CVE-2025-24808
Discourse has race condition when adding users to a group DM
Description
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.
INFO
Published Date :
March 26, 2025, 2:15 p.m.
Last Modified :
Aug. 26, 2025, 1:30 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | LOW | [email protected] |
Solution
- Update Discourse to version 3.3.4 or later.
- Update Discourse to version 3.4.0.beta5 or later.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2025-24808.
| URL | Resource |
|---|---|
| https://github.com/discourse/discourse/commit/a16b2f224860f6678f89f5ffa012f0ede17e4095 | Patch |
| https://github.com/discourse/discourse/security/advisories/GHSA-hfcx-qjw6-573r | Third Party Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-24808 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-24808
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-24808 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2025-24808 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Aug. 26, 2025
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N Added CPE Configuration OR *cpe:2.3:a:discourse:discourse:*:*:*:*:beta:*:*:* versions up to (excluding) 3.4.0 *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:*:*:* *cpe:2.3:a:discourse:discourse:*:*:*:*:stable:*:*:* versions up to (excluding) 3.3.3 Added Reference Type GitHub, Inc.: https://github.com/discourse/discourse/commit/a16b2f224860f6678f89f5ffa012f0ede17e4095 Types: Patch Added Reference Type GitHub, Inc.: https://github.com/discourse/discourse/security/advisories/GHSA-hfcx-qjw6-573r Types: Third Party Advisory -
CVE Modified by [email protected]
Mar. 26, 2025
Action Type Old Value New Value Changed Description 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. 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. -
New CVE Received by [email protected]
Mar. 26, 2025
Action Type Old Value New Value Added Description 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. Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N Added CWE CWE-362 Added Reference https://github.com/discourse/discourse/commit/a16b2f224860f6678f89f5ffa012f0ede17e4095 Added Reference https://github.com/discourse/discourse/security/advisories/GHSA-hfcx-qjw6-573r