CVE-2026-18143 Request a Quote for WooCommerce <= 2.9.2 - Unauthenticated Arbitrary File Upload via AJAX Popup Handler
Unauthenticated attackers can upload executable PHP files to achieve remote code execution if the multi-page popup quote flow is enabled.
- 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-2026-18143?
CVE-2026-18143 is a critical vulnerability in Addify Request a Quote for WooCommerce, published on 26 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The Request a Quote for WooCommerce plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 2.9.2 via the `afrfq_submit_quote_via_popup()` function. This is due to missing file extension and MIME type validation in the popup upload handler, which uses the raw attacker-supplied filename directly as the destination for `move_uploaded_file()`. This makes it possible for unauthenticated attackers to upload executable files, such as PHP files, to a web-accessible temporary RFQ upload directory when a public quote rule with the multi-page popup flow is enabled.
Weakness: CWE-434
Which versions are affected by CVE-2026-18143?
How do I fix CVE-2026-18143?
No fix has been published for CVE-2026-18143 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-18143 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-18143 exists.
Public exploit code: 1 Nuclei template and 2 proofs of concept on GitHub.
Sources
Also known as GHSA-f78j-xwc8-gq3q.