CVE-2026-13604 Pixelavo < 1.5.4 - Unauthenticated Facebook CAPI Event Injection via pixelavo_event AJAX
Unauthenticated attackers can inject arbitrary Facebook conversion events and exhaust API quotas via an exposed AJAX endpoint in the Pixelavo plugin.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-13604?
CVE-2026-13604 is a medium-severity server-side request forgery vulnerability in Unknown Pixelavo, published on 1 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The Pixelavo WordPress plugin before 1.5.4 registers an unauthenticated AJAX action, gated only by a nonce that it emits publicly on every front-end page, that forwards client-supplied event data to the configured Facebook Conversions API using the administrator's stored access token. This allows an unauthenticated visitor to inject arbitrary conversion events into the administrator's Facebook ads account and exhaust the configured API quota.
Weakness: CWE-918
Which versions are affected by CVE-2026-13604?
How do I fix CVE-2026-13604?
No fix has been published for CVE-2026-13604 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-13604 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-13604 exists.
Sources
Also known as GHSA-gm56-v4px-r8mh.