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.

EPSS: 0.002 (15.5th percentile) — read the EPSS interpretation.

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.

Affected products

  • Discourse — versions >= 2025.11.0-latest, < 2025.11.1, 2025.12.0, 2025.11.0

Weakness classification (CWE)

References

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.