CVE-2026-47273
MEDIUMpam_usb: XPath injection via PAM-supplied identifiers in pam_usb configuration queries
Title source: cnaDescription
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.
References (3)
Core 3
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/mcdope/pam_usb/security/advisories/GHSA-vfj3-5h5v-6g93
X_Refsource_Misc x_refsource_misc
https://github.com/mcdope/pam_usb/pull/311
X_Refsource_Misc x_refsource_misc
https://github.com/mcdope/pam_usb/commit/721fed08a3596cb5b4671ad702f8fdc12dcc7420
Scores
CVSS v3
6.5
EPSS
0.0027
EPSS Percentile
18.8%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-91
Status
published
Products (1)
mcdope/pam_usb
< 0.9.0
Published
May 27, 2026
Tracked Since
May 28, 2026