CVE-2024-56328

HTMLi(XSS without CSP) via Onebox urls in Discourse

State: Published
Severity: 6.5 Medium
Published: Feb 4, 2025
Updated: Feb 12, 2025
Reserved: Dec 19, 2024

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.

Scores

CVSS	Score	Vector	Source
3.1	6.5 Medium	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L	GitHub_M

Weaknesses

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

Affected Products

Product	Versions
discoursediscourse	stable: <= 3.3.3Affected beta: <= 3.4.0.beta3Affected tests-passed: <= 3.4.0.beta3Affected

References

https://github.com/discourse/discourse/security/advisories/GHSA-j855-mhxj-x6vg

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