[io.jenkins.plugins:markdown-formatter] XSS vulnerability in Jenkins Markdown Formatter Plugin

Markdown Formatter Plugin 0.1.0 and earlier uses a Markdown library to parse Markdown that does not escape crafted link target URLs.

This results in a stored cross-site scripting (XSS) vulnerability exploitable by attackers with the ability to edit any description rendered using the configured markup formatter.

Markdown Formatter Plugin 0.2.0 uses a different Markdown library that is not affected by this problem.

References

• https://nvd.nist.gov/vuln/detail/CVE-2021-21660
• 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://github.com/advisories/GHSA-xqpp-26pp-2365