Cyber Resilience

CVE-2026-28114

Critical

Published: 05 March 2026

Published
05 March 2026
Modified
22 April 2026
KEV Added
—
Patch
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CVSS Score v3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
EPSS Score 0.0028 19.3th percentile
Risk Priority 70 floored blend · peak EPSS

Summary

CVE-2026-28114 is a critical-severity Unrestricted Upload of File with Dangerous Type (CWE-434) vulnerability. Its CVSS base score is 9.1 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 19.3th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-2 (Flaw Remediation).

Deeper analysis

CVE-2026-28114 is an Unrestricted Upload of File with Dangerous Type vulnerability (CWE-434) in the firassaidi WooCommerce License Manager plugin, known as fs-license-manager, for WordPress. The flaw enables the upload of a web shell to the web server. It affects WooCommerce License Manager versions from n/a through 7.0.6 and was published on 2026-03-05.

The vulnerability carries a CVSS v3.1 base score of 9.1 (AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H). High-privileged users, such as administrators with required permissions, can exploit it remotely over the network with low complexity and no user interaction. Successful exploitation allows uploading dangerous files like web shells, leading to high-impact compromise of confidentiality, integrity, and availability across a changed scope, potentially enabling remote code execution and full server control.

The Patchstack advisory at https://patchstack.com/database/Wordpress/Plugin/fs-license-manager/vulnerability/wordpress-woocommerce-license-manager-plugin-6-0-5-arbitrary-file-upload-vulnerability?_s_id=cve details this arbitrary file upload issue.

OWASP Top 10 for Web (2025)

A06:2025 Insecure Design

EU & UK References

Vulnerability details

Unrestricted Upload of File with Dangerous Type vulnerability in firassaidi WooCommerce License Manager fs-license-manager allows Upload a Web Shell to a Web Server.This issue affects WooCommerce License Manager: from n/a through <= 7.0.6.

CWE(s)
CWE-434

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
T1505.003 Web Shell Persistence
Adversaries may backdoor web servers with web shells to establish persistent access to systems.
attack.mitre.org →
Why these techniques?

Arbitrary file upload (CWE-434) in public-facing WordPress plugin directly enables web shell deployment (T1505.003) for RCE and full server compromise; also maps to exploitation of public-facing application (T1190).

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0

CVEs Like This One

CVE-2025-22654Shared CWE-434
CVE-2025-11948Shared CWE-434
CVE-2025-67260Shared CWE-434
CVE-2025-28915Shared CWE-434
CVE-2023-53956Shared CWE-434
CVE-2025-6058Shared CWE-434
CVE-2021-47819Shared CWE-434
CVE-2025-7852Shared CWE-434
CVE-2026-4883Shared CWE-434
CVE-2019-25630Shared CWE-434

Affected Assets

Mitigating Controls

Mitigating Controls (NIST 800-53 r5) AI

SI-2 Flaw Remediation good match
prevent

Directly requires timely remediation and patching of the specific unrestricted file upload flaw in the WooCommerce License Manager plugin to prevent exploitation.

SI-10 Information Input Validation good match
prevent

Mandates validation of uploaded file content, types, and formats to block dangerous files like web shells from being accepted by the vulnerable plugin.

SI-9 Information Input Restrictions good match
prevent

Restricts and filters unauthorized information inputs such as executable or dangerous file types targeted by the CVE's unrestricted upload mechanism.

References