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CVE-2021-35197

HIGH
7.5
CVSS Score
Published: July 2, 2021 at 12:28 PM UTC
Updated: June 17, 2026 at 03:57 AM UTC
3 products affected across 3 vendorsDebian LinuxFedoraMediaWiki

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Severity
HIGH7.5
Exploit prediction
EPSS 2%

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).

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Debian Linux· Debiandrupal
95%
10.011.09.0
Fedora· Fedora Projectrpm
95%
333435
MediaWiki· Mediawiki
95%
v < 1.31.151.32.0 ≤ v < 1.35.31.36.0 ≤ v < 1.36.1
Affected range stops below 1.31.15, so it looks safe — our inference, not a vendor statement
Affected range stops below 1.35.3, so it looks safe — our inference, not a vendor statement
Affected range stops below 1.36.1, so it looks safe — our inference, not a vendor statement

References (8)

Mailing Listx_refsource_MLISTThird Party Advisory
Source: [email protected]
https://lists.debian.org/debian-lts-announce/2021/10/msg00003.html
Vendor Advisoryx_refsource_FEDORA
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CJDYJQWT43GBD6GNQ4OW7JOZ6WQ6DZTN/
Vendor Advisoryx_refsource_FEDORA
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MDBPECBWN6LWNSWIQMVXK6PP4YFEUYHA/
Vendor Advisoryx_refsource_FEDORA
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QNEAI2T3Y65I55ZB6UE6RMC662RZTGRX/
x_refsource_CONFIRM
Source: [email protected]
https://lists.wikimedia.org/hyperkitty/list/mediawiki-announce%40lists.wikimedia.org/thread/YR3X4L2CPSEJVSY543AWEO65TD6APXHP/
x_refsource_MISCExploitVendor Advisory
Source: [email protected]
https://phabricator.wikimedia.org/T280226
Vendor Advisoryx_refsource_GENTOOThird Party Advisory
Source: [email protected]
https://security.gentoo.org/glsa/202107-40
Vendor Advisoryx_refsource_DEBIANThird Party Advisory
Source: [email protected]
https://www.debian.org/security/2021/dsa-4979

CVSS

7.5HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-863

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