VULNERABILITY INTELLIGENCE

CVE-2026-47273

CVSS score6.5 MEDIUM
EPSS probability0.27%
CISA KEVNot currently listed
Published2026-05-27
Last modified2026-10-26
CVSS vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N

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.

Weakness classification

  • CWE-91: XML Injection (aka Blind XPath Injection)

Primary references