---
id: "CVE-2026-109987"
kind: "vulnerability"
aliases: ["CVE-2026-109987"]
title: "PixelYourSite WordPress plugins: cookie value stored XSS via full-page cache"
severity: "high"
cvss: 7.2
epss: 0.00183
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["full-page-cache", "package", "pixelyoursite", "wordpress", "wordpress-plugins"]
not_affected_if: ["no-full-page-cache", "plugin-up-to-date"]
published_at: "2026-10-22T06:17:13+00:00"
first_seen_at: "2026-10-23T21:57:30+00:00"
updated_at: "2026-10-25T03:27:53+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-109987", "first_seen_at": "2026-10-23T21:57:30+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-109987", "first_seen_at": "2026-10-24T07:15:52+00:00"}]
---

# PixelYourSite WordPress plugins: cookie value stored XSS via full-page cache

The PixelYourSite and PixelYourSite Pro WordPress plugins print a cookie value into page output without sanitising or escaping it. On sites with full-page caching, an unauthenticated attacker can get a script stored in the cached page and served to other visitors.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed version of PixelYourSite and PixelYourSite Pro in the WordPress plugins list or `wp plugin list --name=pixelyoursite --fields=name,version` and `wp plugin list --name=pixelyoursite-pro --fields=name,version`
- Check whether a full-page cache (for example a caching plugin or host-level page cache) is serving pages to anonymous visitors

## Fix

- Update PixelYourSite to `11.4.3` or later
- Update PixelYourSite Pro to `12.6.8` or later
- Purge the full-page cache after updating so that any previously stored payload is removed

## Timeline

- 2026-10-23T21:57:30+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-109987
- 2026-10-24T07:15:52+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-109987

## From the sources

The PixelYourSite  WordPress plugin before 11.4.3, PixelYourSite Pro WordPress plugin before 12.6.8 do not sanitise and escape a cookie value before printing it into the page output, which, on a site running a full-page cache, allows unauthenticated attackers to store a Cross-Site Scripting payload in the cached page that is then served to other visitors.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_