CVE-2026-7490
Published: 02 May 2026
Summary
CVE-2026-7490 is a high-severity Unrestricted Upload of File with Dangerous Type (CWE-434) vulnerability in Sun.Net Ehrd Cpas. Its CVSS base score is 8.6 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 37.0th 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-2026-7490 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.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-26770
Vulnerability details
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.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
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.
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Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
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.
Validates all inputs including uploaded files to block arbitrary file uploads that enable web shell execution and arbitrary code execution.
Restricts classes of uploaded files to only authorized types, preventing privileged attackers from uploading executable web shells.