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NVD Vulnerability Details :
CVE-2025-66488
Analyzed
More InfoOfficial Page
Source-security-advisories@github.com
View Known Exploited Vulnerability (KEV) details
Published At-28 Jan, 2026 | 19:16
Updated At-30 Jan, 2026 | 20:31

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.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary3.14.6MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:L
Primary3.16.1MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Type: Secondary
Version: 3.1
Base score: 4.6
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:L
Type: Primary
Version: 3.1
Base score: 6.1
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CPE Matches
Civilized Discourse Construction Kit, Inc.
discourse
>>discourse>>Versions before 3.5.4(exclusive)
cpe:2.3:a:discourse:discourse:*:*:*:*:stable:*:*:*
Civilized Discourse Construction Kit, Inc.
discourse
>>discourse>>Versions from 2025.11.0(inclusive) to 2025.11.2(exclusive)
cpe:2.3:a:discourse:discourse:*:*:*:*:stable:*:*:*
Civilized Discourse Construction Kit, Inc.
discourse
>>discourse>>2025.12.0
cpe:2.3:a:discourse:discourse:2025.12.0:*:*:*:stable:*:*:*
Civilized Discourse Construction Kit, Inc.
discourse
>>discourse>>2026.1.0
cpe:2.3:a:discourse:discourse:2026.1.0:*:*:*:stable:*:*:*
Weaknesses
CWE IDTypeSource
CWE-116Secondarysecurity-advisories@github.com
CWE ID: CWE-116
Type: Secondary
Source: security-advisories@github.com
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://github.com/discourse/discourse/security/advisories/GHSA-68jp-3934-62rxsecurity-advisories@github.com
Third Party Advisory
Hyperlink: https://github.com/discourse/discourse/security/advisories/GHSA-68jp-3934-62rx
Source: security-advisories@github.com
Resource:
Third Party Advisory
Change History
0Changes found
Details not found