What is CVE-2026-40703?

CVE-2026-40703 is a medium-severity vulnerability in F5 Big-ip, classified under Cross-Site Request Forgery (CSRF). CVSS score: 5.4/10. Published 2026-05-13.

How severe is CVE-2026-40703?

Medium severity. CVSS v3 base score is 5.4 out of 10.

CSRF in F5 Big-ip

CVE-2026-40703

A cross-site request forgery (CSRF) vulnerability exists in the dashboard of the BIG-IP Configuration utility. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Vulnerability class: CSRF (Cross-Site Request Forgery)

EPSS: 0.000 (9.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L.

Affected products

F5 Big-ip — versions 21.0.0, 17.5.0, 17.1.0

Weakness classification (CWE)

CWE-352 — Cross-Site Request Forgery (CSRF)

References

f5sirt@f5.com (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-40703?: CVE-2026-40703 is a medium-severity vulnerability in F5 Big-ip, classified under Cross-Site Request Forgery (CSRF). CVSS score: 5.4/10. Published 2026-05-13.
How severe is CVE-2026-40703?: Medium severity. CVSS v3 base score is 5.4 out of 10.