What is CVE-2017-0366?

CVE-2017-0366 is a medium-severity vulnerability in MediaWiki, classified under Improper Input Validation. CVSS score: 5.4/10. Published 2018-04-13.

How severe is CVE-2017-0366?

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

Improper input validation in MediaWiki

CVE-2017-0366

Mediawiki before 1.28.1 / 1.27.2 / 1.23.16 contains a flaw allowing to evade SVG filter using default attribute values in DTD declaration.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2018-04-13 · 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:N/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.013 (69.4th percentile), scored 2026-10-07.

Low probability of exploitation in the next 30 days, but still tracked. 69th percentile — 69.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: -0.000

Affected products

MediaWiki
Debian Linux — versions 7.0

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

lists.wikimedia.org/pipermail/mediawiki-announce/2017-April/000207.html (Vendor Advisory, mailing-list)
phabricator.wikimedia.org/T151735 (Exploit, Third Party Advisory, Issue Tracking)
security-tracker.debian.org/tracker/CVE-2017-0366 (Third Party Advisory)

Frequently asked questions

What is CVE-2017-0366?: CVE-2017-0366 is a medium-severity vulnerability in MediaWiki, classified under Improper Input Validation. CVSS score: 5.4/10. Published 2018-04-13.
How severe is CVE-2017-0366?: Medium severity. CVSS v3 base score is 5.4 out of 10.