cve.bz

CVE-2026-126952 Zipline through 4.4.0 WebAuthn Authentication Bypass via Passkey Login

9.2 criticalEPSS 0.3%

Critical (9.2) in diced zipline. EPSS 0.3% estimated probability of exploitation activity in the next 30 days.

On this page
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.

Severity

CVSS 4.0

9.2 critical
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS 3.1

8.1 high
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
0.3% estimated probability of exploitation activity in the next 30 days; 28th percentile. Scored 2026-11-13. A forecast for this CVE across the internet, not for your own systems.
CISA's assessment (SSVC)
Exploitation: PoC · Automatable: no · Technical impact: total, assessed 2026-11-13. From CISA's Vulnrichment in the CVE List: whether it is exploited, whether exploiting it can be automated, and how much control it gives.
CWE
CWE-347 Improper Verification of Cryptographic Signature
OWASP Top 10
A04:2025 Cryptographic Failures
Published
Modified
Assigned by
VulnCheck (CNA)
NVD analysis
Deferred: the NVD does not plan to analyze it
Record from
the NVD, synced

Ask an AI about this CVE

ChatGPTClaudeGoogle AI Mode

Show the promptExplain CVE-2026-126952 for an engineer deciding whether to act. Use https://cve.bz/api/public/cves/CVE-2026-126952?via=ask-ai-copy and https://cve.bz/cve/CVE-2026-126952?via=ask-ai-copy as the source of truth: what is affected and which versions fix it, whether it is in CISA KEV, public exploits, and its EPSS (an internet-wide 30-day estimate of exploitation activity, not a forecast for my systems). If they give no fixed versions, use the CVE record https://cveawg.mitre.org/api/cve/CVE-2026-126952 or the vendor advisory, not third-party mirrors. Tell me how to check whether I am affected and how to verify a fix. Cite the sources and say where they are uncertain.

Opens a third-party assistant; its answer is its own, not cve.bz's. The prompt holds only this CVE's id and public links.

Badge for a README or a site

CVE-2026-126952

An image that stays current: it is drawn from the data each time it is fetched (a host that proxies images, as GitHub does, may show its copy for a while). Markdown:

[![CVE-2026-126952](https://cve.bz/cve/badge/CVE-2026-126952.svg)](https://cve.bz/cve/CVE-2026-126952)

HTML:

<a href="https://cve.bz/cve/CVE-2026-126952"><img src="https://cve.bz/cve/badge/CVE-2026-126952.svg" alt="CVE-2026-126952"></a>

Affected

Versions

From the CNA's record in the CVE List.

ProductAffected
diced ziplinethrough 4.4.0

Attack patterns (CAPEC)

  • CAPEC-463 Padding Oracle Crypto Attack Severity: High
  • CAPEC-475 Signature Spoofing by Improper Validation Likelihood: Low · Severity: High

The attack patterns MITRE's CAPEC relates to this record's weaknesses, as MITRE names them. Credits.

History

  1. The NVD deferred its analysis

Changes since this site first stored the record. The same for every record: /api/public/changes.

References

Check your stackJSON