CVE-2026-7490

High

Published: 02 May 2026

Published

02 May 2026

Modified

05 May 2026

KEV Added

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Patch

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CVSS Score 7.2 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

EPSS Score 0.0028 51.2th percentile

Risk Priority 15 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-7490 is a high-severity Unrestricted Upload of File with Dangerous Type (CWE-434) vulnerability in Org (inferred from references). Its CVSS base score is 7.2 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 48.8% 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) and 1 other technique. 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

Timely identification, reporting, and correction of software flaws directly patches the arbitrary file upload vulnerability in CTMS and CPAS, eliminating the root cause of CVE-2026-7490.

SI-10 Information Input Validation good match

prevent

Validates all inputs including uploaded files to block arbitrary file uploads that enable web shell execution and arbitrary code execution.

SI-9 Information Input Restrictions good match

prevent

Restricts classes of uploaded files to only authorized types, preventing privileged attackers from uploading executable web shells.

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?

The arbitrary file upload vulnerability allows privileged remote attackers to upload and execute web shell backdoors on a public-facing application, directly enabling T1190 (Exploit Public-Facing Application) for initial/remote exploitation and T1505.003 (Web Shell) for persistent code execution.

Confidence: HIGH · MITRE ATT&CK Enterprise v18.1

NVD Description

CTMS and CPAS developed by Sunnet has an Arbitrary File Upload vulnerability, allowing privileged remote attackers to upload and execute web shell backdoors, thereby enabling arbitrary code execution on the server.

Deeper analysisAI

CVE-2026-7490 is an Arbitrary File Upload vulnerability (CWE-434) in CTMS and CPAS, software developed by Sunnet. Published on 2026-05-02, it carries a CVSS v3.1 base score of 7.2 (AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H). The issue enables privileged remote attackers to upload and execute web shell backdoors, resulting in arbitrary code execution on the server.

Attackers require high privileges (PR:H) but can exploit the vulnerability remotely over the network (AV:N) with low attack complexity (AC:L) and no user interaction (UI:N). Successful exploitation achieves high impacts on confidentiality, integrity, and availability (C:H/I:H/A:H) within the unchanged scope (S:U), allowing full server compromise through persistent web shells.

Advisories from TWCERT/CC detail the vulnerability at https://www.twcert.org.tw/en/cp-139-10895-25ca1-2.html and https://www.twcert.org.tw/tw/cp-132-10894-1ac1f-1.html.