ZITADEL: MFA bypass via session reuse in Login V2 (CVE-2026-85056) | HOL Guard CVE

High · CVSS 8.2CVE-2026-85056GHSA-9993-RFWP-RHWF

ZITADEL: MFA bypass via session reuse in Login V2

Answer in brief

CVE-2026-85056 records a High severity (CVSS 8.2) vulnerability in ZITADEL: MFA bypass via session reuse in Login V2. The current sources do not mark it as known exploited. The current feed maps zitadel/zitadel (generic), github.com/zitadel/zitadel (go), github.com/zitadel/zitadel (go). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 24, 2026Updated Sep 24, 2026Source checked Sep 25, 2026First seen by HOL Sep 25, 2026Material review Sep 24, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 8.2
Exploitation: Not marked as known exploited
Affected software: 3 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 8.2. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps zitadel/zitadel (generic), github.com/zitadel/zitadel (go), github.com/zitadel/zitadel (go). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
zitadel/zitadelgeneric	>=4.0.0 <4.16.1	4.16.1
github.com/zitadel/zitadelgo	<1.80.0-v2.20.0.20260717062356-56f4798ed31f	1.80.0-v2.20.0.20260717062356-56f4798ed31f
github.com/zitadel/zitadelgo	>=0 <1.80.0-v2.20.0.20260717062356-56f4798ed31f	1.80.0-v2.20.0.20260717062356-56f4798ed31f

Recommended response

Check inventory. Check lockfiles and deployed manifests for zitadel/zitadel, github.com/zitadel/zitadel, github.com/zitadel/zitadel.
Review the reported fix. Update zitadel/zitadel to 4.16.1; github.com/zitadel/zitadel to 1.80.0-v2.20.0.20260717062356-56f4798ed31f; github.com/zitadel/zitadel to 1.80.0-v2.20.0.20260717062356-56f4798ed31f if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 24, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 24, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 25, 2026

Sources and claim methodology

Upstream source description

ZITADEL is an open source identity management platform. From 4.0.0 until 4.16.1, ZITADEL Login V2 creates a browser session after password verification and can reuse that session for a later authentication request without verifying a user's enrolled TOTP, OTP, or U2F second factor. When the MFA step is abandoned and login starts again, session-validity checks require MFA only when the organization enables Force MFA or Force MFA for local users only, so a voluntarily enrolled factor can be skipped while completing an OIDC or SAML callback for a customer application. Login V1, the ZITADEL Console, Management and Admin APIs, and user self-management are not affected. This issue is fixed in version 4.16.1.

Quoted source text, attributed separately from HOL analysis.