#VU71600 Information disclosure in Discourse - CVE-2023-23624

Vulnerability identifier: #VU71600

Vulnerability risk: Low

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2023-23624

CWE-ID: CWE-200

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 access to potentially sensitive information.

The vulnerability exists due to an error in application. Using the exclude_tag param a use can filter out topics and deduce, which ones are using a specific hidden tag. This affects any Discourse site using hidden tags in public categories.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Discourse: 0.8.0 - 3.0.0

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External links
https://github.com/discourse/discourse/security/advisories/GHSA-qgj5-g5vf-fm7q

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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