What is CVE-2018-0618?

CVE-2018-0618 is a medium-severity vulnerability in GNU Mailman, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2018-07-26.

How severe is CVE-2018-0618?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in GNU Mailman

CVE-2018-0618

Cross-site scripting vulnerability in Mailman 2.1.26 and earlier allows remote authenticated attackers to inject arbitrary web script or HTML via unspecified vectors.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2018-07-26 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.020 (80.4th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 80th percentile — 80.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.020 · newest: 0.020 · change: 0.000

Affected products

GNU Mailman
GNU Mailman — versions 2.1.26 and earlier
Debian Linux — versions 8.0, 9.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

mail.python.org/pipermail/mailman-announce/2018-June/000236.html (mailing-list, Mailing List)
www.debian.org/security/2018/dsa-4246 (vendor-advisory, Third Party Advisory)
lists.debian.org/debian-lts-announce/2018/07/msg00034.html (mailing-list, Mailing List, Third Party Advisory)
jvn.jp/en/jp/JVN00846677/index.html (Third Party Advisory, third-party-advisory)
security.gentoo.org/glsa/201904-10 (vendor-advisory, Third Party Advisory)
usn.ubuntu.com/4348-1/ (vendor-advisory)

Frequently asked questions

What is CVE-2018-0618?: CVE-2018-0618 is a medium-severity vulnerability in GNU Mailman, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2018-07-26.
How severe is CVE-2018-0618?: Medium severity. CVSS v3 base score is 5.4 out of 10.