pam_usb provides hardware authentication for Linux using ordinary removable media. Prior to 0.9.0, pam_usb builds XPath expressions from user-supplied identifiers (PAM username, service name) and device-supplied identifiers (USB device serial, model, vendor) to query /etc/pamusb.conf. These identifiers were not validated for XPath metacharacters, allowing injection of arbitrary XPath predicates. This vulnerability is fixed in 0.9.0.

No CVSS v4.0

Attack Vector Network

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact Low

Integrity Impact High

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
mcdope pam_usb affected
Version Status Constraints
< 0.9.0 affected —

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Project Subscriptions

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Advisories

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Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/mcdope/pam_usb/commit/721fed08a3596cb5b4671ad702f8fdc12dcc7420 cve-icon cve-icon
https://github.com/mcdope/pam_usb/pull/311 cve-icon cve-icon
https://github.com/mcdope/pam_usb/security/advisories/GHSA-vfj3-5h5v-6g93 cve-icon cve-icon
History

Wed, 27 May 2026 20:15:00 +0000

Type Values Removed Values Added
Description pam_usb provides hardware authentication for Linux using ordinary removable media. Prior to 0.9.0, pam_usb builds XPath expressions from user-supplied identifiers (PAM username, service name) and device-supplied identifiers (USB device serial, model, vendor) to query /etc/pamusb.conf. These identifiers were not validated for XPath metacharacters, allowing injection of arbitrary XPath predicates. This vulnerability is fixed in 0.9.0.
Title pam_usb: XPath injection via PAM-supplied identifiers in pam_usb configuration queries
Weaknesses CWE-91
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-05-27T20:03:39.297Z

Reserved: 2026-05-18T23:03:37.230Z

Link: CVE-2026-47273

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-05-27T20:16:39.880

Modified: 2026-05-27T20:16:39.880

Link: CVE-2026-47273

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-27T22:00:17Z

Weaknesses