CVE-2023-37467

Discourse CSP nonce reuse vulnerability for anonymous users

Description

Discourse is an open source discussion platform. Prior to version 3.1.0.beta7 of the `beta` and `tests-passed` branches, a CSP (Content Security Policy) nonce reuse vulnerability was discovered could allow cross-site scripting (XSS) attacks to bypass CSP protection for anonymous (i.e. unauthenticated) users. There are no known XSS vectors at the moment, but should one be discovered, this vulnerability would allow the XSS attack to bypass CSP and execute successfully. This vulnerability isn't applicable to logged-in users. Version 3.1.0.beta7 contains a patch. The stable branch doesn't have this vulnerability. A workaround to prevent the vulnerability is to disable Google Tag Manager, i.e., unset the `gtm container id` setting.

Categories

6.8
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.19%
Vendor Advisory github.com
Affected: discourse discourse
Published at:
Updated at:

References

Link Tags
https://github.com/discourse/discourse/security/advisories/GHSA-gr5h-hm62-jr3j vendor advisory
https://github.com/discourse/discourse/commit/0976c8fad6970b6182e7837bf87de07709407f25 patch

Frequently Asked Questions

What is the severity of CVE-2023-37467?
CVE-2023-37467 has been scored as a medium severity vulnerability.
How to fix CVE-2023-37467?
To fix CVE-2023-37467, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2023-37467 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2023-37467 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2023-37467?
CVE-2023-37467 affects discourse discourse.
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