CVE-2026-44785CWE-200

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

Medium · published June 12, 2026

CVSS v3.1
4.3
EPSS
0%
Percentile
23.7
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
4.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00319 · 23.7th percentile
Weakness
CWE-200 · Exposure of Sensitive Information to an Unauthorized Actor
Published
2026-06-12T20:24Z
EPSS history
Timeline
  • 12 JUN 20:24Z
    Discourse: Hidden reply-to post raw can be disclosed through AI explain prompts
    cvelistv5