CVE-2026-126952
Received Received - Intake

Authentication Bypass via WebAuthn in Zipline

Publication date: 2026-11-13

Last updated on: 2026-11-13

Assigner: VulnCheck

Description
Zipline through 4.4.0 contains an authentication bypass vulnerability in the WebAuthn login endpoint that creates sessions for a supplied registered credential ID without verifying the assertion. Attackers who obtain a target's passkey credential ID can impersonate that account without its authenticator, potentially gaining administrative control over SUPERADMIN accounts.

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Meta Information

Published
2026-11-13
Last Modified
2026-11-13
Generated
2026-11-13
AI Q&A
2026-11-13
EPSS Evaluated
N/A
NVD
CVE-2026-126952
EUVD
EUVD-2026-125113

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
diced zipline From 0 (inc) to 4.4.0 (inc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-347 The product does not verify, or incorrectly verifies, the cryptographic signature for data.

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Executive Summary

Zipline through 4.4.0 has an authentication bypass flaw in its WebAuthn login endpoint. It allows attackers with a target's passkey credential ID to create sessions without verifying the assertion. This lets them impersonate the account without needing the actual authenticator device.

Impact Analysis

If exploited, attackers could gain unauthorized access to accounts, including SUPERADMIN accounts, potentially leading to full system compromise. This could result in data theft, unauthorized modifications, or complete control over the affected system.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, violating confidentiality requirements in GDPR and HIPAA. Organizations using affected versions may face compliance violations, legal penalties, and reputational damage due to potential data breaches.

Mitigation Strategies

Update Zipline to the latest version beyond 4.4.0 to patch the authentication bypass in the WebAuthn login endpoint. Disable WebAuthn login temporarily if an update is not immediately available. Monitor for unauthorized administrative access or unusual account activity.

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