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CVE-2023-45806

MediumPublished

Discourse vulnerable to DoS via Regexp Injection in Full Name

Published: Nov 10, 2023
Updated: Sep 3, 2024
Assigning CNA: GitHub_M
Evidence observed: Aug 5, 2026

Primary CVSS

5.4/ 10Medium

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L

EPSS probability estimate

1.0%

Low · next 30 days

Percentile: 60.8%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

discourse-CVE-2023-45806Patch
Ruby script to fix quote attribution vulnerability (CVE-2023-45806) in Discourse forums by searching and patching malformed quote blocks with configurable dry-run mode.

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