Is CVE-2026-116889 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-116889 being exploited in the wild.

How severe is CVE-2026-116889?

Medium severity, with a CVSS score of 6.1, published 27 October 2026.

Which products and versions are affected?

Semantic MediaWiki SemanticMediaWiki 2.5.0 to 7.3.0.

Is there a fix for CVE-2026-116889?

Yes: fixed in 7.3.1. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-116889 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-116889?

Check whether you run Semantic MediaWiki SemanticMediaWiki 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.

CVE-2026-116889: SemanticMediaWiki stored cross-site scripting in Special:Browse

CVE-2026-116889 · Severity: medium · CVSS 6.1 · Published 2026-10-27

SemanticMediaWiki is an extension for MediaWiki that adds semantic annotation and browsing capabilities to wiki pages. A stored cross-site scripting flaw allows any user with page-edit rights to inject malicious JavaScript that executes in the browsers of other users—including administrators—when they view annotated content. An attacker can exploit this to steal session tokens, read sensitive data, or perform actions as the victim user.

Vendors: Semantic MediaWiki.

Quick answers

Is CVE-2026-116889 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-116889 being exploited in the wild.
How severe is CVE-2026-116889?: Medium severity, with a CVSS score of 6.1, published 27 October 2026.
Which products and versions are affected?: Semantic MediaWiki SemanticMediaWiki 2.5.0 to 7.3.0.
Is there a fix for CVE-2026-116889?: Yes: fixed in 7.3.1. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-116889 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-116889?: Check whether you run Semantic MediaWiki SemanticMediaWiki 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: 7.3.1

Technical details

The CodeStringValueFormatter in SemanticMediaWiki fails to HTML-escape property values of type "Code" when rendering them on the Special:Browse page. When a value is valid JSON starting with "{", the formatter routes it through a JSON pretty-printer that uses json_encode without the JSON_HEX_TAG flag, allowing "<" and ">" to pass through unescaped into the HTML output. The result is rendered via an unescaped Mustache template field, enabling arbitrary HTML and JavaScript injection by any user with page-edit rights.

Affected products

Semantic MediaWiki SemanticMediaWiki 2.5.0 to 7.3.0

Timeline

2026-09-28: disclosed
2026-10-27: advisory

References

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.