Quick answers
- Is CVE-2026-47273 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-47273 being exploited in the wild.
- How severe is CVE-2026-47273?
- Medium severity, with a CVSS score of 6.5, published 27 May 2026.
- Which products and versions are affected?
- Mcdope Pam Usb < 0.9.0.
- Is there a fix for CVE-2026-47273?
- A patch was published on 2026-05-14: Fix merged into master branch via PR #311 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-47273 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-47273?
- Check whether you run Mcdope Pam Usb at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
pam_usb prior to version 0.9.0 is vulnerable to XPath injection (CWE-91) within its configuration parser (src/conf.c). The software constructs XPath queries to /etc/pamusb.conf using unvalidated identifiers including the PAM username, service name, and USB device metadata (serial, model, vendor). An attacker can inject arbitrary XPath predicates by providing strings containing single-quotes or control characters. This can be achieved remotely via network services that use PAM (e.g., SSH) or locally by presenting a USB device with malicious hardware identifiers. Successful exploitation could allow an attacker to manipulate the authentication logic to match incorrect device entries or bypass device-specific security constraints. The vulnerability is fixed in version 0.9.0 by implementing a validator that rejects unsafe characters.
Affected products
- mcdope pam_usb < 0.9.0
Timeline
- 2026-05-14: patched: Fix merged into master branch via PR #311
- 2026-05-20: advisory: GitHub Security Advisory published
- 2026-05-27: disclosed: CVE-2026-47273 published to NVD