CVE-2026-44785

Discourse: Hidden reply-to post raw can be disclosed through AI explain prompts

State: Published
Severity: 4.3 Medium
Published: Jun 12, 2026
Updated: Jun 15, 2026
Reserved: May 7, 2026

Description

Discourse is an open-source discussion platform. From versions 2026.1.0-latest to before 2026.1.4, 2026.3.0-latest to before 2026.3.1, and 2026.4.0-latest to before 2026.4.1, the AI "explain" helper only checks can_see? on the post being explained, not its reply_to_post, so any authenticated user with access to the AI helper could read the raw contents of a hidden parent post by invoking "Explain" on a reply to it. This issue has been patched in versions 2026.1.4, 2026.3.1, 2026.4.1, and 2026.5.0-latest.1.

Scores

CVSS	Score	Vector	Source
3.1	4.3 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N	GitHub_M

Weaknesses

CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

Affected Products

Product	Versions
discoursediscourse	>= 2026.1.0-latest, < 2026.1.4Affected >= 2026.3.0-latest, < 2026.3.1Affected >= 2026.4.0-latest, < 2026.4.1Affected

References

https://github.com/discourse/discourse/security/advisories/GHSA-7h76-fwxc-j586

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