CVE-2024-54142: Cross-site Scripting via Discourse-ai SharedAiConversation onebox in Discourse

Severity: critical (CVSS 9.0 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-01-14 · updated 2026-06-17
Weakness: CWE-79

Description

Discourse AI is a Discourse plugin which provides a number of AI features. When sharing Discourse AI Bot conversations into posts, if the conversation had HTML entities those could leak into the Discourse application when a user visited a post with a onebox to said conversation. This issue has been addressed in commit `92f122c`. Users are advised to update. Users unable to update may remove all groups from `ai bot public sharing allowed groups` site setting.

Affected products

discourse-ai: before 92f122c

References

https://github.com/discourse/discourse-ai/commit/92f122c54d9d7ead9223a056270bff5b4c42c73f
https://github.com/discourse/discourse-ai/security/advisories/GHSA-94c2-qr2h-88jv

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