CVE-2026-27934CWE-201

Discourse leaks private topic title and post excerpt via user action API endpoint

High · published March 19, 2026

CVSS v4.0
8.7
EPSS
1%
Percentile
72.9
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
8.7 · HIGH
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
EPSS
0.01434 · 72.9th percentile
Weakness
CWE-201 · Insertion of Sensitive Information Into Sent Data
Published
2026-03-19T21:17Z
EPSS history
Timeline
  • 19 MAR 21:17Z
    Discourse leaks private topic title and post excerpt via user action API endpoint
    cvelistv5