Use of insufficiently random values in Discourse - CVE-2023-36473
Published: July 11, 2023 / Updated: July 1, 2026
Vulnerability identifier: #VU136086
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2023-36473
CWE-ID: CWE-330
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Civilized Discourse Construction Kit, Inc.
Affected software:
Discourse
Discourse
Detailed vulnerability description
The vulnerability allows a remote user to bypass CSP protection and execute cross-site scripting attacks.
The vulnerability exists due to improper reuse of a CSP nonce in Content Security Policy handling when processing content that relies on the nonce for script authorization. A remote user can leverage a discovered cross-site scripting vector to bypass CSP protection and execute cross-site scripting attacks.
There are no known cross-site scripting vectors at the moment, but any such vector could use this issue to completely bypass CSP.
How to mitigate CVE-2023-36473
Install security update from vendor's website.