CVE-2026-18143: CWE-434 Unrestricted Upload of File with Dangerous Type in Addify Request a Quote for WooCommerce
The Request a Quote for WooCommerce WordPress plugin versions up to and including 2.9.2 contains an arbitrary file upload vulnerability. This flaw allows unauthenticated attackers to upload executable files, such as PHP scripts, due to missing validation of file extensions and MIME types in the popup upload handler. The vulnerability arises from the use of the raw attacker-supplied filename in the move_uploaded_file() function, enabling potential remote code execution if the uploaded file is accessed. The issue affects installations with a public quote rule and multi-page popup flow enabled.
AI Analysis
Technical Summary
CVE-2026-18143 is an arbitrary file upload vulnerability in the Request a Quote for WooCommerce plugin for WordPress, present in all versions up to and including 2.9.2. The vulnerability exists because the afrfq_submit_quote_via_popup() function does not validate file extensions or MIME types before saving uploaded files. Attackers can upload executable files directly to a web-accessible temporary upload directory by supplying a crafted filename, potentially leading to remote code execution. This occurs when a public quote rule with the multi-page popup flow is enabled, allowing unauthenticated users to exploit the flaw.
Potential Impact
Successful exploitation allows unauthenticated attackers to upload and execute arbitrary files on the affected server, leading to full compromise including confidentiality, integrity, and availability impacts. The CVSS score of 9.8 reflects critical severity with network attack vector, no privileges or user interaction required, and high impact on confidentiality, integrity, and availability.
Mitigation Recommendations
No official patch or fix is currently documented. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, it is recommended to disable the public quote rule with multi-page popup flow or restrict file upload capabilities to trusted users only. Monitoring and restricting access to the temporary upload directory may reduce risk. Avoid exposing the upload directory to the web if possible.
CVE-2026-18143: CWE-434 Unrestricted Upload of File with Dangerous Type in Addify Request a Quote for WooCommerce
Description
The Request a Quote for WooCommerce WordPress plugin versions up to and including 2.9.2 contains an arbitrary file upload vulnerability. This flaw allows unauthenticated attackers to upload executable files, such as PHP scripts, due to missing validation of file extensions and MIME types in the popup upload handler. The vulnerability arises from the use of the raw attacker-supplied filename in the move_uploaded_file() function, enabling potential remote code execution if the uploaded file is accessed. The issue affects installations with a public quote rule and multi-page popup flow enabled.
CVSS v3.1
Score 9.8critical
Affected software
Addify
Request a Quote for WooCommerce
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-18143 is an arbitrary file upload vulnerability in the Request a Quote for WooCommerce plugin for WordPress, present in all versions up to and including 2.9.2. The vulnerability exists because the afrfq_submit_quote_via_popup() function does not validate file extensions or MIME types before saving uploaded files. Attackers can upload executable files directly to a web-accessible temporary upload directory by supplying a crafted filename, potentially leading to remote code execution. This occurs when a public quote rule with the multi-page popup flow is enabled, allowing unauthenticated users to exploit the flaw.
Potential Impact
Successful exploitation allows unauthenticated attackers to upload and execute arbitrary files on the affected server, leading to full compromise including confidentiality, integrity, and availability impacts. The CVSS score of 9.8 reflects critical severity with network attack vector, no privileges or user interaction required, and high impact on confidentiality, integrity, and availability.
Mitigation Recommendations
No official patch or fix is currently documented. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, it is recommended to disable the public quote rule with multi-page popup flow or restrict file upload capabilities to trusted users only. Monitoring and restricting access to the temporary upload directory may reduce risk. Avoid exposing the upload directory to the web if possible.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Wordfence
- Date Reserved
- 2026-07-28T18:54:42.563Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ab76ab1f7a7c54106fb6110
Added to database: 09/26/2026, 06:48:17 UTC
Last enriched: 09/26/2026, 07:02:40 UTC
Last updated: 09/26/2026, 07:32:37 UTC
Views: 37
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.