CVE-2026-1358

Critical

Published: 12 February 2026

Published

12 February 2026

Modified

15 April 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 0.0121 64.4th percentile

Risk Priority 70 floored blend · peak EPSS

Summary

CVE-2026-1358 is a critical-severity Unrestricted Upload of File with Dangerous Type (CWE-434) vulnerability in Airleader Master (inferred from references). Its CVSS base score is 9.3 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 35.6% 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 AC-6 (Least Privilege) and IA-8 (Identification and Authentication (Non-organizational Users)).

Deeper analysis

CVE-2026-1358 is an unrestricted file upload vulnerability (CWE-434) in Airleader Master versions 6.381 and prior. It affects multiple webpages running with maximum privileges, enabling file uploads without restrictions. Published on 2026-02-12, the flaw 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 remote code execution on the affected server.

An unauthenticated attacker with network access can exploit this low-complexity vulnerability without requiring user interaction. Successful exploitation allows the attacker to upload malicious files, potentially achieving remote code execution on the server with high impacts to confidentiality, integrity, and availability.

Mitigation guidance is available in vendor and third-party advisories, including CISA ICSA-26-043-10 (https://www.cisa.gov/news-events/ics-advisories/icsa-26-043-10), SYSS-2025-044 (https://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2025-044.txt), and the CSAF document at https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-043-10.json. Security practitioners should review these for patching instructions and workarounds, along with contacting the vendor via https://airleader.us/contact/.

OWASP Top 10 for Web (2025)

EU & UK References

🇪🇺 ENISA EUVD: EUVD-2026-6159

Vulnerability details

Airleader Master versions 6.381 and prior allow for file uploads without restriction to multiple webpages running maximum privileges. This could allow an unauthenticated user to potentially obtain remote 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 →

Why these techniques?

CVE-2026-1358 enables unauthenticated attackers to exploit a public-facing web application via unrestricted file upload, achieving remote code execution, which directly maps to T1190: Exploit Public-Facing Application.

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