Information Leak in Discourse Open Source Platform
CVE-2026-23743

6.9MEDIUM

Key Information:

Vendor

Discourse
Status
Discourse
Vendor
CVE Published:
28 January 2026

What is CVE-2026-23743?

An information disclosure vulnerability in Discourse was identified whereby permalinks directed users to access-restricted resources, inadvertently exposing sensitive information like private topic titles. This issue affected versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0, allowing unauthorized users to view URLs that should have been inaccessible. The flaw was resolved in the mentioned versions, eliminating the potential for such data leaks.

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Deploy the Patch

Affected Version(s)

discourse < 3.5.4 < 3.5.4

discourse >= 2025.11.0-latest, < 2025.11.2 < 2025.11.0-latest, 2025.11.2

discourse >= 2025.12.0-latest, < 2025.12.1 < 2025.12.0-latest, 2025.12.1

References

https://github.com/discourse/discourse/security/advisorie...
x_refsource_CONFIRM

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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