Vulnerability in Discourse
CVE-2026-27935
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.005 (38.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 38th percentile — 38.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.005 · change: +0.002
Affected products
- Discourse — versions = 2026.3.0-latest, >= 2026.2.0-latest, < 2026.2.1, >= 2026.1.0-latest, < 2026.1.2
Weakness classification (CWE)
References
- github.com/discourse/discourse/security/advisories/GHSA-wxqr-r4wv-cw76 (Vendor Advisory)
- github.com/discourse/discourse/commit/c0f6e9a903800de0dda65c114418ae703d8a51fc (Patch)
- github.com/discourse/discourse/commit/d8dbb4cb189cded8c9e8b3ada859fc0db3f41897 (Patch)
- github.com/discourse/discourse/commit/f37e4fdf8391e4a54f1885a3a5514d390eb28bab (Patch)
Frequently asked questions
- What is CVE-2026-27935?
- CVE-2026-27935 is a medium-severity vulnerability in Discourse, classified under Insertion of Sensitive Information into Sent Data. CVSS score: 6.5/10. Published 2026-03-19.
- How severe is CVE-2026-27935?
- Medium severity. CVSS v3 base score is 6.5 out of 10.