CVE-2026-111255
affiliate-toolkit <= 3.9.2 - Authenticated (Contributor+) Arbitrary File Upload via 'atkp_product_largeimageurl' Parameter
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.
INFO
Published Date :
Oct. 28, 2026, 4:17 a.m.
Last Modified :
Oct. 28, 2026, 4:17 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | MITRE-CVE | ||||
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update the affiliate-toolkit plugin to the latest version.
- Enable the 'import product image' option carefully.
- Validate file types during uploads.
- Strip dangerous extensions from filenames.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-111255.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-111255 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-111255
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-111255 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-111255 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by [email protected]
Oct. 28, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H Added CWE CWE-434 Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/111xxx/CVE-2026-111255.json">CVE-2026-111255</a> Added Reference https://plugins.trac.wordpress.org/browser/affiliate-toolkit-starter/tags/3.9.2/includes/atkp_posttypes_product.php#L3192 Added Reference https://plugins.trac.wordpress.org/browser/affiliate-toolkit-starter/tags/3.9.2/includes/basics/ATKPTools.php#L546 Added Reference https://plugins.trac.wordpress.org/browser/affiliate-toolkit-starter/tags/3.9.2/includes/basics/ATKPTools.php#L657 Added Reference https://plugins.trac.wordpress.org/browser/affiliate-toolkit-starter/tags/3.9.2/includes/basics/ATKPTools.php#L710 Added Reference https://plugins.trac.wordpress.org/browser/affiliate-toolkit-starter/tags/3.9.2/includes/dataservices/atkp_productservice.php#L775 Added Reference https://plugins.trac.wordpress.org/changeset?reponame=&old=3759575%40affiliate-toolkit-starter&new=3759575%40affiliate-toolkit-starter Added Reference https://www.wordfence.com/threat-intel/vulnerabilities/id/272a8ee4-8689-4935-89c5-e2f502621511?source=cve