linknacional Pix for WooCommerce Plugin up to 1.5.0 on WordPress Setting lkn_pix_for_woocommerce_c6_save_settings unrestricted upload

CVSS Meta Temp Score
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CTI Interest Score
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8.2$0-$5k0.00

Summaryinfo

A vulnerability was found in linknacional Pix for WooCommerce Plugin up to 1.5.0 on WordPress. It has been rated as critical. The impacted element is the function lkn_pix_for_woocommerce_c6_save_settings of the component Setting Handler. The manipulation leads to unrestricted upload. This vulnerability is traded as CVE-2026-3891. It is possible to initiate the attack remotely. Furthermore, there is an exploit available.

Detailsinfo

A vulnerability was found in linknacional Pix for WooCommerce Plugin up to 1.5.0 on WordPress. It has been rated as critical. This issue affects the function lkn_pix_for_woocommerce_c6_save_settings of the component Setting Handler. The manipulation with an unknown input leads to a unrestricted upload vulnerability. Using CWE to declare the problem leads to CWE-434. The product allows the attacker to upload or transfer files of dangerous types that can be automatically processed within the product's environment. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

The weakness was shared by Alexis Lafontaine. It is possible to read the advisory at wordfence.com. The identification of this vulnerability is CVE-2026-3891 since 03/10/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details as well as a public exploit are known. The attack technique deployed by this issue is T1608.002 according to MITRE ATT&CK.

The exploit is available at exploit-db.com. It is declared as proof-of-concept.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at Exploit-DB (52642) and EUVD (EUVD-2026-11760). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

Vendor

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.5
VulDB Meta Temp Score: 8.2

VulDB Base Score: 7.3
VulDB Temp Score: 6.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 9.8
CNA Vector (Wordfence): 🔒

CVSSv2info

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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Unrestricted upload
CWE: CWE-434 / CWE-284 / CWE-266
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Access: Public
Status: Proof-of-Concept
Download: 🔒

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Exploit-DB: 🔒

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

03/10/2026 CVE reserved
03/13/2026 +3 days Advisory disclosed
03/13/2026 +0 days VulDB entry created
08/20/2026 +159 days VulDB entry last update

Sourcesinfo

Advisory: wordfence.com
Researcher: Alexis Lafontaine
Status: Not defined

CVE: CVE-2026-3891 (🔒)
GCVE (CVE): GCVE-0-2026-3891
GCVE (VulDB): GCVE-100-350819
EUVD: 🔒
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 03/13/2026 08:58
Updated: 08/20/2026 01:53
Changes: 03/13/2026 08:58 (66), 03/14/2026 00:08 (1), 08/20/2026 01:53 (11)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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