Vulnerability · Published Feb 4, 2025 · Assigned by GitHub_M

CVE-2024-56328HTMLi(XSS without CSP) via Onebox urls 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 0.4% (higher than 30% of all known vulnerabilities).

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.4%top 69.8% 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 posting a maliciously crafted onebox url. This issue only affects sites with CSP disabled. This problem has been patched in the latest version of Discourse. Users are advised to upgrade. Users unable to upgrade should enable CSP, disable inline Oneboxes globally, or allow specific domains for Oneboxing.

Affected products (as reported)

Vendor	Product	Versions
discourse	discourse	stable: <= 3.3.3beta: <= 3.4.0.beta3tests-passed: <= 3.4.0.beta3

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-j855-mhxj-x6vg x_refsource_CONFIRM