Authorization Flaw in Discourse Discussion Platform Exposes User Data
CVE-2026-27150

1.3LOW

Key Information:

Vendor

Discourse
Status
Discourse
Vendor
CVE Published:
26 February 2026

What is CVE-2026-27150?

Discourse, an open-source discussion platform, has a vulnerability that arises from a missing authorization check in the Data Explorer's QueryGroupBookmarkable feature. This flaw permits any logged-in user to create bookmarks for query groups without the necessary access, which can lead to unauthorized metadata disclosure via bookmark reminder notifications. The vulnerability was addressed in versions 2025.12.2, 2026.1.1, and 2026.2.0, which implement a requirement for validate_before_create, ensuring that similar issues are prevented in the future. No workarounds are available for users running vulnerable versions.

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Deploy the Patch

Affected Version(s)

discourse < 2025.12.2 < 2025.12.2

discourse >= 2026.1.0-latest, < 2026.1.1 < 2026.1.0-latest, 2026.1.1

discourse >= 2026.2.0-latest, < 2026.2.0 < 2026.2.0-latest, 2026.2.0

References

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

CVSS V4

Score:
1.3
Severity:
LOW
Confidentiality:
Low
Integrity:
Low
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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