XSS in Gnu Mailman

CVE-2021-43331

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

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.013 (67.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

Affected products

Gnu Mailman
Debian Debian_linux — versions 9.0
N/a — versions n/a

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

ARPSyndicate/cvemon

References

cve@mitre.org (Patch, Third Party Advisory, x_refsource_MISC, Issue Tracking)
cve@mitre.org (x_refsource_CONFIRM)
cve@mitre.org (mailing-list, x_refsource_MLIST, Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2021-43331?: CVE-2021-43331 is a medium-severity vulnerability in Gnu Mailman, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-11-12.
How severe is CVE-2021-43331?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2021-43331 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.