Medium severity6.5NVD Advisory· Published May 27, 2026· Updated May 28, 2026
CVE-2026-47273
CVE-2026-47273
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.
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Affected products
1Patches
Vulnerability mechanics
References
3News mentions
1- Mcdope Pam Usb: 15 CVEs Disclosed in a Single Day — RCE, Auth Bypass, and Race ConditionsVypr Intelligence · May 27, 2026