CVE-2025-12673

Critical

Published: 06 December 2025

Published

06 December 2025

Modified

15 April 2026

KEV Added

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Patch

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CVSS Score 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Score 0.0037 59.1th percentile

Risk Priority 20 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2025-12673 is a critical-severity Unrestricted Upload of File with Dangerous Type (CWE-434) vulnerability in Wordpress (inferred from references). Its CVSS base score is 9.8 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 40.9% of CVEs by exploit likelihood; 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).

Threat & Defense at a Glance

What attackers do: exploitation maps to Exploit Public-Facing Application (T1190). What defenders deploy: see the NIST 800-53 controls recommended below.

Threat & Defense Details

Mitigating Controls (NIST 800-53 r5)AI

SI-2 Flaw Remediation good match

prevent

Requires timely patching of the vulnerable Flex QR Code Generator plugin up to version 1.2.7, directly eliminating the arbitrary file upload flaw in update_qr_code().

SI-10 Information Input Validation good match

prevent

Enforces validation of file types and contents for uploads, directly countering the missing file type validation that enables arbitrary file uploads.

SI-3 Malicious Code Protection good match

preventdetect

Scans and blocks malicious code in uploaded files at entry points, mitigating remote code execution from arbitrary uploads even if validation fails.

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 →

Why these techniques?

Arbitrary file upload vulnerability in a public-facing WordPress plugin directly enables exploitation of public-facing applications (T1190) for remote code execution via unauthenticated file upload.

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

NVD Description

The Flex QR Code Generator plugin for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in the update_qr_code() function in all versions up to, and including, 1.2.7. This makes it possible for unauthenticated attackers to…

upload arbitrary files on the affected site's server which may make remote code execution possible.

Deeper analysisAI

CVE-2025-12673 is an arbitrary file upload vulnerability in the Flex QR Code Generator plugin for WordPress, affecting all versions up to and including 1.2.7. The flaw arises from missing file type validation in the update_qr_code() function, classified under CWE-434. It carries a CVSS v3.1 base score of 9.8 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H), indicating critical severity due to its potential for high-impact confidentiality, integrity, and availability effects.

Unauthenticated attackers can exploit this vulnerability remotely with low complexity and no user interaction or privileges required. By leveraging the deficient validation, they can upload arbitrary files to the affected site's server, which may enable remote code execution depending on server configuration and file types processed.

Advisories and patch information are detailed in references such as the Wordfence threat intelligence page, WordPress plugin trac changeset 3412218, and researcher analyses on GitHub (d0n601/CVE-2025-12673) and ryankozak.com. Mitigation centers on updating the plugin beyond version 1.2.7 to address the validation gap.