CVE-2026-48064Public exploitNetwork attack vector

Remote authentication via skipped PAM_RHOST check

Published May 27, 2026 · Updated May 27, 2026

Incorrect authorization in mcdope pam_usb before 0.9.1 allows remote attackers to authenticate through XDMCP from a nonlocal session. The pusb_do_auth() function places PAM_RHOST retrieval and rejection inside the deny_remote guard, so setting deny_remote=false skips the hard remote-host check. The flaw does not bypass device authentication; exploitation requires XDMCP exposure, deny_remote=false, a cloned or stolen USB device, and the victim's password.

CVSS severity8.1
High
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect authorization in mcdope pam_usb before 0.9.1 allows remote attackers to authenticate through XDMCP from a nonlocal session. The pusb_do_auth() function places PAM_RHOST retrieval and rejection inside the deny_remote guard, so setting deny_remote=false skips the hard remote-host check. The flaw does not bypass device authentication; exploitation requires XDMCP exposure, deny_remote=false, a cloned or stolen USB device, and the victim's password.

The record

CVE
CVE-2026-48064
Published
May 27, 2026
Updated
May 27, 2026
Vendor
mcdope
Product
pam_usb
Classifications
CWE-863, T1133
Attack vector
network
Privileges
unauthenticated

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

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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 vectornetwork
Required privilegesunauthenticated

What is affected?

mcdope · pam_usbversion=< 0.9.1

Published CVSS scores

8.1GitHubCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

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

Weakness, pattern, technique

CWE-863Incorrect Authorization
T1133External Remote Services

Public exploit references

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

Technologies

Your stack

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Your stack

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