Vulnerability in Discourse Discussion Platform Allows Unauthorized Group Privileges
CVE-2026-44787

8.2HIGH

Key Information:

Vendor

Discourse
Status
Discourse
Vendor
CVE Published:
9 July 2026

What is CVE-2026-44787?

The Discourse platform has a vulnerability in its signup process where newly registered users can manipulate the 'primary_group_id' setting. This allows them to gain whisper-group privileges erroneously in configurations where 'whispers_allowed_groups' is enabled. Versions prior to 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5 are affected. The issue has been addressed in these later versions, emphasizing the importance of upgrading to ensure proper group membership verification.

Affected Version(s)

discourse >= 2026.1.0-latest, < 2026.1.5 < 2026.1.0-latest, 2026.1.5

discourse >= 2026.4.0-latest, < 2026.4.2 < 2026.4.0-latest, 2026.4.2

discourse >= 2026.5.0-latest, < 2026.5.1 < 2026.5.0-latest, 2026.5.1

References

https://github.com/discourse/discourse/security/advisorie...
x_refsource_CONFIRM
https://github.com/discourse/discourse/commit/012796ac28c...
x_refsource_MISC
https://github.com/discourse/discourse/commit/0f50a07a6ef...
x_refsource_MISC

CVSS V3.1

Score:
8.2
Severity:
HIGH
Confidentiality:
High
Integrity:
Low
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.