CVEvulnerability

CVE-2025-66488

6.1 MEDIUM Published 2026-01-28 Modified 2026-06-17 Official page ↗
Status
Analyzed
Published
2026-01-28
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
4.6 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:L
CVSS 3.1 ([email protected])
6.1 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weaknesses
CWE-116

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.

Affected configurations

• discourse discourse (< 3.5.4) • discourse discourse (>= 2025.11.0 < 2025.11.2) • discourse discourse 2025.12.0 • discourse discourse 2026.1.0

Related

Weakness · CWE (1)

  • CWE-116 Improper Encoding or Escaping of Output weakness

References