Pix for WooCommerce <= 1.5.0 - Unauthenticated Arbitrary File Upload
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-434.
Summary
The Pix for WooCommerce plugin for WordPress is vulnerable to arbitrary file uploads due to missing capability check and missing file type validation in the 'lkn_pix_for_woocommerce_c6_save_settings' function in all versions up to, and including, 1.5.0. This makes it possible for unauthenticated attackers to upload arbitrary files on the affected site's server which may make remote code execution possible.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| linknacional | Pix for WooCommerce | up to 1.5.0 | — | No fix listed | CNA |
- Pix for WooCommerce Vendorlinknacional Affected up to 1.5.0 Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-3891
- 2026-10-03 Alias added: GHSA-fpj4-w3j6-3v3w
References
Other 3
- https://www.wordfence.com/threat-intel/vulnerabilities/id/20188fd3-c330-4c76-912b-72731e14c450?source=cve
- https://plugins.trac.wordpress.org/browser/payment-gateway-pix-for-woocommerce/tags/1.4.0/Includes/LknPaymentPixForWoocommercePixC6.php#L694
- https://plugins.trac.wordpress.org/changeset/3480639/payment-gateway-pix-for-woocommerce#file56
More linknacional vulnerabilities
- TI-2024-36416 WordPress Invoice Payment for WooCommerce plugin <= 1.7.2 - Reflected Cross Site Scripting (XSS) vulnerability CVSS 3.1HIGH 7.1
- TI-2026-00710 Missing authentication in linknacional Rede Itaú for WooCommerce — Payment PIX, Credit… CVSS 3.1MEDIUM 5.3
- TI-2026-24953 WordPress Payment Gateway Pix For GiveWP plugin <= 2.2.3 - Broken Access Control vulnerability CVSS 3.1MEDIUM 5.3
- TI-2026-00708 Rede Itaú for WooCommerce — Payment PIX, Credit Card and Debit <= 5.1.2 - Unauthenticated Order Status Manipulation CVSS 3.1MEDIUM 5.3
- TI-2025-13655 Missing authorization in linknacional Link Invoice Payment for WooCommerce CVSS 3.1MEDIUM 5.3
Sources
- CVE-2026-3891 · CVE Program
- CVE-2026-3891 · NVD
- FIRST EPSS
- GHSA-fpj4-w3j6-3v3w · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences