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 plugin for WordPress contains a critical arbitrary file upload vulnerability (CWE-434) in all versions up to and including 2.9.2. The flaw exists in the afrfq_submit_quote_via_popup() function, which lacks proper validation of file extensions and MIME types. This allows unauthenticated attackers to upload executable files, such as PHP scripts, to a web-accessible temporary upload directory when a public quote rule with multi-page popup flow is enabled.
AI Analysis
Technical Summary
CVE-2026-18143 is an arbitrary file upload vulnerability in the Request a Quote for WooCommerce WordPress plugin (up to version 2.9.2). The vulnerability arises from the `afrfq_submit_quote_via_popup()` function, which fails to validate file extensions and MIME types before using the attacker-supplied filename in `move_uploaded_file()`. This allows unauthenticated attackers to upload executable files to a web-accessible temporary upload directory, potentially leading to remote code execution or site compromise when the public quote rule with multi-page popup flow is enabled.
Potential Impact
Successful exploitation allows unauthenticated attackers to upload and execute arbitrary files on the affected server, leading to full compromise of the WordPress site, including confidentiality, integrity, and availability impacts. The CVSS score of 9.8 reflects the critical severity and ease of exploitation without authentication.
Mitigation Recommendations
No patch or official fix information is currently available. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is released, it is recommended to disable the public quote rule with multi-page popup flow feature or restrict access to the upload directory to prevent exploitation.
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 plugin for WordPress contains a critical arbitrary file upload vulnerability (CWE-434) in all versions up to and including 2.9.2. The flaw exists in the afrfq_submit_quote_via_popup() function, which lacks proper validation of file extensions and MIME types. This allows unauthenticated attackers to upload executable files, such as PHP scripts, to a web-accessible temporary upload directory when a public quote rule with multi-page popup flow is enabled.
CVSS v3.1
Score 9.8critical
Affected software
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 WordPress plugin (up to version 2.9.2). The vulnerability arises from the `afrfq_submit_quote_via_popup()` function, which fails to validate file extensions and MIME types before using the attacker-supplied filename in `move_uploaded_file()`. This allows unauthenticated attackers to upload executable files to a web-accessible temporary upload directory, potentially leading to remote code execution or site compromise when the public quote rule with multi-page popup flow is enabled.
Potential Impact
Successful exploitation allows unauthenticated attackers to upload and execute arbitrary files on the affected server, leading to full compromise of the WordPress site, including confidentiality, integrity, and availability impacts. The CVSS score of 9.8 reflects the critical severity and ease of exploitation without authentication.
Mitigation Recommendations
No patch or official fix information is currently available. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is released, it is recommended to disable the public quote rule with multi-page popup flow feature or restrict access to the upload directory to prevent exploitation.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-f78j-xwc8-gq3q
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-18143"]
- Database Specific Severity
- CRITICAL
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ab89bf1f7a7c541069421e4
Added to database: 09/27/2026, 04:30:41 UTC
Last enriched: 09/27/2026, 04:46:26 UTC
Last updated: 09/27/2026, 05:09:00 UTC
Views: 4
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