Improper access control in Discourse - CVE-2026-44783
Published: July 1, 2026
Vulnerability identifier: #VU136575
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-44783
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 user to inject content into staff-only whisper posts.
The vulnerability exists due to improper access control in replies to whisper posts when handling reply submissions. A remote user can submit a reply to a whisper post to inject content into staff-only whisper posts.
Only sites with whispers enabled are affected, and the injected content is visible to whisperers alongside legitimate whispers.
How to mitigate CVE-2026-44783
Install security update from vendor's website.