# CVE-2026-40703: F5 BIG-IP CSRF in Configuration utility dashboard

Source: https://junglewise.ai/threats/cve-2026-40703-f5-big-ip-csrf-in-configuration-utility-dashboard  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-13. Updated: 2026-06-24  
License: CC BY 4.0 with a link back

CVE-2026-40703 · Severity: medium · CVSS 5.4 · Published 2026-05-13

A security vulnerability exists in the management dashboard of F5 BIG-IP networking devices. An attacker could trick an authenticated administrator into performing unintended actions on the device by clicking a malicious link. This could lead to unauthorized configuration changes or service disruptions on the network appliance.

Technologies: [F5 BIG-IP](https://junglewise.ai/threats/technologies/big-ip). Vendors: [F5](https://junglewise.ai/threats/vendors/f5).

## Quick answers

**Is CVE-2026-40703 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-40703 being exploited in the wild.

**How severe is CVE-2026-40703?** Medium severity, with a CVSS score of 5.4, published 13 May 2026.

**Which products and versions are affected?** F5 BIG-IP 17.5.0 - 17.5.1, 16.1.0 - 16.1.6, Not specified (EoTS versions excluded).

**Is there a fix for CVE-2026-40703?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-40703 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-40703?** Check whether you run F5 BIG-IP at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A Cross-Site Request Forgery (CSRF) vulnerability (CWE-352) exists in the F5 BIG-IP Configuration utility dashboard. The flaw allows a remote attacker to induce a victim (typically an administrator with an active session) to perform unintended actions via the web interface. The attack requires user interaction, specifically that the victim visits a malicious website or clicks a crafted link while authenticated to the BIG-IP management console. Successful exploitation can result in unauthorized configuration modifications or partial impact on system availability. F5 has released updates for affected versions, including 17.5.1.4 and later.

## Affected products

- F5 BIG-IP 17.5.0 - 17.5.1, 16.1.0 - 16.1.6

## Timeline

- 2026-05-13: disclosed
- 2026-05-13: advisory

## References

- [https://my.f5.com/manage/s/article/K35544022](https://my.f5.com/manage/s/article/K35544022)

## Related threats

- [F5 BIG-IP privilege escalation in TMUI](https://junglewise.ai/threats/cve-2026-66842-f5-big-ip-privilege-escalation-in-tmui)
- [F5 BIG-IP Configuration utility error message spoofing](https://junglewise.ai/threats/cve-2026-63020-f5-big-ip-configuration-utility-error-message-spoofing)
- [F5 BIG-IP denial of service in HTTP/2 profile memory management](https://junglewise.ai/threats/cve-2026-59762-f5-big-ip-denial-of-service-in-http-2-profile-memory-management)
- [F5 BIG-IP and BIG-IQ incorrect permission assignment in tmsh and iControl REST](https://junglewise.ai/threats/cve-2026-42937-f5-big-ip-and-big-iq-incorrect-permission-assignment-in-tmsh-and)
- [F5 BIG-IP Appliance mode restriction bypass via path traversal](https://junglewise.ai/threats/cve-2026-42930-f5-big-ip-appliance-mode-restriction-bypass-via-path-traversal)