CVE-2021-35197 json
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.
published 2021-07-02 5 y ago modified 2026-06-17 4 mo ago also BIT-mediawiki-2021-35197 , EUVD-2021-21841
- cvss
- 7.5
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.9%
- EPSS 1.9% chance of exploitation in 30 days, percentile 80%
- public exploits
- 0
- none known
Summary
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).
Patch / fix
- bitnami mediawiki 1.31.15, 1.35.3, 1.36.1
- mediawiki mediawiki 1.31.15, 1.35.3, 1.36.1
- mediawiki Debian 14, Debian 13, Debian 12 1:1.35.3-1
debian advisories DEBIAN-CVE-2021-35197
- mediawiki Arch Linux 1.36.1-1
arch linux advisories AVG-2093
Vendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
red hat product security vex CVE-2021-35197 updated cvss 7.5
mediawiki: blocked users are able to purge pages impacting Integrity
-
Red Hat OpenShift Container Platform 3.11 mediawiki Red Hat OpenShift Container Platform 4 mediawikiaffected: no fix planned “Out of support scope”
Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf
Exploit prediction
1.94% chance of exploitation in the next 30 days, higher than 80% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- phabricator.wikimedia.org https://phabricator.wikimedia.org/T280226 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:N/I:P/A:N |
| OSV | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| bitnami | mediawiki | <1.31.15 >=1.32.0, <1.35.3 >=1.36.0, <1.36.1 |
1.31.15 1.35.3 1.36.1 |
Classification
- Weakness
-
- CWE-863 Incorrect Authorization
References
-
phabricator.wikimedia.org
/T280226
exploit, vendor-advisory, web
-
security.gentoo.org
/glsa/202107-40
vendor-advisory, third-party-advisory, web
-
debian.org
/security/2021/dsa-4979
vendor-advisory, third-party-advisory, web
-
lists.fedoraproject.org
/archives/list/package-announce%40lists.fedoraproject.org/message/QNEAI2T3Y65I55ZB6UE6RMC662RZTGRX/
vendor-advisory, web
-
lists.fedoraproject.org
/archives/list/package-announce%40lists.fedoraproject.org/message/CJDYJQWT43GBD6GNQ4OW7JOZ6WQ6DZTN/
vendor-advisory, web
-
lists.fedoraproject.org
/archives/list/package-announce%40lists.fedoraproject.org/message/MDBPECBWN6LWNSWIQMVXK6PP4YFEUYHA/
vendor-advisory, web
-
lists.wikimedia.org
/hyperkitty/list/mediawiki-announce%40lists.wikimedia.org/thread/YR3X4L2CPSEJVSY543AWEO65TD6APXHP/
web
-
lists.debian.org
/debian-lts-announce/2021/10/msg00003.html
mailing-list, third-party-advisory, web
-
nvd.nist.gov
/vuln/detail/CVE-2021-35197
web
Sources
- CVE List CVE-2021-35197
- NVD CVE-2021-35197
- OSV BIT-mediawiki-2021-35197
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