Cross-site scripting in Discourse

1) Cross-site scripting

EUVDB-ID: #VU86125

Risk: Low

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Clear]

CVE-ID: CVE-2024-23834

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Exploit availability: No

Description

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data. A remote user can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Discourse: 2.1.0 - 3.2.0

CPE2.3

• cpe:2.3:a:discourse:discourse:2.1.0:*:*:*:*:*:*:*
• cpe:2.3:a:discourse:discourse:2.1.1:*:*:*:*:*:*:*
• cpe:2.3:a:discourse:discourse:2.1.2:*:*:*:*:*:*:*

External links

https://github.com/discourse/discourse/security/advisories/GHSA-rj3g-8q6p-63pc
https://github.com/discourse/discourse/commit/568d704a94c528b7c2cb0f3512a7b7b606bc3000
https://meta.discourse.org/t/3-1-5-security-and-bug-fix-release/293094
https://meta.discourse.org/t/3-2-0-beta5-add-groups-to-dms-mobile-chat-footer-redesign-passkeys-enabled-by-default-and-more/293093

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.