Authorization Bypass Vulnerability in Discourse Open-Source Discussion Platform
CVE-2026-33300

5.3MEDIUM

Key Information:

Vendor

Discourse
Status
Discourse
Vendor
CVE Published:
31 March 2026

What is CVE-2026-33300?

An authorization bypass vulnerability in Discourse allows moderators unauthorized access to sensitive information, including hidden group names and user counts. This issue affects versions from 2026.1.0-latest to before 2026.1.3, 2026.2.0-latest to before 2026.2.2, and 2026.3.0-latest to before 2026.3.0. The vulnerability has been addressed and patched in the updated versions 2026.1.3, 2026.2.2, and 2026.3.0.

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Deploy the Patch

Affected Version(s)

discourse >= 2026.1.0-latest, < 2026.1.3 < 2026.1.0-latest, 2026.1.3

discourse >= 2026.2.0-latest, < 2026.2.2 < 2026.2.0-latest, 2026.2.2

discourse >= 2026.3.0-latest, < 2026.3.0 < 2026.3.0-latest, 2026.3.0

References

https://github.com/discourse/discourse/security/advisorie...
x_refsource_CONFIRM
https://github.com/discourse/discourse/commit/07f66658cce...
x_refsource_MISC

CVSS V4

Score:
5.3
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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