Quick answers
- Is CVE-2026-126563 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-126563 being exploited in the wild.
- How severe is CVE-2026-126563?
- Medium severity, with a CVSS score of 6.1, published 11 November 2026.
- Which products and versions are affected?
- SemanticMediaWiki Semantic MediaWiki 2.4.0 before 7.4.1.
- Is there a fix for CVE-2026-126563?
- Yes: fixed in 7.4.1. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-126563 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-126563?
- Check whether you run SemanticMediaWiki Semantic MediaWiki at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
How to fix
- Fixed in: 7.4.1
Technical details
A reflected cross-site scripting vulnerability exists in the TimeValueFormatter::getCaptionFromFreeFormat() method, which emits free-format date captions in HTML output without escaping user-supplied format strings. Attackers craft Special:Ask URLs with HTML markup in the date printout format parameter (#-F[...]) to inject script that executes in the victim's authenticated browser session. The vulnerability is fixed by escaping the caption when rendered as HTML while preserving raw output for non-HTML formats.
Affected products
- SemanticMediaWiki Semantic MediaWiki 2.4.0 before 7.4.1
Timeline
- 2026-11-11: disclosed