Unrated severityNVD Advisory· Published Jul 9, 2026· Updated Jul 14, 2026
Discourse: Remote code execution via pdf uploads
CVE-2026-55420
Description
Discourse is an open-source discussion platform. Prior to 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5, under certain non-default configurations, processing of PDF uploads could be exploited to obtain RCE on the server. This issue is patched in 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5.
Affected products
2- Range: <2026.1.5, <2026.4.2, <2026.5.1, <2026.6.0
Patches
Vulnerability mechanics
References
6- github.com/discourse/discourse/commit/ca5a7e06167561928556afa2f237d67e459c6914mitrex_refsource_MISC
- github.com/discourse/discourse/releases/tag/v2026.1.5mitrex_refsource_MISC
- github.com/discourse/discourse/releases/tag/v2026.4.2mitrex_refsource_MISC
- github.com/discourse/discourse/releases/tag/v2026.5.1mitrex_refsource_MISC
- github.com/discourse/discourse/releases/tag/v2026.6.0mitrex_refsource_MISC
- github.com/discourse/discourse/security/advisories/GHSA-7wq5-jgww-5rw3mitrex_refsource_CONFIRM
News mentions
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