Unauthorized Modification of User Group Notifications in Discourse by Discourse
CVE-2026-33423

1.3LOW

Key Information:

Vendor

Discourse
Status
Discourse
Vendor
CVE Published:
20 March 2026

What is CVE-2026-33423?

A vulnerability in the Discourse discussion platform allows staff members to modify the group notification levels of any user, potentially altering their preferences without consent. This issue is present in versions prior to 2026.3.0-latest.1, 2026.2.1, and 2026.1.2, and those utilizing these versions are advised to upgrade promptly, as no workarounds exist.

Affected Version(s)

discourse >= 2026.1.0-latest, < 2026.1.2 < 2026.1.0-latest, 2026.1.2

discourse >= 2026.2.0-latest, < 2026.2.1 < 2026.2.0-latest, 2026.2.1

discourse = 2026.3.0-latest = 2026.3.0-latest

References

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

CVSS V4

Score:
1.3
Severity:
LOW
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.