What’s Vulnerable › Vulnerabilities

CVE-2021-43331

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-11-12 · updated 2026-06-17
• Weakness: CWE-79

Description

In GNU Mailman before 2.1.36, a crafted URL to the Cgi/options.py user options page can execute arbitrary JavaScript for XSS.

Affected products

• Debian Linux: 9.0
• GNU Mailman: before 2.1.36 — fixed in 2.1.36

How to fix

Upgrade to a fixed version: GNU Mailman 2.1.36. Check the vendor advisory for mitigations.

References

• https://bugs.launchpad.net/mailman/+bug/1949401
• https://lists.debian.org/debian-lts-announce/2022/06/msg00011.html
• https://mail.python.org/archives/list/mailman-announce%40python.org/message/I2X7PSFXIEPLM3UMKZMGOEO3UFYETGRL/
• https://bugs.launchpad.net/mailman/+bug/1949401
• https://lists.debian.org/debian-lts-announce/2022/06/msg00011.html
• https://mail.python.org/archives/list/mailman-announce%40python.org/message/I2X7PSFXIEPLM3UMKZMGOEO3UFYETGRL/

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