What’s Vulnerable › Vulnerabilities
CVE-2026-111255: affiliate-toolkit <= 3.9.2 - Authenticated (Contributor+) Arbitrary File Upload via 'atkp_product_largeimageurl' Parameter
- Severity: high (CVSS 7.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.5% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-10-28 · updated 2026-10-28
- Weakness: CWE-434
Description
The affiliate-toolkit – Multi-Network Affiliate & Amazon Product Display plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 3.9.2 via the upload_image function. This is due to insufficient file type validation in upload_image due to a weak Content-Type prefix check and extension derivation from the attacker-controlled URL path, with no dangerous-extension stripping. This makes it possible for authenticated attackers, with contributor-level access and above, to upload files that may be executable, which makes remote code execution possible. Exploitation requires the "import product image" option to be enabled in the plugin settings, as this activates the image download pipeline triggered on product post save.
Affected products
References
- https://plugins.trac.wordpress.org/browser/affiliate-toolkit-starter/tags/3.9.2/includes/atkp_posttypes_product.php#L3192
- https://plugins.trac.wordpress.org/browser/affiliate-toolkit-starter/tags/3.9.2/includes/basics/ATKPTools.php#L546
- https://plugins.trac.wordpress.org/browser/affiliate-toolkit-starter/tags/3.9.2/includes/basics/ATKPTools.php#L657
- https://plugins.trac.wordpress.org/browser/affiliate-toolkit-starter/tags/3.9.2/includes/basics/ATKPTools.php#L710
- https://plugins.trac.wordpress.org/browser/affiliate-toolkit-starter/tags/3.9.2/includes/dataservices/atkp_productservice.php#L775
- https://plugins.trac.wordpress.org/changeset?reponame=&old=3759575%40affiliate-toolkit-starter&new=3759575%40affiliate-toolkit-starter
- https://www.wordfence.com/threat-intel/vulnerabilities/id/272a8ee4-8689-4935-89c5-e2f502621511?source=cve
Get alerted when CVE-2026-111255 or the next vulnerability affects your stack