CVE-2026-29859

CriticalPublic PoC

Published: 18 March 2026

Published

18 March 2026

Modified

23 March 2026

KEV Added

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Patch

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CVSS Score v3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Score 0.0051 39.5th percentile

Risk Priority 70 floored blend · peak EPSS

Summary

CVE-2026-29859 is a critical-severity Cross-site Scripting (CWE-79) vulnerability in Aapanel Aapanel. Its CVSS base score is 9.8 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 39.5th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-2 (Flaw Remediation).

Deeper analysis

CVE-2026-29859 is an arbitrary file upload vulnerability in aaPanel version 7.57.0 that enables attackers to execute arbitrary code by uploading a crafted file. Published on 2026-03-18T18:16:27.347, 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 maps to CWE-79 and CWE-434.

The vulnerability can be exploited by remote attackers with no required privileges or user interaction, accessible over the network with low attack complexity and no change in scope. Successful exploitation allows high-impact compromise of confidentiality, integrity, and availability through arbitrary code execution on the affected aaPanel instance.

Details on advisories, patches, and further technical analysis are available in the aaPanel GitHub repository at https://github.com/aapanel/aapanel and the vulnerability research repository at https://github.com/mbiesiad/vulnerability-research/tree/main/CVE-2026-29859.

OWASP Top 10 for Web (2025)

EU & UK References

🇪🇺 ENISA EUVD: EUVD-2026-12921

Vulnerability details

An arbitrary file upload vulnerability in aaPanel v7.57.0 allows attackers to execute arbitrary code via uploading a crafted file.

CWE(s): CWE-79 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?

Arbitrary file upload vulnerability in public-facing web application (aaPanel) enables remote unauthenticated code execution, directly facilitating T1190: Exploit Public-Facing Application.

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