSS Attacks A critical stored Cross-Site Scripting (XSS) vulnerability has been identified in Jenkins Core, affecting build environments. The vulnerabilities, tracked as CVE-2026-27099 and CVE-2026-27100, were disclosed by the European Commission under the Jenkins Bug Bounty Program. CVE-2026-27099 is classified as high-severity and poses significant security risks to users. 2 sources 47

Extracted Entities

Critical Jenkins Vulnerability Exposes Build Environments to XSS Attacks

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Extracted Entities

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Vulnerabilities (1)