# CVE-2025-64528

## Summary

- **CVE ID:** CVE-2025-64528
- **Severity:** MEDIUM
- **CVSS Score:** 6.3 (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)
- **CWE:** CWE-202
- **Published:** Dec 30, 2025
- **Last Modified:** Mar 12, 2026

## 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.

## Affected Products

- discourse — discourse (< 3.5.3)
- discourse — discourse (>= 2025.11.0-latest, < 2025.11.1)
- discourse — discourse (>= 2025.12.0-latest, < 2025.12.0)

## References

- [CNA](https://github.com/discourse/discourse/security/advisories/GHSA-c59w-jwx7-34v4)
- [CNA](https://github.com/discourse/discourse/commit/1cb45b8b287597085e3514596ffb1d9b41938f81)
- [CNA](https://github.com/discourse/discourse/commit/6192f55629624925595dae14364fd86cac0f09df)
- [CNA](https://github.com/discourse/discourse/commit/e936a523b5900a9d866d23ea3da904ba12bb0fb2)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.28%
- **EPSS Percentile:** 20.7

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._