CVE-2026-27935

MEDIUM

Discourse leaks private topic metadata to non-authorized users

Title source: cna
STIX 2.1

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 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.

References (4)

Core 4

Scores

CVSS v4 6.9
EPSS 0.0027
EPSS Percentile 18.3%
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-201
Status published
Products (3)
discourse/discourse = 2026.3.0-latest
discourse/discourse >= 2026.1.0-latest, < 2026.1.2
discourse/discourse >= 2026.2.0-latest, < 2026.2.1
Published Mar 19, 2026
Tracked Since Mar 20, 2026