Improper access control in Discourse - CVE-2023-28111
Published: March 17, 2023 / Updated: July 1, 2026
Vulnerability identifier: #VU136079
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2023-28111
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 disclose sensitive information.
The vulnerability exists due to improper access control in SSRF protection for private IPv4 addresses when processing IPv4-mapped IPv6 addresses. A remote user can use an IPv4-mapped IPv6 address to disclose sensitive information.
User interaction is required.
How to mitigate CVE-2023-28111
Install security update from vendor's website.