CVE-2026-47273
pam_usb: XPath injection via PAM-supplied identifiers in pam_usb configuration queries
- State
- Published
- Severity
- 6.5 Medium
- Published
- May 27, 2026
- Updated
- May 28, 2026
- Reserved
- May 18, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 6.5 Medium | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N | GitHub_M |
Weaknesses
- CWE-91 XML Injection (aka Blind XPath Injection)
Affected Products
| Product | Versions |
|---|---|
pam_usbmcdope |
|
References
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