CVE-2026-48792Hinoki check available

Authentication bypass via ignored evdev permission errors

Published May 27, 2026 · Updated May 27, 2026

Protection mechanism failure in mcdope pam_usb before 0.9.1 allows local users to bypass remote-desktop detection during authentication. pusb_has_virtual_input_device() treats every EACCES failure while opening /dev/input/event* as an absent device, and src/local.c continues authentication on that false negative. Exploitation requires a reduced-privilege PAM execution context; normal root-invoked PAM operation is unaffected, while non-root pamusb-check validation can falsely report protection as active.

CVSS severity4.4
Medium
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Protection mechanism failure in mcdope pam_usb before 0.9.1 allows local users to bypass remote-desktop detection during authentication. pusb_has_virtual_input_device() treats every EACCES failure while opening /dev/input/event* as an absent device, and src/local.c continues authentication on that false negative. Exploitation requires a reduced-privilege PAM execution context; normal root-invoked PAM operation is unaffected, while non-root pamusb-check validation can falsely report protection as active.

The record

CVE
CVE-2026-48792
Published
May 27, 2026
Updated
May 27, 2026
Vendor
mcdope
Product
pam_usb
Classifications
CWE-390, CWE-693
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 27, 2026CVE publishedPublication date reported by the CVE source.
  2. May 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0.9.1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

mcdope · pam_usbversion=< 0.9.1

Published CVSS scores

4.4GitHub, Inc.CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-390Detection of Error Condition Without Action
CWE-693Protection Mechanism Failure

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo