Improper access control in Discourse - CVE-2026-59829
Published: July 29, 2026
Vulnerability identifier: #VU140001
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-59829
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Affected software:
Discourse
Discourse
Detailed vulnerability description
The vulnerability allows a remote user to disclose sensitive information.
The vulnerability exists due to improper access control in the review queue when displaying flag-related private message excerpts and permalinks. A remote user can access the review queue to disclose sensitive information.
Only sites with category group moderation enabled are affected. The exposure is limited to excerpts and permalinks of notify_moderators flag messages, including cases involving core flags raised before a moderator's group was granted moderation of the category.
How to mitigate CVE-2026-59829
Install security update from vendor's website.