Discourse Private Topic Metadata Disclosure via API (Before 2026.3.0-latest.1)
CVE-2026-27935 Published on March 19, 2026
Discourse leaks private topic metadata to non-authorized users
Discourse is an open-source discussion platform. Versions prior to 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 have a vulnerability in an API endpoint that discloses private topic metadata of admin users to moderator users even if the moderators do not have access to the private topics. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch. No known workarounds are available.
Weakness Type
Insertion of Sensitive Information Into Sent Data
The code transmits data to another actor, but a portion of the data includes sensitive information that should not be accessible to that actor. Sensitive information could include data that is sensitive in and of itself (such as credentials or private messages), or otherwise useful in the further exploitation of the system (such as internal file system structure).
Products Associated with CVE-2026-27935
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Affected Versions
discourse:- Version >= 2026.1.0-latest, < 2026.1.2 is affected.
- Version >= 2026.2.0-latest, < 2026.2.1 is affected.
- Version = 2026.3.0-latest is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.