What’s Vulnerable › Vulnerabilities

CVE-2021-21660

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-05-25 · updated 2026-06-17
• Weakness: CWE-79

Description

Jenkins Markdown Formatter Plugin 0.1.0 and earlier does not sanitize crafted link target URLs, resulting in a stored cross-site scripting (XSS) vulnerability exploitable by attackers with the ability to edit any description rendered using the configured markup formatter.

Affected products

• Jenkins project Jenkins Markdown Formatter Plugin: through 0.1.0

References

• http://www.openwall.com/lists/oss-security/2021/05/25/3
• https://www.jenkins.io/security/advisory/2021-05-25/#SECURITY-2198
• https://www.whitesourcesoftware.com/vulnerability-database/CVE-2021-21660
• http://www.openwall.com/lists/oss-security/2021/05/25/3
• https://www.jenkins.io/security/advisory/2021-05-25/#SECURITY-2198
• https://www.whitesourcesoftware.com/vulnerability-database/CVE-2021-21660

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