CVE-2023-43659

Cross-site Scripting via email preview when CSP disabled in Discourse

Description

Discourse is an open source platform for community discussion. Improper escaping of user input allowed for Cross-site Scripting attacks via the digest email preview UI. This issue only affects sites with CSP disabled. This issue has been patched in the 3.1.1 stable release as well as the 3.2.0.beta1 release. Users are advised to upgrade. Users unable to upgrade should ensure CSP is enabled on the forum.

Category

8.0
CVSS
Severity: High
CVSS 3.1 •
EPSS 0.52%
Vendor Advisory github.com
Affected: discourse discourse
Published at:
Updated at:

References

Link Tags
https://github.com/discourse/discourse/security/advisories/GHSA-g4qg-5q2h-m8ph vendor advisory
https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP third party advisory

Frequently Asked Questions

What is the severity of CVE-2023-43659?
CVE-2023-43659 has been scored as a high severity vulnerability.
How to fix CVE-2023-43659?
To fix CVE-2023-43659, 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-2023-43659 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2023-43659 is being actively exploited. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2023-43659?
CVE-2023-43659 affects discourse discourse.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.