CVE-2025-68659
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2026-01-28

Last updated on: 2026-01-30

Assigner: GitHub, Inc.

Description
Discourse is an open source discussion platform. Versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0 have an application level denial of service vulnerabilityin the username change functionality at try.discourse.org. The vulnerability allows attackers to cause noticeable server delays and resource exhaustion by sending large JSON payloads to the username preference endpoint PUT /u//preferences/username, resulting in degraded performance for other users and endpoints. This issue is patched in versions 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0. No known workarounds are available.
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Meta Information
Published
2026-01-28
Last Modified
2026-01-30
Generated
2026-06-16
AI Q&A
2026-01-29
EPSS Evaluated
2026-06-15
NVD
CVE-2025-68659
EUVD
EUVD-2025-206425
Affected Vendors & Products
Showing 4 associated CPEs
Vendor Product Version / Range
discourse discourse to 3.5.4 (exc)
discourse discourse From 2025.11.0 (inc) to 2025.11.2 (exc)
discourse discourse 2025.12.0
discourse discourse 2026.1.0
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-770 The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.
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Executive Summary

This vulnerability is an application-level denial of service issue in Discourse's username change functionality. Attackers can send large JSON payloads to the username preference endpoint (PUT /u//preferences/username) on try.discourse.org, causing server delays and resource exhaustion. This results in degraded performance for other users and endpoints.

Impact Analysis

The vulnerability can cause noticeable server delays and resource exhaustion, leading to degraded performance of the Discourse platform for all users. This means legitimate users may experience slow responses or inability to use certain features while the server is under attack.

Mitigation Strategies

The immediate step to mitigate this vulnerability is to upgrade Discourse to one of the patched versions: 3.5.4, 2025.11.2, 2025.12.1, or 2026.1.0. No known workarounds are available.

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