CVE-2026-1021

Critical

Published: 16 January 2026

Published

16 January 2026

Modified

23 January 2026

KEV Added

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Patch

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CVSS Score v4 9.3 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Score 0.0064 45.8th percentile

Risk Priority 70 floored blend · peak EPSS

Summary

CVE-2026-1021 is a critical-severity Unrestricted Upload of File with Dangerous Type (CWE-434) vulnerability in Gotac Police Statistics Database System. Its CVSS base score is 9.3 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 45.8th 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 AC-3 (Access Enforcement) and SI-10 (Information Input Validation).

Deeper analysis

CVE-2026-1021 is an Arbitrary File Upload vulnerability (CWE-434) affecting the Police Statistics Database System developed by Gotac. Published on 2026-01-16, 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 remote exploitation without authentication or user interaction.

An unauthenticated remote attacker can exploit this vulnerability over the network with low complexity to upload web shell backdoors. Successful exploitation enables arbitrary code execution on the server, granting high levels of confidentiality, integrity, and availability impact.

Mitigation details and advisories are provided by TWCERT at https://www.twcert.org.tw/en/cp-139-10638-0e44b-2.html and https://www.twcert.org.tw/tw/cp-132-10637-3e4b3-1.html.

OWASP Top 10 for Web (2025)

EU & UK References

🇪🇺 ENISA EUVD: EUVD-2026-2985

Vulnerability details

Police Statistics Database System developed by Gotac has an Arbitrary File Upload vulnerability, allowing unauthenticated remote attacker to upload and execute web shell backdoors, thereby enabling arbitrary code execution on the server.

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 vulnerability on a public-facing web application directly enables unauthenticated web shell deployment (T1505.003) and remote exploitation of the exposed server (T1190).

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