# CVE-2026-116887: Semantic MediaWiki stored XSS in Special:Browse via Keyword property

Source: https://junglewise.ai/threats/cve-2026-116887-semantic-mediawiki-from-3-0-0-before-7-3-1-contains-a-stored  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-27. Updated: 2026-10-27  
License: CC BY 4.0 with a link back

CVE-2026-116887 · Severity: medium · CVSS 5.4 · Published 2026-10-27

Semantic MediaWiki is a structured data extension for wikis that allows users to annotate pages with typed properties. A stored cross-site scripting vulnerability in the Special:Browse page allows any user with page-editing rights to inject malicious JavaScript through Keyword-typed property values. When other users—including administrators—view the affected page, the injected script executes in their browser session, potentially allowing attackers to steal session tokens, read private data, or perform unauthorized actions as those users.

Technologies: [Semantic MediaWiki](https://junglewise.ai/threats/technologies/semantic-mediawiki). Vendors: [Semantic MediaWiki](https://junglewise.ai/threats/vendors/semantic-mediawiki).

## Quick answers

**Is CVE-2026-116887 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-116887 being exploited in the wild.

**How severe is CVE-2026-116887?** Medium severity, with a CVSS score of 5.4, published 27 October 2026.

**Which products and versions are affected?** Semantic MediaWiki 3.0.0 before 7.3.1.

**Is there a fix for CVE-2026-116887?** 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-2026-116887 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-116887?** Check whether you run 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 7.3.1

## Technical details

The KeywordValue class in Semantic MediaWiki overrides getShortHTMLText() and getLongHTMLText() methods without delegating to the base StringValueFormatter, which normally applies HTML encoding. As a result, Keyword property values are rendered verbatim on the Special:Browse page without HTML escaping, even when they contain event-handler markup. An attacker with page-edit rights can annotate a property with a payload like <img src=x onerror=alert()>, and this will execute in the browser of any viewer, including administrators.

## Affected products

- Semantic MediaWiki Semantic MediaWiki 3.0.0 before 7.3.1

## Timeline

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

## References

- [https://github.com/SemanticMediaWiki/SemanticMediaWiki/security/advisories/GHSA-r7xx-9gqh-q8p9](https://github.com/SemanticMediaWiki/SemanticMediaWiki/security/advisories/GHSA-r7xx-9gqh-q8p9)
- [https://www.vulncheck.com/advisories/semantic-mediawiki-3.0.0-before-7.3.1-stored-xss-via-special-browse-keyword-property](https://www.vulncheck.com/advisories/semantic-mediawiki-3.0.0-before-7.3.1-stored-xss-via-special-browse-keyword-property)

## Related threats

- [Semantic MediaWiki authorization bypass in edit protection](https://junglewise.ai/threats/cve-2026-126566-semantic-mediawiki-7-3-1-before-7-4-1-contains-an-incorrect)
- [Semantic MediaWiki denial of service in concept expansion](https://junglewise.ai/threats/cve-2026-126565-semantic-mediawiki-3-0-0-before-7-4-1-contains-a-denial-of)
- [Semantic MediaWiki stored XSS in ValueFormatter property label](https://junglewise.ai/threats/cve-2026-126564-semantic-mediawiki-2-5-0-before-7-4-1-contains-a-stored-cross)
- [Semantic MediaWiki uncontrolled recursion in ConceptDescriptionInterpreter](https://junglewise.ai/threats/cve-2026-126562-semantic-mediawiki-3-0-0-before-7-4-1-contains-an-uncontrolled)
- [Semantic MediaWiki missing authorization in page edit protection](https://junglewise.ai/threats/cve-2026-126561-semantic-mediawiki-2-5-0-before-7-4-1-contains-a-missing)