Application Level Denial of Service Vulnerability in Discourse by Discourse
CVE-2025-68659

4.3MEDIUM

Key Information:

Vendor

Discourse
Status
Discourse
Vendor
CVE Published:
28 January 2026

What is CVE-2025-68659?

A vulnerability exists in Discourse, an open source discussion platform, prior to versions 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0, whereby an attacker can exploit the username change feature. By sending large JSON payloads to the username preference endpoint, malicious actors can induce significant server delays and exhaust server resources. This exploitation results in a degrading experience for legitimate users by slowing down server response and consuming system resources. The vulnerability has been patched in the specified versions, and no workarounds are available.

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Affected Version(s)

discourse < 3.5.4 < 3.5.4

discourse >= 2025.11.0-latest, < 2025.11.2 < 2025.11.0-latest, 2025.11.2

discourse >= 2025.12.0-latest, < 2025.12.1 < 2025.12.0-latest, 2025.12.1

References

https://github.com/discourse/discourse/security/advisorie...
x_refsource_CONFIRM

CVSS V3.1

Score:
4.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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