What is CVE-2021-36129?

CVE-2021-36129 is a medium-severity vulnerability in MediaWiki, classified under Incorrect Permission Assignment for Critical Resource. CVSS score: 4.3/10. Published 2021-07-02.

How severe is CVE-2021-36129?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Vulnerability in MediaWiki

CVE-2021-36129

An issue was discovered in the Translate extension in MediaWiki through 1.36. The Aggregategroups Action API module does not validate the parameter for aggregategroup when action=remove is set, thus allowing users with the translate-manage right to silently delete various groups' metadata.

Published 2021-07-02 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.006 (46.7th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 46.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

MediaWiki

Weakness classification (CWE)

CWE-732 — Incorrect Permission Assignment for Critical Resource

References

phabricator.wikimedia.org/T282932 (Exploit, Patch, Vendor Advisory)
gerrit.wikimedia.org/r/q/I3619a7e88c2eb979babb7b027d4fdbfabc0af792 (Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2021-36129?: CVE-2021-36129 is a medium-severity vulnerability in MediaWiki, classified under Incorrect Permission Assignment for Critical Resource. CVSS score: 4.3/10. Published 2021-07-02.
How severe is CVE-2021-36129?: Medium severity. CVSS v3 base score is 4.3 out of 10.