CVE-2026-39838 | Wikimedia ProofreadPage Extension up to 1.43.6/1.44.3/1.45.1 on MediaWiki cross site scripting

VDB-355964 · CVE-2026-39838 · GCVE-0-2026-39838 WIKIMEDIA PROOFREADPAGE EXTENSION UP TO 1.43.6/1.44.3/1.45.1 ON MEDIAWIKI CROSS SITE SCRIPTING HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 4.1 $0-$5k 2.65 Summaryinfo A vulnerability classified as problematic was found in Wikimedia ProofreadPage Extension up to 1.43.6/1.44.3/1.45.1 on MediaWiki. This issue affects some unknown processing. Such manipulation leads to cross site scripting. This vulnerability is traded as CVE-2026-39838. The attack may be launched remotely. There is no exploit available. Upgrading the affected component is advised. Detailsinfo A vulnerability was found in Wikimedia ProofreadPage Extension up to 1.43.6/1.44.3/1.45.1 on MediaWiki and classified as problematic. Affected by this issue is an unknown function. The manipulation with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. Impacted is integrity. CVE summarizes: Improper neutralization of input during web page generation ('cross-site scripting') vulnerability in Wikimedia Foundation MediaWiki - ProofreadPage Extension allows XSS Targeting Non-Script Elements.This issue affects . The weakness was shared by SomeRandomDeveloper. The advisory is shared for download at phabricator.wikimedia.org. This vulnerability is handled as CVE-2026-39838 since 04/07/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1059.007. Upgrading to version 1.43.7, 1.44.4 or 1.45.2 eliminates this vulnerability. Productinfo Type Content Management System Vendor Wikimedia Name ProofreadPage Extension Version 1.43.0 1.43.1 1.43.2 1.43.3 1.43.4 1.43.5 1.43.6 1.44.0 1.44.1 1.44.2 1.44.3 1.45.0 1.45.1 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: 4.3 VulDB Meta Temp Score: 4.1 VulDB Base Score: 4.3 VulDB Temp Score: 4.1 VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Cross site scripting CWE: CWE-79 / CWE-94 / CWE-74 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: ProofreadPage Extension 1.43.7/1.44.4/1.45.2 Timelineinfo 04/07/2026 Advisory disclosed 04/07/2026 +0 days CVE reserved 04/07/2026 +0 days VulDB entry created 04/07/2026 +0 days VulDB entry last update Sourcesinfo Advisory: phabricator.wikimedia.org Researcher: SomeRandomDeveloper Status: Confirmed CVE: CVE-2026-39838 (🔒) GCVE (CVE): GCVE-0-2026-39838 GCVE (VulDB): GCVE-100-355964 Entryinfo Created: 04/07/2026 23:37 Changes: 04/07/2026 23:37 (69) Complete: 🔍 Cache ID: 99:939:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸