CVE-2022-23548

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-01-05 · updated 2026-06-17
Weakness: CWE-1333

Description

Discourse is an option source discussion platform. Prior to version 2.8.14 on the `stable` branch and version 2.9.0.beta16 on the `beta` and `tests-passed` branches, parsing posts can be susceptible to regular expression denial of service (ReDoS) attacks. This issue is patched in versions 2.8.14 and 2.9.0.beta16. There are no known workarounds.

Affected products

discourse: before 2.8.14; 2.9.0-beta1, 2.9.0-beta10, 2.9.0-beta11, 2.9.0-beta12, 2.9.0-beta13, 2.9.0-beta14 (+8) — fixed in 2.8.14

How to fix

Upgrade to a fixed version: discourse 2.8.14. Check the vendor advisory for mitigations.

References

https://github.com/discourse/discourse/pull/19737
https://github.com/discourse/discourse/security/advisories/GHSA-7rw2-f4x7-7pxf
https://github.com/discourse/discourse/pull/19737
https://github.com/discourse/discourse/security/advisories/GHSA-7rw2-f4x7-7pxf

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