What is the CVSS score of CVE-2026-23743?

CVE-2026-23743 has a CVSS 3.1 base score of 7.5 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N. EPSS exploitation probability: 0.0%.

Which versions of Discourse are affected by CVE-2026-23743?

A HIGH severity vulnerability (CVE-2026-23743) has been identified in Discourse affecting all instances of this open-source discussion platform.

How to fix or mitigate CVE-2026-23743?

Within 24 hours: Inventory all Discourse deployments and confirm affected versions; disable public access to Discourse instances if feasible. Within 7 days: Implement compensating controls listed below; increase monitoring for suspicious authentication attempts and data access patterns. Within 30 days: Monitor Discourse vendor communications for patch release; conduct security assessment of exposed data; prepare patch deployment plan for immediate application when available.

Discourse CVE-2026-23743

HIGH

Information Exposure (CWE-200)

2026-01-28 security-advisories@github.com

Information Disclosure Discourse

7.5

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

7.5 HIGH

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:54 vuln.today

CVE Published

Jan 28, 2026 - 21:16 nvd

HIGH 7.5

DescriptionGitHub Advisory

Discourse is an open source discussion platform. In versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0, permalinks pointing to access-restricted resources (private topics, categories, posts, or hidden tags) were redirecting users to URLs containing the resource slug, even when the user didn't have access to view the resource. This leaked potentially sensitive information (e.g., private topic titles) via the redirect Location header and the 404 page's search box. This issue is patched in versions 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0. No known workarounds are available.

AnalysisAI

Discourse is an open source discussion platform. [CVSS 7.5 HIGH]

Technical ContextAI

Classified as CWE-200 (Information Exposure). Affects Discourse. Discourse is an open source discussion platform. In versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0, permalinks pointing to access-restricted resources (private topics, categories, posts, or hidden tags) were redirecting users to URLs containing the resource slug, even when the user didn't have access to view the resource. This leaked potentially sensitive information (e.g., private topic titles) via the redirect Location header and the 404 page's search box. This issue is patched in