CVE-2026-39933 | Wikimedia GlobalWatchlist Extension up to 1.43.6/1.44.3/1.45.1 on Mediawiki cross site scripting

VDB-356012 · CVE-2026-39933 · GCVE-0-2026-39933 WIKIMEDIA GLOBALWATCHLIST 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 0.58+ Summaryinfo A vulnerability was found in Wikimedia GlobalWatchlist Extension up to 1.43.6/1.44.3/1.45.1 on Mediawiki. It has been declared as problematic. This affects an unknown function. Such manipulation leads to cross site scripting. This vulnerability is uniquely identified as CVE-2026-39933. The attack can be launched remotely. No exploit exists. It is recommended to upgrade the affected component. Detailsinfo A vulnerability was found in Wikimedia GlobalWatchlist Extension up to 1.43.6/1.44.3/1.45.1 on Mediawiki. It has been rated as problematic. Affected by this issue is some unknown processing. 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 The Wikimedia Foundation Mediawiki - GlobalWatchlist Extension allows Cross-Site Scripting (XSS).This issue affects non release branches. The weakness was disclosed by SomeRandomDeveloper. The advisory is shared for download at phabricator.wikimedia.org. This vulnerability is handled as CVE-2026-39933 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 GlobalWatchlist 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: GlobalWatchlist 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 04/08/2026 +0 days VulDB entry last update Sourcesinfo Advisory: phabricator.wikimedia.org Researcher: SomeRandomDeveloper Status: Confirmed CVE: CVE-2026-39933 (🔒) GCVE (CVE): GCVE-0-2026-39933 GCVE (VulDB): GCVE-100-356012 Entryinfo Created: 04/08/2026 08:02 Changes: 04/08/2026 08:02 (69) Complete: 🔍 Cache ID: 99:7F0:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸