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TI-2026-40852 Aliases CVE-2026-56668GHSA-vrh8-c9cm-wh8v

ZITADEL: Unauthorized Token Privilege Escalation in OAuth2 Token Exchange

Priority LOW 37CWE-862Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-862.

Summary

ZITADEL is an open source identity management platform. Prior to 4.15.3, ZITADEL's OAuth2 Token Exchange endpoint for urn:ietf:params:oauth:grant-type:token-exchange does not verify that the subject token belongs to the requesting client or that requested scopes remain within the original token's scopes, allowing a low-privilege token to be exchanged for elevated permissions at another application. This issue is fixed in version 4.15.3.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00413 35th percentileScored 2026-11-07
Fix Fixed zitadel (zitadel): 4.15.3github.com/zitadel/zitadel (Go): 4.15.3

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

VendorProductAffected versionsFixed inStatusSource
zitadelzitadelbefore 4.15.34.15.3Patch availableCNA
—github.com/zitadel/zitadel (Go)before 4.15.34.15.3Patch availableGHSA-vrh8-c9cm-wh8v
  • zitadel Vendorzitadel Affected before 4.15.3 Fixed in 4.15.3 Patch available CNA
  • github.com/zitadel/zitadel (Go) Vendor— Affected before 4.15.3 Fixed in 4.15.3 Patch available GHSA-vrh8-c9cm-wh8v

CPE names Threatist (inferred) · 1

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

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

Remediation

  • Fix · CNA zitadel (zitadel) Fixed in 4.15.3
  • Fix · GHSA-vrh8-c9cm-wh8v github.com/zitadel/zitadel (Go) Fixed in 4.15.3 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-56668
  2. 2026-10-03 Alias added: GHSA-vrh8-c9cm-wh8v

References

Advisory 1

Other 4

  • 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