CVE-2026-39935

MEDIUM EPSS 20.9%

Published Apr 7, 20262mo ago · Modified Jun 17, 20262w ago

6.9 CVSS 4.0

Medium

Published Apr 7, 2026 2mo ago

Last Modified Jun 17, 2026 2w ago

Description

Improper neutralization of input during web page generation ('cross-site scripting') vulnerability in The Wikimedia Foundation Mediawiki - CampaignEvents Extension allows Cross-Site Scripting (XSS). This issue was remediated only on the `master` branch.

CVSS Details

Base Score

6.9

Exploitability

—

Impact

—

Vector string

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector Network

Attack Complexity Low

Privileges Required None

User Interaction None

Scope X

Threat Intelligence

EPSS Exploit Probability

20.9% percentile

Exploit & Patch Status

No Known Exploit

No Patch Available

Weaknesses 1

CWE-79 Cross-site Scripting Injection

References 2

gerrit.wikimedia.org https://gerrit.wikimedia.org/r/c/1249320
phabricator.wikimedia.org https://phabricator.wikimedia.org/T418254

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.