CVE-2026-23743
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2026-01-28

Last updated on: 2026-01-30

Assigner: GitHub, Inc.

Description
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.
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Meta Information
Published
2026-01-28
Last Modified
2026-01-30
Generated
2026-06-16
AI Q&A
2026-01-29
EPSS Evaluated
2026-06-15
NVD
CVE-2026-23743
EUVD
EUVD-2026-4861
Affected Vendors & Products
Showing 4 associated CPEs
Vendor Product Version / Range
discourse discourse to 3.5.4 (exc)
discourse discourse From 2025.11.0 (inc) to 2025.11.2 (exc)
discourse discourse 2025.12.0
discourse discourse 2026.1.0
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-200 The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.
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Executive Summary

This vulnerability in Discourse versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0 involves permalinks to access-restricted resources such as private topics, categories, posts, or hidden tags. When users without access clicked these permalinks, they were redirected to URLs containing the resource slug, which leaked potentially sensitive information like private topic titles through the redirect Location header and the 404 page's search box.

Impact Analysis

The vulnerability can lead to unintended disclosure of sensitive information by leaking resource identifiers and titles to unauthorized users. This could expose private discussions or confidential content to users who should not have access, potentially compromising privacy and confidentiality.

Mitigation Strategies

Upgrade Discourse to version 3.5.4, 2025.11.2, 2025.12.1, or 2026.1.0, as these versions contain the patch for this vulnerability. No known workarounds are available.

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