Wikimedia CentralAuth Extension up to 1.43.6/1.44.3/1.45.1 on Mediawiki removal of sensitive information

CVSS Meta Temp Score
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CTI Interest Score
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7.0$0-$5k0.00

Summaryinfo

A vulnerability marked as critical has been reported in Wikimedia CentralAuth Extension up to 1.43.6/1.44.3/1.45.1 on Mediawiki. The impacted element is an unknown function. Performing a manipulation results in removal of sensitive information. This vulnerability is cataloged as CVE-2026-39937. It is possible to initiate the attack remotely. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in Wikimedia CentralAuth Extension up to 1.43.6/1.44.3/1.45.1 on Mediawiki. This affects an unknown code. The manipulation with an unknown input leads to a removal of sensitive information vulnerability. CWE is classifying the issue as CWE-212. The product stores, transfers, or shares a resource that contains sensitive information, but it does not properly remove that information before the product makes the resource available to unauthorized actors. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Improper removal of sensitive information before storage or transfer vulnerability in The Wikimedia Foundation Mediawiki - CentralAuth Extension allows Resource Leak Exposure. The issue has been remediated on the `master` branch, and in the release branches for MediaWiki versions 1.43, 1.44, and 1.45.

The weakness was shared by Urbanecm. The advisory is shared at phabricator.wikimedia.org. This vulnerability is uniquely identified as CVE-2026-39937 since 04/07/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1592 for this issue.

Upgrading to version 1.43.7, 1.44.4 or 1.45.2 eliminates this vulnerability.

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Productinfo

Type

Vendor

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 7.0

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Removal of sensitive information
CWE: CWE-212 / CWE-200 / CWE-284
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: CentralAuth Extension 1.43.7/1.44.4/1.45.2

Timelineinfo

04/07/2026 CVE reserved
04/08/2026 +1 days Advisory disclosed
04/08/2026 +0 days VulDB entry created
07/22/2026 +105 days VulDB entry last update

Sourcesinfo

Advisory: phabricator.wikimedia.org
Researcher: Urbanecm
Status: Confirmed

CVE: CVE-2026-39937 (🔒)
GCVE (CVE): GCVE-0-2026-39937
GCVE (VulDB): GCVE-100-355989

Entryinfo

Created: 04/08/2026 07:47
Updated: 07/22/2026 11:20
Changes: 04/08/2026 07:47 (68), 07/22/2026 11:20 (2)
Complete: 🔍
Cache ID: 216::103

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