CVE-2021-44857

MEDIUM
6.5
CVSS Score
Published: December 17, 2021 at 12:00 AM UTC
Updated: June 17, 2026 at 04:12 AM UTC
1 product affected across 1 vendorMediaWiki

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Severity
MEDIUM6.5
Exploit prediction
EPSS 0.9%

Description

An issue was discovered in MediaWiki before 1.35.5, 1.36.x before 1.36.3, and 1.37.x before 1.37.1. It is possible to use action=mcrundo followed by action=mcrrestore to replace the content of any arbitrary page (that the user doesn't have edit rights for). This applies to any public wiki, or a private wiki that has at least one page set in $wgWhitelistRead.

Affected

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

v < 1.35.51.36.0 ≤ v < 1.36.31.37.0 ≤ v < 1.37.1
Affected range stops below 1.35.5, so it looks safe — our inference, not a vendor statement
Affected range stops below 1.36.3, so it looks safe — our inference, not a vendor statement
Affected range stops below 1.37.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-862

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