CVE-2025-64528
Users are able to find users by name even when `enable_names` is off
EPSS 0.03%
Description
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.
How to fix CVE-2025-64528
To remediate CVE-2025-64528, upgrade the affected package to a fixed version below.
- Bitnami/discourse—upgrade to 3.5.3 or later
Is CVE-2025-64528 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 0, < 3.5.3, >= 2025.11.0, < 2025.11.1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
References (5)
- WEBgithub.com/discourse/discourse/commit/1cb45b8b287597085e3514596ffb1d9b41938f81
- WEBgithub.com/discourse/discourse/commit/6192f55629624925595dae14364fd86cac0f09df
- WEBgithub.com/discourse/discourse/commit/e936a523b5900a9d866d23ea3da904ba12bb0fb2
- WEBgithub.com/discourse/discourse/security/advisories/GHSA-c59w-jwx7-34v4