#VU83020 Improper access control in Discourse - CVE-2023-46130

Vulnerability identifier: #VU83020

Vulnerability risk: Low

CVSSv4.0: 1.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2023-46130

CWE-ID: CWE-284

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 gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to height value bypass in some theme components. A remote user can add svgs with unlimited height attributes and affect the availability of subsequent replies in a topic.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Discourse: 3.0 beta - 3.2.0 beta2

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External links
https://github.com/discourse/discourse/security/advisories/GHSA-c876-638r-vfcg
https://github.com/discourse/discourse/commit/6183d9633de873ac2b1e9cdb6ac1c94b4ffae9cb
https://github.com/discourse/discourse/commit/89a2e60706ce22e4afc463d03af2f34c53291800

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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.