TI-2026-71184 Aliases CVE-2026-109372 GHSA-65fv-6pff-4q47

Authentication bypass in ZITADEL SAML login enables account takeover

MEDIUM 42CWE-287Published 2026-10-12 · Updated 2026-10-13

Key facts

Attack vector: Network
Privileges required: High
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Security bypass
Confidentiality · integrity · availability: High · High · None
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-287.

Summary

ZITADEL from 3.0.0 before 4.19.2 has an improper authentication flaw (CWE-287) in its SAML identity-provider intent callback. The callback verifies the assertion signature with the provider named in the request URL but does not check that the user resolved from the login intent belongs to that provider. An attacker with organization administrator permission can register a SAML provider with their own signing key and obtain sessions as users linked to other SAML providers on the instance, including in other organizations.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

ZITADEL 4.x before 4.19.2 and 3.x through 3.4.15 contains an authentication bypass in the SAML identity-provider intent callback, which verifies the assertion signature using the provider named in the request URL but resolves the user from the login intent without checking they match. Attackers with organization-administrator permission can register a SAML provider with their own signing key to obtain authenticated sessions as any user linked to another SAML provider on the instance, including in other organizations.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.0037 31st percentileScored 2026-11-07

Fix Fixed zitadel (zitadel): 4.19.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
zitadel	zitadel	3.0.0 to before 4.19.2	4.19.2	Patch available	CNA

zitadel Vendorzitadel Affected 3.0.0 to before 4.19.2 Fixed in 4.19.2 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:zitadel:zitadel::::::::	—	—	zitadel

cpe:2.3:a:zitadel:zitadel:*:*:*:*:*:*:*:* Versions — — ·zitadel

Remediation

Upgrade ZITADEL to version 4.19.2, the fixed version.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Fix · CNA zitadel (zitadel) Fixed in 4.19.2

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Release · 2026-10-12
zitadel 4.19.2
3 records Highest priority Priority MEDIUM 2 MEDIUM, 1 LOW
Other records, highest priority first
- TI-2026-71185 ZITADEL Login V2 Account Takeover via Unsigned Session CookiePriority MEDIUM 42
- TI-2026-71186 Privilege escalation in ZITADEL via OIDC token exchange impersonationPriority LOW 23
Show all 3 records →

Timeline

2026-10-12 Threatist record created from CVE-2026-109372
2026-10-12 Alias added: GHSA-65fv-6pff-4q47
2026-10-13 CISA SSVC decision points changed

References

Advisory 1

GitHub Security Advisory (GHSA-x4c7-fpcx-w9q6)

TI-2024-26607 ZITADEL Vulnerable to Session Information Leakage CVSS 3.1MEDIUM 6.5
TI-2026-67551 ZITADEL before 4.16.2 Account Pre-Hijacking via Forged External IdP Callback CVSS 4.0CRITICAL 9.3
TI-2026-67543 ZITADEL before 4.17.3 Account Takeover via External IdP Linking CVSS 4.0CRITICAL 9.3
TI-2025-41253 ZITADEL Vulnerable to Unauthenticated Full-Read SSRF via V2 Login CVSS 3.1CRITICAL 9.3
TI-2025-39554 Zitadel Bypass Second Authentication Factor CVSS 4.0HIGH 8.7
TI-2026-82647 ZITADEL Login V2 flaw lets attackers approve device authorizations CVSS 4.0HIGH 8.6

See all 77 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences