CVE-2023-45806

Discourse vulnerable to DoS via Regexp Injection in Full Name

Description

Discourse is an open source platform for community discussion. Prior to version 3.1.3 of the `stable` branch and version 3.2.0.beta3 of the `beta` and `tests-passed` branches, if a user has been quoted and uses a `|` in their full name, they might be able to trigger a bug that generates a lot of duplicate content in all the posts they've been quoted by updating their full name again. Version 3.1.3 of the `stable` branch and version 3.2.0.beta3 of the `beta` and `tests-passed` branches contain a patch for this issue. No known workaround exists, although one can stop the "bleeding" by ensuring users only use alphanumeric characters in their full name field.

Category

4.3
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 3.92% Top 15%
Vendor Advisory github.com
Affected: discourse discourse
Published at:
Updated at:

References

Link Tags
https://github.com/discourse/discourse/security/advisories/GHSA-hcgf-hg2g-mw78 patch vendor advisory
https://github.com/discourse/discourse/commit/2ec25105179199cf80912bf011c18b8b870e1863 patch
https://github.com/discourse/discourse/commit/7d484864fe91ff79c478f57e7ddb1235d701921e patch

Frequently Asked Questions

What is the severity of CVE-2023-45806?
CVE-2023-45806 has been scored as a medium severity vulnerability.
How to fix CVE-2023-45806?
To fix CVE-2023-45806, 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-2023-45806 being actively exploited in the wild?
It is possible that CVE-2023-45806 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~4% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2023-45806?
CVE-2023-45806 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.