---
cve: "CVE-2026-47273"
severity: "MEDIUM"
cvss: 6.5
epss: "27%"
vendor: "mcdope"
kev: false
exploited: false
published: "2026-05-27 20:16:39"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-13T21:17:33+02:00"
---

# CVE-2026-47273

> 6.5 MEDIUM · 🧪 PoC

## Beschreibung

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.

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Hoch | good |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Gering | warn |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Keine | good |

## Patch verfügbar (OSV)

- 721fed08a3596cb5b4671ad702f8fdc12dcc7420 (Commit)

## Referenzen

- <https://github.com/mcdope/pam_usb/security/advisories/GHSA-vfj3-5h5v-6g93>
- <https://github.com/mcdope/pam_usb/pull/311>
- <https://github.com/mcdope/pam_usb/commit/721fed08a3596cb5b4671ad702f8fdc12dcc7420>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-47273) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_