Discourse prior 3.5.4/2025.11.2/2025.12.1/2026.1.0 Username Preference Endpoint /u//preferences/username allocation of resources

CVSS Meta Temp Score
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CTI Interest Score
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4.6$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, has been found in Discourse. Affected by this issue is some unknown functionality of the file /u//preferences/username of the component Username Preference Endpoint. This manipulation causes allocation of resources. This vulnerability is tracked as CVE-2025-68659. The attack is possible to be carried out remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Discourse. It has been declared as problematic. Affected by this vulnerability is an unknown functionality of the file /u//preferences/username of the component Username Preference Endpoint. The manipulation with an unknown input leads to a allocation of resources vulnerability. The CWE definition for the vulnerability is CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. As an impact it is known to affect availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2025-68659 since 12/22/2025. The exploitation appears to be easy. The attack can be launched remotely. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

Upgrading to version 3.5.4, 2025.11.2, 2025.12.1 or 2026.1.0 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2025-206425). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

Name

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.6
VulDB Meta Temp Score: 4.6

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 5.3
NVD Vector: 🔒

CNA Base Score: 4.3
CNA Vector (GitHub_M): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Allocation of resources
CWE: CWE-770 / CWE-400 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Discourse 3.5.4/2025.11.2/2025.12.1/2026.1.0

Timelineinfo

12/22/2025 CVE reserved
01/28/2026 +37 days Advisory disclosed
01/28/2026 +0 days VulDB entry created
01/31/2026 +3 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: GHSA-rmp6-c9rq-6q7p
Status: Confirmed

CVE: CVE-2025-68659 (🔒)
GCVE (CVE): GCVE-0-2025-68659
GCVE (VulDB): GCVE-100-343267
EUVD: 🔒

Entryinfo

Created: 01/28/2026 20:35
Updated: 01/31/2026 07:44
Changes: 01/28/2026 20:35 (64), 01/29/2026 23:13 (1), 01/31/2026 07:44 (11)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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