CVE-2023-37303

CRITICAL

MediaWiki < 1.39.3 - Denial of Service via CheckUser Extension Block Attempt

Title source: llm

Description

An issue was discovered in the CheckUser extension for MediaWiki through 1.39.3. In certain situations, an attempt to block a user fails after a temporary browser hang and a DBQueryDisconnectedError error message.

References (2)

Core 2

Core References

Vendor Advisory

https://gerrit.wikimedia.org/r/q/I10a9273c542576b3f7bb38de68dcd2aa41cfb1b0

Exploit, Issue Tracking, Patch, Vendor Advisory

https://phabricator.wikimedia.org/T338276

Scores

CVSS v3 9.8

EPSS 0.0024

EPSS Percentile 47.5%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment

Exploitation poc

Automatable yes

Technical Impact total

Details

CWE

CWE-754

Status published

Products (1)

mediawiki/mediawiki < 1.39.3

Published Jun 30, 2023

Tracked Since Feb 18, 2026