CVE-2026-27934 Discourse leaks private topic title and post excerpt via user action API endpoint
Attackers can view private topic titles and excerpts via an API endpoint lacking visibility checks, exposing sensitive data to unauthorized users.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-27934?
CVE-2026-27934 is a high-severity vulnerability in Discourse Discourse, published on 19 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Discourse is an open-source discussion platform. Versions prior to 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 have a lack of visibility checks with a user action API endpoint that results in disclosure of the title and post excerpt to unauthorized users, leading to information disclosure. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch. No known workarounds are available.
Weakness: CWE-201
Which versions are affected by CVE-2026-27934?
1 open source package ship an affected version, including discourse. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
discourse Bitnami | From 2026.1.0 | 2026.1.2, 2026.2.1, 2026.3.0 |
Products include Discourse Discourse.
How do I fix CVE-2026-27934?
Upgrade discourse to a fixed version for your release line: 2026.1.2, 2026.2.1 or 2026.3.0.
Is CVE-2026-27934 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-27934 exists.
Public exploit code: 1 Nuclei template.
Other vulnerabilities in Discourse Discourse
- CVE-2021-41163 RCE via malicious SNS subscription payload
- CVE-2022-36066 Discourse vulnerable to RCE via admins uploading maliciously zipped file
- CVE-2022-39356 Discourse user account takeover via email and invite link
- CVE-2023-22468 Discourse vulnerable to Cross-site Scripting in local oneboxes
- CVE-2025-48053 Discourse vulnerable to DoS via large URL payload in PM to a bot
Sources
Also known as BIT-discourse-2026-27934, GHSA-824f-66wh-xx3g.