Cyber Posture

CVE-2026-47272

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 7.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
EPSS Score 0.0002 3.6th percentile
Risk Priority 14 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-47272 is a high-severity Improper Authentication (CWE-287) vulnerability. Its CVSS base score is 7.1 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Multi-Factor Authentication (T1556.006); ranked at the 3.6th 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 Multi-Factor Authentication (T1556.006).
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.

AC-9 Previous Logon Notification
addresses: CWE-287

Detects unauthorized successful logons resulting from improper authentication implementations.

AT-1 Policy and Procedures
addresses: CWE-287

Documented procedures ensure personnel are trained on authentication mechanisms, tangibly lowering the risk of improper authentication being exploited.

AT-2 Literacy Training and Awareness
addresses: CWE-287

Security awareness training instructs users on secure authentication practices and avoiding credential compromise.

AT-3 Role-based Training
addresses: CWE-287

Training on authentication mechanisms and best practices decreases the occurrence of improper authentication.

AU-10 Non-repudiation
addresses: CWE-287

Non-repudiation requires strong authentication mechanisms to irrefutably attribute performed actions to specific individuals or processes.

AU-14 Session Audit
addresses: CWE-287

Session content review can reveal authentication bypasses or failures in session establishment.

AU-6 Audit Record Review, Analysis, and Reporting
addresses: CWE-287

Review of authentication-related audit records can detect improper authentication mechanisms or bypasses.

CA-2 Control Assessments
addresses: CWE-287

Assessments check authentication mechanisms for correct implementation and effectiveness, reducing successful authentication bypass attempts.

MITRE ATT&CK Enterprise TechniquesAI

T1556.006 Multi-Factor Authentication Defense Impairment
Adversaries may disable or modify multi-factor authentication (MFA) mechanisms to enable persistent access to compromised accounts.
attack.mitre.org →
Why these techniques?

The flaw enables bypassing hardware-based MFA authentication via local file deletion, directly facilitating subversion of the multi-factor authentication process.

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

NVD Description

pam_usb provides hardware authentication for Linux using ordinary removable media. Prior to 0.9.0, the pusb_pad_compare() function in src/pad.c only verified that the user-side pad (~/.pamusb/device.pad) could be read, but did not enforce that the system-side pad (the pad file on…

more

the USB device) was also present and readable. If the user-side pad was deleted or unreadable, the function returned a failure that was treated as non-fatal in certain code paths, allowing authentication to succeed without the USB device being verified. A local user can delete their own ~/.pamusb/device.pad to remove the USB device requirement and authenticate without the physical device. This vulnerability is fixed in 0.9.0.

Deeper analysisAI

Automated synthesis unavailable for this CVE.

Details

CWE(s)
CWE-287CWE-908
OWASP Top 10 Web 2025
A07:2025

EU & UK References

References