TI-2026-71186 Aliases CVE-2026-109374 GHSA-7j9c-5h49-hq7h

Privilege escalation in ZITADEL via OIDC token exchange impersonation

LOW 23CWE-863Published 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: None · None · None
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-863.

Summary

ZITADEL versions from 3.0.0 before 4.19.2 contain a privilege escalation flaw in OIDC token exchange that is classified as CWE-863, Incorrect Authorization. The admin.impersonation check can be bypassed, so end-user impersonators can impersonate administrators, including IAM_OWNER. An attacker holding the IAM_END_USER_IMPERSONATOR or ORG_END_USER_IMPERSONATOR role can sign in to relying applications as an administrator, with that administrator's roles and claims. The CVSS 4.0 vector requires high privileges and no user interaction.

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

Description from the CNA

ZITADEL 3.0.0 before 4.19.2 contains a privilege escalation vulnerability in OIDC token exchange that allows end-user impersonators to impersonate administrators including IAM_OWNER by bypassing the admin.impersonation check. Attackers holding IAM_END_USER_IMPERSONATOR or ORG_END_USER_IMPERSONATOR roles can sign in to relying applications as administrators with their roles and claims.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00209 11th 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: Partial

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 or later, which fixes the flaw.

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-2026-71184 Authentication bypass in ZITADEL SAML login enables account takeoverPriority MEDIUM 42
Show all 3 records →

Timeline

2026-10-12 Threatist record created from CVE-2026-109374
2026-10-12 Alias added: GHSA-7j9c-5h49-hq7h
2026-10-13 CISA SSVC decision points changed

References

Advisory 1

GitHub Security Advisory (GHSA-w4gv-rcwj-w6r5)

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