← Vulnerability feed

Vulnerability record · CVE-2023-37303 · published 30 June 2023

CVE-2023-37303: Mediawiki vulnerability

Mediawiki · Mediawiki

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.

9.8 CVSS 3.1 Critical EPSS 0.95% · top 40.2% CWE-754 · CWE-754
9.8CVSS 3.1 base score
0.95%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://gerrit.wikimedia.org/r/q/I10a9273c542576b3f7bb38de68dcd2aa41cfb1b0 Vendor Advisory
https://phabricator.wikimedia.org/T338276 ExploitIssue TrackingPatchVendor Advisory
https://gerrit.wikimedia.org/r/q/I10a9273c542576b3f7bb38de68dcd2aa41cfb1b0 Vendor Advisory
https://phabricator.wikimedia.org/T338276 ExploitIssue TrackingPatchVendor Advisory

Track CVE-2023-37303 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2024-34502Mediawiki cross-site request forgery vulnerabilityAn issue was discovered in WikibaseLexeme in MediaWiki before 1.39.6, 1.40.x before 1.40.2, and 1.41.x before 1.41.1. Loading Special:MergeLexemes wi…EPSS 0.41%9.8CVE-2023-29141Mediawiki http request smuggling vulnerabilityAn issue was discovered in MediaWiki before 1.35.10, 1.36.x through 1.38.x before 1.38.6, and 1.39.x before 1.39.3. An auto-block can occur for an un…EPSS 1.2%9.8CVE-2022-29904Mediawiki sql injection vulnerabilityThe SemanticDrilldown extension for MediaWiki through 1.37.2 (before e688bdba6434591b5dff689a45e4d53459954773) allows SQL injection with certain '-' …EPSS 17%9.8CVE-2022-29906Mediawiki missing authorization vulnerabilityThe admin API module in the QuizGame extension for MediaWiki through 1.37.2 (before 665e33a68f6fa1167df99c0aa18ed0157cdf9f66) omits a check for the q…EPSS 1.3%9.8CVE-2022-28205Mediawiki vulnerabilityAn issue was discovered in MediaWiki through 1.37.1. The CentralAuth extension mishandles a ttl issue for groups expiring in the future.EPSS 1.5%9.8CVE-2022-28206Mediawiki vulnerabilityAn issue was discovered in MediaWiki through 1.37.1. ImportPlanValidator.php in the FileImporter extension mishandles the check for edit rights.EPSS 1.5%9.8CVE-2022-28209Mediawiki vulnerabilityAn issue was discovered in Mediawiki through 1.37.1. The check for the override-antispoof permission in the AntiSpoof extension is incorrect.EPSS 1.3%9.8CVE-2021-31556Mediawiki vulnerabilityAn issue was discovered in the Oauth extension for MediaWiki through 1.35.2. MWOAuthConsumerSubmitControl.php does not ensure that the length of an R…EPSS 1.6%

Source: NIST National Vulnerability Database (record CVE-2023-37303), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.