CVE-2026-21628

Critical

Published: 05 March 2026

Published

05 March 2026

Modified

13 March 2026

KEV Added

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Patch

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CVSS Score v4 10.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:A/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:Y/R:X/V:X/RE:X/U:X

EPSS Score 0.0047 37.1th percentile

Risk Priority 70 floored blend · peak EPSS

Summary

CVE-2026-21628 is a critical-severity Unrestricted Upload of File with Dangerous Type (CWE-434) vulnerability in Templaza Astroid Framework. Its CVSS base score is 10.0 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 37.1th 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-2026-21628 is a vulnerability in an improperly secured file management feature that allows unauthenticated users to upload dangerous data types, leading to remote code execution. Published on 2026-03-05, 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) and is categorized under CWE-434.

Unauthenticated attackers with network access can exploit this vulnerability with low complexity and no user interaction required. Successful exploitation enables remote code execution, granting high levels of confidentiality, integrity, and availability impact on the affected system.

Mitigation details are available in the referenced advisory at https://astroidframe.work.

OWASP Top 10 for Web (2025)

EU & UK References

🇪🇺 ENISA EUVD: EUVD-2026-9816

Vulnerability details

A improperly secured file management feature allows uploads of dangerous data types for unauthenticated users, leading to remote code execution.

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 →

Why these techniques?

The vulnerability allows unauthenticated remote code execution via exploitation of a public-facing file management feature, directly mapping to T1190: Exploit Public-Facing Application.

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