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CVE-2025-24808 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:3.1 LOWVector:CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N

CNA: [email protected]CVSS-B:4.3 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/discourse/discourse/commit/a16b2f224860f6678f89f5ffa012f0ede17e4095	[email protected]	Patch
https://github.com/discourse/discourse/security/advisories/GHSA-hfcx-qjw6-573r	[email protected]	Vendor Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-362	Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')	[email protected]

Affected Products

Product	Versions
discourse discourse	< 3.3.3 < 3.4.0 3.4.0 beta1 3.4.0 beta2 3.4.0 beta3
CPE 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:::* Remediation No remediation found in references.

Change History

6 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	[email protected]
Jun 17, 2026	CVE Modified	CISA-ADP
Nov 6, 2025	Reanalysis	[email protected]
Aug 26, 2025	Initial Analysis	[email protected]
Mar 26, 2025	CVE Modified	[email protected]
Mar 26, 2025	New CVE Received	[email protected]