#VU78758 Race condition in Discourse - CVE-2023-37904

Vulnerability identifier: #VU78758

Vulnerability risk: Low

CVSSv4.0: 0.4 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2023-37904

CWE-ID: CWE-362

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Discourse
Web applications / Forum & blogging software

Vendor: Civilized Discourse Construction Kit, Inc.

Description

The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists due to a race condition in Accept Invite. A remote user can exploit the race and create more users than permitted from invite links.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Discourse: 3.0.5 - 3.1.0 beta6

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External links
https://github.com/discourse/discourse/commit/62a609ea2d0645a27ee8adbb01ce10a5e03a600b
https://github.com/discourse/discourse/security/advisories/GHSA-6wj5-4ph2-c7qg

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.