CVE-2026-39837 | Wikimedia Cargo Extension up to 3.8.6 on Mediawiki cross site scripting

VDB-355947 · CVE-2026-39837 · GCVE-0-2026-39837 WIKIMEDIA CARGO EXTENSION UP TO 3.8.6 ON MEDIAWIKI CROSS SITE SCRIPTING HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 3.4 $0-$5k 1.27 Summaryinfo A vulnerability marked as problematic has been reported in Wikimedia Cargo Extension up to 3.8.6 on Mediawiki. This impacts an unknown function. Performing a manipulation results in cross site scripting. This vulnerability is reported as CVE-2026-39837. The attack is possible to be carried out remotely. No exploit exists. It is suggested to upgrade the affected component. Detailsinfo A vulnerability was found in Wikimedia Cargo Extension up to 3.8.6 on Mediawiki. It has been classified as problematic. This affects an unknown code. The manipulation with an unknown input leads to a cross site scripting vulnerability. CWE is classifying the issue as CWE-80. The product receives input from an upstream component, but it does not neutralize or incorrectly neutralizes special characters such as "<", ">", and "&" that could be interpreted as web-scripting elements when they are sent to a downstream component that processes web pages. This is going to have an impact on integrity. The summary by CVE is: Improper neutralization of Script-Related HTML tags in a web page (basic XSS) vulnerability in WikiWorks Mediawiki - Cargo Extension allows Stored XSS.This issue affects Mediawiki - Cargo Extension: before 3.8.7. The weakness was disclosed by SomeRandomDeveloper. It is possible to read the advisory at phabricator.wikimedia.org. This vulnerability is uniquely identified as CVE-2026-39837 since 04/07/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK. Upgrading to version 3.8.7 eliminates this vulnerability. Productinfo Type Content Management System Vendor Wikimedia Name Cargo Extension Version 3.8.0 3.8.1 3.8.2 3.8.3 3.8.4 3.8.5 3.8.6 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: 3.5 VulDB Meta Temp Score: 3.4 VulDB Base Score: 3.5 VulDB Temp Score: 3.4 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-80 / CWE-74 / CWE-707 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: Cargo Extension 3.8.7 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-2026-39837 (🔒) GCVE (CVE): GCVE-0-2026-39837 GCVE (VulDB): GCVE-100-355947 Entryinfo Created: 04/07/2026 23:32 Changes: 04/07/2026 23:32 (69) Complete: 🔍 Cache ID: 99:627:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸