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Vulnerability Details :

CVE-2026-47273

Summary
Assigner-GitHub_M
Assigner Org ID-a0819718-46f1-4df5-94e2-005712e83aaa
Published At-27 May, 2026 | 20:03
Updated At-28 May, 2026 | 13:26
Rejected At-
Credits

pam_usb: XPath injection via PAM-supplied identifiers in pam_usb configuration queries

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.

Vendors
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Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:GitHub_M
Assigner Org ID:a0819718-46f1-4df5-94e2-005712e83aaa
Published At:27 May, 2026 | 20:03
Updated At:28 May, 2026 | 13:26
Rejected At:
▼CVE Numbering Authority (CNA)
pam_usb: XPath injection via PAM-supplied identifiers in pam_usb configuration queries

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.

Affected Products
Vendor
mcdope
Product
pam_usb
Versions
Affected
  • < 0.9.0
Problem Types
TypeCWE IDDescription
CWECWE-91CWE-91: XML Injection (aka Blind XPath Injection)
Type: CWE
CWE ID: CWE-91
Description: CWE-91: XML Injection (aka Blind XPath Injection)
Metrics
VersionBase scoreBase severityVector
3.16.5MEDIUM
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N
Version: 3.1
Base score: 6.5
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://github.com/mcdope/pam_usb/security/advisories/GHSA-vfj3-5h5v-6g93
x_refsource_CONFIRM
https://github.com/mcdope/pam_usb/pull/311
x_refsource_MISC
https://github.com/mcdope/pam_usb/commit/721fed08a3596cb5b4671ad702f8fdc12dcc7420
x_refsource_MISC
Hyperlink: https://github.com/mcdope/pam_usb/security/advisories/GHSA-vfj3-5h5v-6g93
Resource:
x_refsource_CONFIRM
Hyperlink: https://github.com/mcdope/pam_usb/pull/311
Resource:
x_refsource_MISC
Hyperlink: https://github.com/mcdope/pam_usb/commit/721fed08a3596cb5b4671ad702f8fdc12dcc7420
Resource:
x_refsource_MISC
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:security-advisories@github.com
Published At:27 May, 2026 | 20:16
Updated At:28 May, 2026 | 13:57

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.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary3.16.5MEDIUM
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N
Type: Secondary
Version: 3.1
Base score: 6.5
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N
CPE Matches
Weaknesses
CWE IDTypeSource
CWE-91Primarysecurity-advisories@github.com
CWE ID: CWE-91
Type: Primary
Source: security-advisories@github.com
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://github.com/mcdope/pam_usb/commit/721fed08a3596cb5b4671ad702f8fdc12dcc7420security-advisories@github.com
N/A
https://github.com/mcdope/pam_usb/pull/311security-advisories@github.com
N/A
https://github.com/mcdope/pam_usb/security/advisories/GHSA-vfj3-5h5v-6g93security-advisories@github.com
N/A
Hyperlink: https://github.com/mcdope/pam_usb/commit/721fed08a3596cb5b4671ad702f8fdc12dcc7420
Source: security-advisories@github.com
Resource: N/A
Hyperlink: https://github.com/mcdope/pam_usb/pull/311
Source: security-advisories@github.com
Resource: N/A
Hyperlink: https://github.com/mcdope/pam_usb/security/advisories/GHSA-vfj3-5h5v-6g93
Source: security-advisories@github.com
Resource: N/A

Change History

0
Information is not available yet

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