CVE-2025-68659 json
Discourse has DoS vulnerability in username change endpoint
published 2026-01-28 9 mo ago modified 2026-09-08 2 mo ago also BIT-discourse-2025-68659 , EUVD-2025-206425 , GHSA-rmp6-c9rq-6q7p
- cvss
- 4.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 17%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- bitnami discourse 3.5.4, 2025.11.2, 2025.12.1, 2026.1.0
- discourse discourse 3.5.4, 2025.11.2, 2025.12.1, 2026.1.0
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 9 mo ago
Exploit prediction
0.26% chance of exploitation in the next 30 days, higher than 17% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L |
| NVD | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |
| OSV | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| bitnami | discourse | <3.5.4 >=2025.11.0, <2025.11.2 >=2025.12.0, <2025.12.1 >=2026.1.0, <2026.1.0 |
3.5.4 2025.11.2 2025.12.1 2026.1.0 |
Affected products
- discourse discourse
Classification
- Weakness
-
- CWE-770 Allocation of Resources Without Limits or Throttling
References
-
github.com
/discourse/discourse/security/advisories/GHSA-rmp6-c9rq-6q7p
third-party-advisory, advisory
-
nvd.nist.gov
/vuln/detail/CVE-2025-68659
web
Sources
- CVE List CVE-2025-68659
- NVD CVE-2025-68659
- OSV BIT-discourse-2025-68659
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.