Quick answers
- Is CVE-2026-63020 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-63020 being exploited in the wild.
- How severe is CVE-2026-63020?
- Low severity, with a CVSS score of 3.1, published 2 September 2026.
- Which products and versions are affected?
- F5 BIG-IP <UNKNOWN>.
- Is there a fix for CVE-2026-63020?
- 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-2026-63020 attacked?
- It is attacked over the network, in a network appliance.
- Am I affected by CVE-2026-63020?
- 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
This is a reflected cross-site scripting (XSS) or HTML injection vulnerability in an undisclosed BIG-IP Configuration utility web page that allows an attacker to inject and display spoofed error messages. The vulnerability requires an authenticated user and is triggered via a malicious link (phishing/social engineering attack vector). An attacker cannot directly exploit this without user interaction—the victim must be tricked into visiting a crafted URL. The impact is limited to the control plane (management interface); the data plane and active traffic forwarding are not affected. F5 has published the vulnerability with low severity (CVSS 3.1).
Affected products
- F5 BIG-IP <UNKNOWN>
Timeline
- 2026-09-02: disclosed