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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History
Thu, 29 Jan 2026 10:15:00 +0000
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Discourse
Discourse discourse |
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Discourse
Discourse discourse |
Wed, 28 Jan 2026 21:15:00 +0000
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ssvc
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Wed, 28 Jan 2026 19:00:00 +0000
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| 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. | |
| Title | Discourse has DoS vulnerability in username change endpoint | |
| Weaknesses | CWE-770 | |
| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: GitHub_M
Published: 2026-01-28T18:51:40.341Z
Updated: 2026-01-28T20:20:41.258Z
Reserved: 2025-12-22T17:55:15.946Z
Link: CVE-2025-68659
Updated: 2026-01-28T20:20:34.273Z
Status : Awaiting Analysis
Published: 2026-01-28T19:16:23.563
Modified: 2026-01-29T16:31:00.867
Link: CVE-2025-68659
No data.