CVE-2025-64528

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 v3.1 Score

5.3

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Weakness Type (CWE)

CWE-202 CWE-202

Affected Products

Vendor	Product	Versions
discourse	discourse	< 3.5.3
discourse	discourse	All
discourse	discourse	All

References

Advisories & Patches

https://github.com/discourse/discourse/commit/1cb45b8b287597085e3514596ffb1d9b41938f81 https://github.com/discourse/discourse/commit/6192f55629624925595dae14364fd86cac0f09df https://github.com/discourse/discourse/commit/e936a523b5900a9d866d23ea3da904ba12bb0fb2

Other References

https://github.com/discourse/discourse/security/advisories/GHSA-c59w-jwx7-34v4

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2025-64528? +

CVE-2025-64528 has a CVSS v3.1 score of 5.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-64528? +

CVE-2025-64528 affects products from discourse, specifically: discourse. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-64528? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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