CVE-2025-24808

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.

Reserved 2025-01-23 | Published 2025-03-26 | Updated 2025-03-26 | Assigner GitHub_M

Problem types

CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Product status

< 3.3.4
affected

>= 3.4.0.beta1, < 3.4.0.beta5
affected

References

github.com/...course/security/advisories/GHSA-hfcx-qjw6-573r

github.com/...ommit/a16b2f224860f6678f89f5ffa012f0ede17e4095

cve.org (CVE-2025-24808)

nvd.nist.gov (CVE-2025-24808)

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