Security Advisory

CVE-2025-66488

CVE vulnerability detail — eXtreme Datacenter Security Operations

Published 2026-01-28 18:15:52

Last updated 2026-01-28 19:29:11

Assigner GitHub_M

State PUBLISHED

Description

Discourse is an open source discussion platform. A vulnerability present in versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0 affects anyone who uses S3 for uploads. While scripts may be executed, they will only be run in the context of the S3/CDN domain, with no site credentials. Versions 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0 fix the issue. As a workaround, disallow html or xml files for uploads in authorized_extensions. For existing html xml uploads, site owners can consider deleting them.

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