CVE-2026-126563
Semantic MediaWiki 2.4.0 before 7.4.1 Reflected XSS via Special:Ask Date Format
Description
Semantic MediaWiki 2.4.0 before 7.4.1 contains a reflected cross-site scripting vulnerability in TimeValueFormatter::getCaptionFromFreeFormat(), which emits free-format date captions in HTML without escaping. Unauthenticated attackers can craft a Special:Ask URL with HTML markup in a date printout format (#-F[...]) to execute script in a logged-in victim's browser session.
INFO
Published Date :
Nov. 11, 2026, 2:35 a.m.
Last Modified :
Nov. 11, 2026, 2:35 a.m.
Remotely Exploit :
Yes !
Source :
VulnCheck
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 3.1 | MEDIUM | MITRE-CVE | ||||
| CVSS 4.0 | MEDIUM | 83251b91-4cc7-4094-a5c7-464a1b83ea10 |
Solution
- Update Semantic MediaWiki to version 7.4.1 or later.
- Apply vendor-supplied security patches.
- Sanitize all user-supplied input for date formats.
- Escape HTML in date captions.
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CVE-2026-126563 vulnerability anywhere in the article.