CVE-2026-44785 PUBLISHED

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

Assigner: GitHub_M
Reserved: 07.05.2026 Published: 12.06.2026 Updated: 12.06.2026

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.

Metrics

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

Product Status

Vendor discourse
Product discourse
Versions
  • Version >= 2026.1.0-latest, < 2026.1.4 is affected
  • Version >= 2026.3.0-latest, < 2026.3.1 is affected
  • Version >= 2026.4.0-latest, < 2026.4.1 is affected

References

Problem Types

  • CWE-200: Exposure of Sensitive Information to an Unauthorized Actor CWE