Vulnerability · Published Oct 7, 2024 · Assigned by GitHub_M

CVE-2024-47772Cross-site Scripting (XSS) via chat excerpts when content security policy (CSP) disabled in Discourse

Medium 6.5

In plain English

A medium-severity cross-site scripting in discourse from discourse. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 26% of all known vulnerabilities).

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.3%top 74.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Discourse is an open source platform for community discussion. An attacker can execute arbitrary JavaScript on users' browsers by sending a maliciously crafted chat message and replying to it. This issue only affects sites with CSP disabled. This problem is patched in the latest version of Discourse. All users are advised to upgrade. Users unable to upgrade should ensure CSP is enabled on the forum. Users who do upgrade should also consider enabling a CSP as well as a proactive measure.

Affected products (as reported)

Vendor	Product	Versions
discourse	discourse	stable: < 3.3.2tests-passed: < 3.4.0.beta2

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L

References

https://github.com/discourse/discourse/security/advisories/GHSA-67mh-xhmf-c56h x_refsource_CONFIRM
https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP x_refsource_MISC