CVE-2025-66488
Jan. 29, 2026, 4:31 p.m.
4.6
Medium
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.
Product(s) Impacted
| Vendor | Product | Versions |
|---|---|---|
| Discourse |
|
|
Weaknesses
Common security weaknesses mapped to this vulnerability.
CWE-116
Improper Encoding or Escaping of Output
The product prepares a structured message for communication with another component, but encoding or escaping of the data is either missing or done incorrectly. As a result, the intended structure of the message is not preserved.
*CPE(s)
Affected systems and software identified for this CVE.
| Type | Vendor | Product | Version | Update | Edition | Language | Software Edition | Target Software | Target Hardware | Other Information |
|---|---|---|---|---|---|---|---|---|---|---|
| a | discourse | discourse | <3.5.4 | / | / | / | / | / | / | / |
| a | discourse | discourse | 3.5.4 | / | / | / | / | / | / | / |
| a | discourse | discourse | 2025.11.2 | / | / | / | / | / | / | / |
| a | discourse | discourse | 2025.12.1 | / | / | / | / | / | / | / |
| a | discourse | discourse | 2026.1.0 | / | / | / | / | / | / | / |
Tags
CVSS Score
CVSS Data - 3.1
- Attack Vector: NETWORK
- Attack Complexity: LOW
- Privileges Required: LOW
- Scope: UNCHANGED
- Confidentiality Impact: NONE
- Integrity Impact: LOW
- Availability Impact: LOW
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:L
Timeline
Published: Jan. 28, 2026, 7:16 p.m.
Last Modified: Jan. 29, 2026, 4:31 p.m.
Last Modified: Jan. 29, 2026, 4:31 p.m.
Status : Undergoing Analysis
CVE has been recently published to the CVE List and has been received by the NVD.
More infoSource
*Disclaimer: Some vulnerabilities do not have an associated CPE. To enhance the data, we use AI to infer CPEs based on CVE details. This is an automated process and might not always be accurate.