What is CVE-2026-3891?

CVE-2026-3891 is a critical-severity vulnerability in Linknacional Pix For Woocommerce, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.8/10. Published 2026-03-13.

How severe is CVE-2026-3891?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2026-3891 known to be exploited?

4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Arbitrary file upload in Linknacional Pix For Woocommerce

CVE-2026-3891

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 inc…

Vulnerability class: Unrestricted File Upload

EPSS: 0.001 (24.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Linknacional Pix For Woocommerce — versions 0

Weakness classification (CWE)

CWE-434 — Unrestricted Upload of File with Dangerous Type

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2026-3891?: CVE-2026-3891 is a critical-severity vulnerability in Linknacional Pix For Woocommerce, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.8/10. Published 2026-03-13.
How severe is CVE-2026-3891?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2026-3891 known to be exploited?: 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.