CVE-2026-84302 Discourse: Non-participant moderators can read, edit, and delete PM content through Discourse AI reviewables
Non-participant moderators can read, edit, and delete private message content via Discourse AI reviewables due to missing visibility checks.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-84302?
CVE-2026-84302 is a medium-severity missing authorization vulnerability in discourse, published on 24 Sep 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Official description
Discourse is an open-source discussion platform. Prior to 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0, Discourse AI reviewables associated with private messages could appear in the moderator review queue of a moderator who was not a participant in the message. Reviewable visibility filtering did not restrict private-message reviewables to the audience permitted to access the underlying private-message topic, allowing the moderator to read otherwise confidential content. Depending on the available reviewable action, the moderator could also modify the private message by closing its topic or deleting a post. Exploitation requires an authenticated moderator account and a pre-existing Discourse AI reviewable associated with a private message. This issue is fixed in versions 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0.
Weakness: CWE-862
Which versions are affected by CVE-2026-84302?
1 open source package ship an affected version, including discourse.
| Package | Affected | Fixed in |
|---|---|---|
discourse Bitnami | All versions | 2026.7.0 |
How do I fix CVE-2026-84302?
Upgrade discourse to 2026.7.0 or later.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-84302 being exploited?
There is no known exploitation of CVE-2026-84302 in the wild and no public exploit code.
Sources
Also known as BIT-discourse-2026-84302, GHSA-3rx9-fqgh-wfpc.