Vulnerability in Discourse
CVE-2025-64528
Discourse is an open source discussion platform. Prior to versions 3.5.3, 2025.11.1, and 2025.12.0, an attacker who knows part of a username can find the user and their full name via UI or API, even when `enable_names` is disabled. Versions 3.5.3, 2025.11.1, and 2025.12.0 contain a fix.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.003 (19.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 19th percentile — 19.3% 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: 0.003 · change: +0.000
Affected products
- Discourse — versions >= 2025.11.0-latest, < 2025.11.1, 2025.12.0, 2025.11.0
Weakness classification (CWE)
References
- github.com/discourse/discourse/security/advisories/GHSA-c59w-jwx7-34v4 (Third Party Advisory)
- github.com/discourse/discourse/commit/1cb45b8b287597085e3514596ffb1d9b41938f81 (Patch)
- github.com/discourse/discourse/commit/6192f55629624925595dae14364fd86cac0f09df (Patch)
- github.com/discourse/discourse/commit/e936a523b5900a9d866d23ea3da904ba12bb0fb2 (Patch)
Frequently asked questions
- What is CVE-2025-64528?
- CVE-2025-64528 is a medium-severity vulnerability in Discourse, classified under CWE-202. CVSS score: 5.3/10. Published 2025-12-30.
- How severe is CVE-2025-64528?
- Medium severity. CVSS v3 base score is 5.3 out of 10.