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CVE-2021-30156

MEDIUM
4.3
CVSS Score
Published: April 9, 2021 at 06:10 AM UTC
Updated: June 17, 2026 at 03:49 AM UTC
2 products affected across 2 vendorsFedoraMediaWiki

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Severity
MEDIUM4.3
Exploit prediction
EPSS 1%

Description

An issue was discovered in MediaWiki before 1.31.12 and 1.32.x through 1.35.x before 1.35.2. Special:Contributions can leak that a "hidden" user exists.

Affected

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

Fedora· Fedora Projectrpm
95%
3334
MediaWiki· Mediawiki
95%
v < 1.31.121.32.0 ≤ v < 1.35.2
Affected range stops below 1.31.12, so it looks safe — our inference, not a vendor statement
Affected range stops below 1.35.2, so it looks safe — our inference, not a vendor statement

References (3)

Vendor Advisoryx_refsource_FEDORA
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/26UJGHF7LJDOCQN6A3Z4PM7PYRKENJHE/
Vendor Advisoryx_refsource_FEDORA
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2OMSV7B2TCFBOCICN3B4SMQP5HVRJQIT/
x_refsource_MISCExploitPatchVendor Advisory
Source: [email protected]
https://phabricator.wikimedia.org/T276306

CVSS

4.3MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-200

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