XPath Injection in BIG-IP - CVE-2026-40699
Published: May 14, 2026
Vulnerability identifier: #VU131393
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-40699
CWE-ID: CWE-643
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 disclose sensitive information.
The vulnerability exists due to improper neutralization of data within XPath expressions in the Configuration utility when handling requests to undisclosed pages. A remote user can send crafted requests to disclose sensitive information.
This is a control plane issue only and requires network access to the Configuration utility through the BIG-IP management port or a self-IP address.
How to mitigate CVE-2026-40699
Install security update from vendor's website.