CVE-2026-3891 — AI Deep Analysis Summary

Q: What is this vulnerability? (Essence + Consequences)

🚨 **Essence**: A critical code flaw in 'Pix for WooCommerce' plugin. 📉 **Consequences**: Complete compromise of the WordPress site. High impact on Confidentiality, Integrity, and Availability.

Q: Root Cause? (CWE/Flaw)

🛡️ **Root Cause**: Missing capability checks & file type validation. 🧠 **CWE**: CWE-434 (Unrestricted Upload of File with Dangerous Type). The function `lkn_pix_for_woocommerce_c6_save_settings` is vulnerable.

Q: Who is affected? (Versions/Components)

🎯 **Affected**: WordPress Plugin: **Pix for WooCommerce**. 📦 **Version**: 1.5.0 and earlier. 🏢 **Vendor**: linknacional.

Q: What can hackers do? (Privileges/Data)

💀 **Attacker Actions**: Upload malicious files (Webshells). 🔓 **Privileges**: Full server access. 📂 **Data**: Steal sensitive DB data, modify site content, or take down the server.

Q: Is exploitation threshold high? (Auth/Config)

⚡ **Threshold**: LOW. 🚫 **Auth**: None required (PR:N). 🌐 **Network**: Remote (AV:N). 🎭 **UI**: No interaction needed (UI:N). Easy to exploit remotely.

Q: Is there a public Exp? (PoC/Wild Exploitation)

🔍 **Exploit Status**: No public PoC listed in data. 📰 **References**: WordFence & WP Trac links exist. ⚠️ **Risk**: High likelihood of wild exploitation due to low barrier.

Q: How to self-check? (Features/Scanning)

🔎 **Check**: Scan for 'Pix for WooCommerce' plugin. 📋 **Version**: Verify if version <= 1.5.0. 🛠️ **Tool**: Use WP vulnerability scanners or check plugin directory.

Q: Is it fixed officially? (Patch/Mitigation)

🩹 **Fix**: Update plugin to latest version. 📝 **Source**: WP Trac changeset 3480639 confirms fix. 🔄 **Action**: Immediate update recommended.

Q: What if no patch? (Workaround)

🚧 **No Patch?**: Disable the plugin immediately. 🛑 **Block**: Restrict file upload permissions via server config. 🧱 **WAF**: Block suspicious upload requests to `/Includes/`.

Q: Is it urgent? (Priority Suggestion)

🔥 **Priority**: CRITICAL. 🚨 **CVSS**: 9.8 (High). ⏳ **Urgency**: Patch NOW. Remote code execution risk is severe and unauthenticated.

Updated May 06, 2026 CVSS 9.8 · Critical

This is a summary of the AI-generated 10-question deep analysis. The full version (longer answers, follow-up Q&A, related CVEs) requires login. Read the full analysis →

Q1What is this vulnerability? (Essence + Consequences)

🚨 **Essence**: A critical code flaw in 'Pix for WooCommerce' plugin. 📉 **Consequences**: Complete compromise of the WordPress site. High impact on Confidentiality, Integrity, and Availability.

Q2Root Cause? (CWE/Flaw)

🛡️ **Root Cause**: Missing capability checks & file type validation. 🧠 **CWE**: CWE-434 (Unrestricted Upload of File with Dangerous Type). The function `lkn_pix_for_woocommerce_c6_save_settings` is vulnerable.

Q3Who is affected? (Versions/Components)

🎯 **Affected**: WordPress Plugin: **Pix for WooCommerce**. 📦 **Version**: 1.5.0 and earlier. 🏢 **Vendor**: linknacional.

Q4What can hackers do? (Privileges/Data)

💀 **Attacker Actions**: Upload malicious files (Webshells). 🔓 **Privileges**: Full server access. 📂 **Data**: Steal sensitive DB data, modify site content, or take down the server.

Q5Is exploitation threshold high? (Auth/Config)

⚡ **Threshold**: LOW. 🚫 **Auth**: None required (PR:N). 🌐 **Network**: Remote (AV:N). 🎭 **UI**: No interaction needed (UI:N). Easy to exploit remotely.

Q6Is there a public Exp? (PoC/Wild Exploitation)

🔍 **Exploit Status**: No public PoC listed in data. 📰 **References**: WordFence & WP Trac links exist. ⚠️ **Risk**: High likelihood of wild exploitation due to low barrier.

Q7How to self-check? (Features/Scanning)

🔎 **Check**: Scan for 'Pix for WooCommerce' plugin. 📋 **Version**: Verify if version <= 1.5.0. 🛠️ **Tool**: Use WP vulnerability scanners or check plugin directory.

Q8Is it fixed officially? (Patch/Mitigation)

🩹 **Fix**: Update plugin to latest version. 📝 **Source**: WP Trac changeset 3480639 confirms fix. 🔄 **Action**: Immediate update recommended.

Q9What if no patch? (Workaround)

🚧 **No Patch?**: Disable the plugin immediately. 🛑 **Block**: Restrict file upload permissions via server config. 🧱 **WAF**: Block suspicious upload requests to `/Includes/`.

Q10Is it urgent? (Priority Suggestion)

🔥 **Priority**: CRITICAL. 🚨 **CVSS**: 9.8 (High). ⏳ **Urgency**: Patch NOW. Remote code execution risk is severe and unauthenticated.

Continue exploring

Vulnerability detail Full AI analysis (login) linknacional CWE-434