CRLF injection in OPNsense - CVE-2026-57154
Published: July 3, 2026 / Updated: July 3, 2026
Vulnerability identifier: #VU136832
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Green
CVE-ID: CVE-2026-57154
CWE-ID: CWE-93
Exploitation vector: Remote access
Exploit availability:
Public exploit is available
Vendor: Deciso
Affected software:
OPNsense
OPNsense
Detailed vulnerability description
The vulnerability allows a remote attacker to inject arbitrary data in server response.
The vulnerability exists due to insufficient validation of attacker-supplied data within multiple GUI text fields. A remote user can pass specially crafted data to the application containing CR-LF characters and modify application behavior.
How to mitigate CVE-2026-57154
Install updates from vendor's website.