Improper access control in BIG-IP - CVE-2026-40631
Published: May 14, 2026
Vulnerability identifier: #VU131408
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-40631
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: F5 Networks
Affected software:
BIG-IP
BIG-IP
Detailed vulnerability description
The vulnerability allows a remote user to escalate privileges or bypass Appliance mode restrictions.
The vulnerability exists due to improper access control in iControl SOAP when modifying configuration objects. A remote privileged user can modify configuration objects through iControl SOAP to escalate privileges or bypass Appliance mode restrictions.
In Appliance mode deployments, successful exploitation can cross a security boundary. This is a control plane issue only.
How to mitigate CVE-2026-40631
Install security update from vendor's website.