Improper access control in Discourse - CVE-2026-44787
Published: July 1, 2026
Vulnerability identifier: #VU136594
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2026-44787
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Civilized Discourse Construction Kit, Inc.
Affected software:
Discourse
Discourse
Detailed vulnerability description
The vulnerability allows a remote attacker to disclose sensitive information and post whisper content.
The vulnerability exists due to improper access control in the signup flow when assigning primary_group_id during account registration. A remote attacker can register a new account with a primary_group_id that grants whisper-group privileges to disclose sensitive information and post whisper content.
Only sites that have configured the whispers_allowed_groups setting to include one or more groups are affected. The default configuration is not affected.
How to mitigate CVE-2026-44787
Install security update from vendor's website.