No exploitation reportedFix available

CVE-2021-35197

Q: Is CVE-2021-35197 actively exploited?

Active exploitation of CVE-2021-35197 has not been confirmed. Its EPSS score was 1.9% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2021-35197?

CVE-2021-35197 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

No exploitation reported by the sources we read.

Published2021-07-02
Fixed in1.36.1 · 1.35.3 · 1.31.15
WeaknessCWE-863

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

In MediaWiki before 1.31.15, 1.32.x through 1.35.x before 1.35.3, and 1.36.x before 1.36.1, bots have certain unintended API access. When a bot account has a "sitewide block" applied, it is able to still "purge" pages through the MediaWiki Action API (which a "sitewide block" should have prevented).

Timeline

dates in UTC

2021-07-0213:15CVE publishedNVD

Versions per branch

NVD · OSV

Mediawiki

Branch	Affected	Fixed in	Source
1.36	≥ 1.36.0, < 1.36.1	1.36.1	NVD · OSV
1.x	≥ 1.32.0, < 1.35.3	1.35.3	NVD · OSV
1.31	< 1.31.15	1.31.15	NVD · OSV

Debian debian linux

Branch	Affected	Fixed in	Source
9.0	= 9.0	no fix published	NVD
10.0	= 10.0	no fix published	NVD
11.0	= 11.0	no fix published	NVD

Fedoraproject fedora

Branch	Affected	Fixed in	Source
33.x	= 33	no fix published	NVD
34.x	= 34	no fix published	NVD
35.x	= 35	no fix published	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

mediawikiUbuntu:Pro:24.04:LTSall versions · no fixed version listed
mediawikiUbuntu:Pro:22.04:LTSall versions · no fixed version listed
mediawikiUbuntu:Pro:20.04:LTSall versions · no fixed version listed
mediawikiUbuntu:26.10all versions · no fixed version listed
mediawikiUbuntu:26.04:LTSall versions · no fixed version listed
mediawikiUbuntu:25.10all versions · no fixed version listed
mediawikiUbuntu:18.04:LTSall versions · no fixed version listed
mediawikiMageia:8all versions · fixed in 1.35.3-1.1.mga8

7 more package ranges on OSV.dev

Vendor advisories

CVE-2021-35197 Red Hat Product Security6 known affected
mediawiki: blocked users are able to purge pages impacting Integrity
mediawiki as a component of Red Hat OpenShift Container Platform 3.11 · mediawiki-doc as a component of Red Hat OpenShift Container Platform 3.11 · mediawiki.src as a component of Red Hat OpenShift Container Platform 3.11 · +3 more

Full record on NVD

Fix

Update Mediawiki to 1.36.1 · 1.35.3 · 1.31.15
No fix planned, says the vendor Red Hat Product Security CVE-2021-35197 · 6 productsOut of support scope

Advisories and patches

phabricator.wikimedia.orgVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof of concept: PoC-in-GitHubno public repository identifiedread 2026-11-08
Metasploit modules: none listed

Sources

NVDCVSS 3.17.5read 2026-10-23
NVDCVSS 2.05read 2026-10-23
NVDweakness (CWE)CWE-863read 2026-10-23
FIRST EPSSEPSS score1.9 %2026-11-08
OSVaffected packages—
GitHub Advisoriesadvisory—

Identifiers

BIT-mediawiki-2021-35197same flawBitnami · Apache-2.0
EUVD-2021-21841same flawENISA EUVD · LicenseRef-ENISA-legal-notice
GHSA-8hhg-q8jv-q9c7same flawGitHub Advisory Database · CC-BY-4.0
DLA-2779-1advisory covering several CVEsDebian · LicenseRef-unstated
DSA-4979-1advisory covering several CVEsDebian · LicenseRef-unstated
MGASA-2021-0346advisory covering several CVEsMageia · LicenseRef-unstated

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Published: 2021-07-02
Last Modified: 2026-06-17
NVD status: Modified
GitHub Advisory: GHSA-8hhg-q8jv-q9c7

Frequently asked questions

What is CVE-2021-35197?

Is CVE-2021-35197 actively exploited?

Active exploitation of CVE-2021-35197 has not been confirmed. Its EPSS score was 1.9% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-35197?

CVE-2021-35197 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

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