CVE-2026-46413: Discourse

Medium severity, CVSS 6.5. EPSS: 0.5% chance of exploitation in the next 30 days.

Discourse is an open-source discussion platform. Prior to 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5, regular users could route direct S3 multipart uploads through ExternalUploadManager into the admin backup store. This issue is fixed in versions 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5.

Affected products

• Discourse Discourse: from 2026.1.0, before 2026.1.5 (fixed in 2026.1.5); from 2026.4.0, before 2026.4.2 (fixed in 2026.4.2); from 2026.5.0, before 2026.5.1 (fixed in 2026.5.1); version 2026.6.0 only

Published 2026-07-09. Last modified 2026-07-14.