Unrated severityNVD Advisory· Published Mar 19, 2026· Updated Mar 24, 2026
Discourse Vulnerable to Stored XSS via Shared AI Conversation Onebox
CVE-2026-27570
Description
Discourse is an open-source discussion platform. Prior to versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2, the onebox method in the SharedAiConversation model renders the conversation title directly into HTML without proper sanitization. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch. As a workaround, tighten access by changing the ai_bot_public_sharing_allowed_groups site setting.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
3< 2026.3.0-latest.1, < 2026.2.1, < 2026.1.2+ 1 more
- (no CPE)range: < 2026.3.0-latest.1, < 2026.2.1, < 2026.1.2
- (no CPE)range: >= 2026.1.0-latest, < 2026.1.2
Patches
Vulnerability mechanics
References
4- github.com/discourse/discourse/commit/43a5a60b595f0120e6adfc131f2408508fe341f1mitrex_refsource_MISC
- github.com/discourse/discourse/commit/c14f8f52b7999328bd9f8665f2ecfa24dadc4bf1mitrex_refsource_MISC
- github.com/discourse/discourse/commit/f2aafa5c7467c94fcd4ebd36785a98e77ca088ccmitrex_refsource_MISC
- github.com/discourse/discourse/security/advisories/GHSA-hfxw-89hw-vwmvmitrex_refsource_CONFIRM
News mentions
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