ZITADEL: Server-Side Request Forgery (SSRF) and Denylist Bypass in Outgoing HTTP Components
Priority LOW 20CWE-918Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- Present
- Impact type
- —
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub.
Summary
ZITADEL is an open source identity management platform. From 4.0.0-rc.1 through 4.15.1, ZITADEL's HTTP notification channels, OIDC BackChannel Logout, and SAML metadata URL fetches do not consistently validate user-defined URLs against protected denylist handling, allowing server-side requests to loopback, internal IP, link-local, or redirected endpoints through DNS rebinding, redirects, or protocol downgrades. This issue is fixed in version 4.15.2.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00414 35th percentileScored 2026-11-07
Fix Fixed zitadel (zitadel): 4.15.2github.com/zitadel/zitadel (Go): 1.80.0-v2.20.0.20260615133614-8e82ec1cb9a2
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- 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 | before 4.15.2 | 4.15.2 | Patch available | CNA |
| — | github.com/zitadel/zitadel (Go) | before 1.80.0-v2.20.0.20260615133614-8e82ec1cb9a2 | 1.80.0-v2.20.0.20260615133614-8e82ec1cb9a2 | Patch available | GHSA-29jh-8cfq-rr8x |
- zitadel Vendorzitadel Affected before 4.15.2 Fixed in 4.15.2 Patch available CNA
- github.com/zitadel/zitadel (Go) Vendor— Affected before 1.80.0-v2.20.0.20260615133614-8e82ec1cb9a2 Fixed in 1.80.0-v2.20.0.20260615133614-8e82ec1cb9a2 Patch available GHSA-29jh-8cfq-rr8x
Remediation
- Fix · CNA zitadel (zitadel) Fixed in 4.15.2
- Fix · GHSA-29jh-8cfq-rr8x github.com/zitadel/zitadel (Go) Fixed in 1.80.0-v2.20.0.20260615133614-8e82ec1cb9a2 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-55671
- 2026-10-03 Alias added: GHSA-29jh-8cfq-rr8x
References
Other 5
- https://github.com/zitadel/zitadel/security/advisories/GHSA-29jh-8cfq-rr8x
- https://github.com/zitadel/zitadel/commit/b6f78086913b8d916bce9ab2e049ab0d84f947fd
- https://github.com/zitadel/zitadel/releases/tag/v4.15.2
- https://github.com/zitadel/zitadel/commit/8e82ec1cb9a2b154ff48d3a0fa96b43d1428061f
- https://github.com/zitadel/zitadel
More zitadel vulnerabilities
- 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
Sources
- CVE-2026-55671 · CVE Program
- CVE-2026-55671 · NVD
- FIRST EPSS
- GHSA-29jh-8cfq-rr8x · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences