Is CVE-2026-84302 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-84302 being exploited in the wild.

How severe is CVE-2026-84302?

Medium severity, with a CVSS score of 4.2, published 24 September 2026.

Which products and versions are affected?

Discourse prior to 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0.

Is there a fix for CVE-2026-84302?

A patch was published on 2026-01-06: version 2026.1.6 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-84302 attacked?

It is attacked over the network, in a web application.

Am I affected by CVE-2026-84302?

Check whether you run Discourse at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-84302: Discourse AI access control bypass in private message reviewables

CVE-2026-84302 · Severity: medium · CVSS 4.2 · Published 2026-09-24

Discourse is an open-source discussion platform used to host community forums and private conversations. A flaw in its AI-powered moderation review system could allow a moderator to view private messages they were not a participant in, and potentially modify or delete content from those conversations. The vulnerability requires an authenticated moderator account and a pre-existing moderation review associated with a private message to exploit.

Technologies: Discourse. Vendors: Discourse.

Quick answers

Is CVE-2026-84302 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-84302 being exploited in the wild.
How severe is CVE-2026-84302?: Medium severity, with a CVSS score of 4.2, published 24 September 2026.
Which products and versions are affected?: Discourse prior to 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0.
Is there a fix for CVE-2026-84302?: A patch was published on 2026-01-06: version 2026.1.6 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-84302 attacked?: It is attacked over the network, in a web application.
Am I affected by CVE-2026-84302?: Check whether you run Discourse at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

The vulnerability is an access control bypass in the reviewable visibility filtering logic for private-message-associated AI reviewables. The viewable_by method failed to restrict private-message reviewables to the audience permitted to access the underlying topic, allowing any moderator to see and potentially act upon reviewables they should not have access to. Exploitation requires an authenticated moderator account and a pre-existing Discourse AI reviewable tied to a private message; the attack vector is network-based through the web interface.

Affected products

Discourse Discourse prior to 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0

Timeline

2026-09-24: disclosed
2026-01-06: patched: version 2026.1.6
2026-05-02: patched: version 2026.5.2
2026-06-01: patched: version 2026.6.1
2026-07-00: patched: version 2026.7.0

References

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