CVE-2026-87760 Web Vitals Tracking <= 5.4.2 - Unauthenticated Stored XSS via Tracking Beacon Metric Name
Unauthenticated attackers can inject malicious scripts via tracking metrics, leading to stored XSS and potential admin account takeover.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-87760?
CVE-2026-87760 is a high-severity cross-site scripting vulnerability in Unknown Web Vitals Tracking, published on 11 Oct 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
The Web Vitals Tracking WordPress plugin through 5.4.2 does not validate or escape performance measurements submitted by unauthenticated visitors before storing them and outputting them in a script context on an administrative page, allowing unauthenticated attackers to perform Stored Cross-Site Scripting attacks against administrators.
Weakness: CWE-79
Which versions are affected by CVE-2026-87760?
How do I fix CVE-2026-87760?
No fix has been published for CVE-2026-87760 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-87760 being exploited?
There is no known exploitation of CVE-2026-87760 in the wild and no public exploit code.
Sources
Also known as GHSA-pwvc-4967-h5ch.