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OpenAdvisories
Medium · 5.7 CVE-2022-23549 EUVD-2022-28567

Discourse vulnerable to bypass of post max_length using HTML comments

Published Jan 5, 2023 · Updated Mar 10, 2025 · Assigned by GitHub_M

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, users can create posts with raw body longer than the `max_length` site setting by including html comments that are not counted toward the character limit. This issue is patched in versions 2.8.14 and 2.9.0.beta16. There are no known workarounds.

Affected products

VendorProductAffectedFixed
discourse discourse 2.8.14 – < 2.8.14, 2.9.0.beta0 – ≤ 2.9.0.beta0, 2.9.0.beta16 – < 2.9.0.beta16 2.8.14

References