CVE-2026-85056Network attack vectorHinoki check available

MFA bypass via password-verified session reuse

Published Sep 24, 2026 · Updated Sep 24, 2026

Authentication bypass in ZITADEL 4.0.0 through 4.16.0 allows remote attackers with valid credentials to complete OIDC or SAML login without MFA. Login V2 creates a browser session after password verification, then reuses it without checking a voluntarily enrolled TOTP, OTP, or U2F factor. The bypass requires valid credentials, an enrolled factor, and a policy that does not force MFA; it grants access only to customer applications using Login V2.

CVSS severity8.2
High
EPSS probability0.29%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
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Summary

What happened

Authentication bypass in ZITADEL 4.0.0 through 4.16.0 allows remote attackers with valid credentials to complete OIDC or SAML login without MFA. Login V2 creates a browser session after password verification, then reuses it without checking a voluntarily enrolled TOTP, OTP, or U2F factor. The bypass requires valid credentials, an enrolled factor, and a policy that does not force MFA; it grants access only to customer applications using Login V2.

The record

CVE
CVE-2026-85056
Published
Sep 24, 2026
Updated
Sep 24, 2026
Vendor
ZITADEL
Product
ZITADEL
Classifications
T1078
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 4.0.0, < 4.16.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

ZITADEL · ZITADELversion=>= 4.0.0, < 4.16.1

Published CVSS scores

8.2ZITADELCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1078Valid Accounts

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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