Medium severity · published Dec 30, 2025
CVE-2025-64528
Users are able to find users by name even when `enable_names` is off
5.3
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 21% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
DI
discourse · discourse
< 3.5.3; >= 2025.11.0-latest, < 2025.11.1; >= 2025.12.0-latest, < 2025.12.0 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-64528
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-64528
Patch
https://github.com/discourse/discourse/commit/1cb45b8b287597085e3514596ffb1d9b41938f81
Patch
https://github.com/discourse/discourse/commit/6192f55629624925595dae14364fd86cac0f09df
Patch
https://github.com/discourse/discourse/commit/e936a523b5900a9d866d23ea3da904ba12bb0fb2
Third Party Advisory
https://github.com/discourse/discourse/security/advisories/GHSA-c59w-jwx7-34v4
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