CVE-2025-24808

Discourse is an open-source discussion platform. Prior to versions `3.3.4` on the `stable` branch and `3.4.0.beta5` on the `beta` branch, someone who is about to reach the limit of users in a group DM may send requests to add new users in parallel. The requests might all go through ignoring the limit due to a race condition. The patch in versions `3.3.4` and `3.4.0.beta5` uses the `lock` step in service to wrap part of the `add_users_to_channel` service inside a distributed lock/mutex in order to avoid the race condition.

CVSS v3 4.3 MEDIUM

4.3^/10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 2.8 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/discourse/discourse/commit/a16b2f224860f6678f89f5ffa012f0ede17e4095	Patch
https://github.com/discourse/discourse/security/advisories/GHSA-hfcx-qjw6-573r	Third Party Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:discourse:discourse:::::stable:::*
	cpe:2.3:a:discourse:discourse:::::beta:::*
	cpe:2.3:a:discourse:discourse:3.4.0:beta1:::beta:::*
	cpe:2.3:a:discourse:discourse:3.4.0:beta2:::beta:::*
	cpe:2.3:a:discourse:discourse:3.4.0:beta3:::beta:::*
	cpe:2.3:a:discourse:discourse:3.4.0:beta4:::beta:::*

History

26 Aug 2025, 01:30

Type	Values Removed	Values Added
First Time		Discourse Discourse discourse
CPE		cpe:2.3:a:discourse:discourse:3.4.0:beta1:::beta:::* cpe:2.3:a:discourse:discourse:3.4.0:beta4:::beta:::* cpe:2.3:a:discourse:discourse:::::stable:::* cpe:2.3:a:discourse:discourse:3.4.0:beta3:::beta:::* cpe:2.3:a:discourse:discourse:3.4.0:beta2:::beta:::* cpe:2.3:a:discourse:discourse:::::beta:::*
References	~~() https://github.com/discourse/discourse/commit/a16b2f224860f6678f89f5ffa012f0ede17e4095 -~~	() https://github.com/discourse/discourse/commit/a16b2f224860f6678f89f5ffa012f0ede17e4095 - Patch
References	~~() https://github.com/discourse/discourse/security/advisories/GHSA-hfcx-qjw6-573r -~~	() https://github.com/discourse/discourse/security/advisories/GHSA-hfcx-qjw6-573r - Third Party Advisory

27 Mar 2025, 16:45

Type	Values Removed	Values Added
Summary		(es) Discourse es una plataforma de discusión de código abierto. Antes de las versiones 3.3.4 de la rama estable y 3.4.0.beta5 de la rama beta, alguien que estuviera a punto de alcanzar el límite de usuarios en un mensaje directo grupal podía enviar solicitudes para agregar nuevos usuarios en paralelo. Debido a una condición de ejecución, todas las solicitudes podían procesarse ignorando el límite. El parche de las versiones 3.3.4 y 3.4.0.beta5 utiliza el paso de bloqueo del servicio para encapsular parte del servicio `add_users_to_channel` dentro de un bloqueo/mutex distribuido y así evitar la condición de ejecución.

26 Mar 2025, 15:16

Type	Values Removed	Values Added
Summary	(en) Discourse is an open-source discussion platform. Prior to versions 3.3.4 on the `stable` branch and `3.4.0.beta5` on the `beta` branch, someone who is about to reach the limit of users in a group DM may send requests to add new users in parallel. The requests might all go through ignoring the limit due to a race condition. The patch in versions `3.3.4` and `3.4.0.beta5` uses the `lock` step in service to wrap part of the `add_users_to_channel` service inside a distributed lock/mutex in order to avoid the race condition.	(en) Discourse is an open-source discussion platform. Prior to versions `3.3.4` on the `stable` branch and `3.4.0.beta5` on the `beta` branch, someone who is about to reach the limit of users in a group DM may send requests to add new users in parallel. The requests might all go through ignoring the limit due to a race condition. The patch in versions `3.3.4` and `3.4.0.beta5` uses the `lock` step in service to wrap part of the `add_users_to_channel` service inside a distributed lock/mutex in order to avoid the race condition.

26 Mar 2025, 14:15

Type	Values Removed	Values Added
New CVE

Information

Published : 2025-03-26 14:15

Updated : 2025-08-26 01:30

NVD link : CVE-2025-24808

Mitre link : CVE-2025-24808

CVE.ORG link : CVE-2025-24808

JSON object : View

Products Affected

discourse

discourse

CWE

CWE-362

Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

4.3 /10