CVE-2024-56328CWE-79

HTMLi(XSS without CSP) via Onebox urls in Discourse

Medium · published February 4, 2025

CVSS v3.1

6.5

EPSS

Percentile

28.9

In the wild

Unconfirmed

What it is

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.

The record

Technical detail

CVSS v3.1: 6.5 · MEDIUM
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
CVSS v4.0: Not supplied
EPSS: 0.00362 · 28.9th percentile
Weakness: CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published: 2025-02-04T20:55Z

EPSS history

Timeline

04 FEB 20:55Z
HTMLi(XSS without CSP) via Onebox urls in Discourse
cvelistv5