Cyber Posture

CVE-2026-46402

High
Microsoft: not affectedMSmacOS: not affectedMacLinux: not affectedLnxMobile: not affectedMobNetwork: not affectedNetApplication: not affectedAppOther: affectedOth

Published: 27 May 2026

Published
27 May 2026
Modified
28 May 2026
KEV Added
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Patch
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CVSS Score 8.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
EPSS Score 0.0006 17.9th percentile
Risk Priority 16 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-46402 is a high-severity Path Traversal (CWE-22) vulnerability. Its CVSS base score is 8.1 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Web Shell (T1100); ranked at the 17.9th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

Threat & Defense at a Glance

What attackers do: exploitation maps to Web Shell (T1100) and 1 other technique.
Threat & Defense Details

Likely Mitigating ControlsAI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

SI-10 Information Input Validation
addresses: CWE-22 CWE-73

Validates pathnames and filenames to prevent traversal outside intended directories.

MITRE ATT&CK Enterprise TechniquesAI

T1100 Web Shell Persistence
A Web shell is a Web script that is placed on an openly accessible Web server to allow an adversary to use the Web server as a gateway into a network.
attack.mitre.org →
T1547.001 Registry Run Keys / Startup Folder Persistence
Adversaries may achieve persistence by adding a program to a startup folder or referencing it with a Registry run key.
attack.mitre.org →
Why these techniques?

Path traversal enables arbitrary file/directory creation outside intended scope, directly facilitating web shell deployment (T1100) or placement of files in autostart locations for persistence (T1547.001).

Confidence: MEDIUM · MITRE ATT&CK Enterprise v18.1

NVD Description

Microsoft UFO open-source framework for intelligent automation across devices and platforms. In 3.0.1-4-ge2626659, Microsoft UFO uses the user-controlled task_name value directly when constructing session log paths. An authenticated client can supply path traversal sequences in task_name and cause UFO to…

more

create log directories and log files outside the intended logs/ directory.

Deeper analysisAI

Automated synthesis unavailable for this CVE.

Details

CWE(s)
CWE-22CWE-73
OWASP Top 10 Web 2025
A01:2025A06:2025

EU & UK References

References