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Medium severity4.6OSV Advisory· Published Jan 28, 2026· Updated Jun 17, 2026

CVE-2025-66488

CVE-2025-66488

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

6
  • Discourse (software)/DiscourseOSV5 versions
    beta, latest-release, release, …+ 4 more
    • (no CPE)range: beta, latest-release, release, …
    • cpe:2.3:a:discourse:discourse:*:*:*:*:stable:*:*:*range: <3.5.4
    • cpe:2.3:a:discourse:discourse:2025.12.0:*:*:*:stable:*:*:*
    • cpe:2.3:a:discourse:discourse:2026.1.0:*:*:*:stable:*:*:*
    • (no CPE)range: <3.5.4, <2025.11.2, <2025.12.1, <2026.1.0
  • osv-coords
    pkg:bitnami/discourse
    Range: < 3.5.4

Patches

Vulnerability mechanics

References

1

News mentions

0

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