CVE-2026-55671 Details
Description
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.
A server-side request forgery (SSRF) vulnerability has been identified in ZITADEL, an open-source identity management platform. This vulnerability affects versions 4.0.0-rc.1 through 4.15.1, as well as the 3.x series from 3.0.0 to 3.4.11. The issue arises in ZITADEL's HTTP notification channels, OIDC BackChannel Logout, and SAML metadata URL fetches, where user-defined URLs are not consistently validated against a protected denylist. This oversight allows potentially malicious server-side requests to loop back, access internal IPs, link-local addresses, or follow redirects, exploiting DNS rebinding, redirect, or protocol downgrade vulnerabilities.
Users are advised to upgrade ZITADEL to version 4.15.2 or later. For those on the 3.x series, while an upgrade to v4.15.2 is recommended, workarounds such as implementing strict network policies, egress firewalls, or reverse proxy rules to block outbound connections to internal networks or cloud metadata endpoints can be considered.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Jul 10, 2026CISA-ADP
Assessed Jul 14, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/zitadel/zitadel/commit/b6f78086913b8d916bce9ab2e049ab0d84f947fd | [email protected] | Source CodeVendor |
| https://github.com/zitadel/zitadel/releases/tag/v4.15.2 | [email protected] | Release NotesVendor |
| https://github.com/zitadel/zitadel/security/advisories/GHSA-29jh-8cfq-rr8x | [email protected] | AdvisoryRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-918 | Server-Side Request Forgery (SSRF) | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| ZITADEL | >= 4.0.0-rc.1, <= 4.15.1 (semver) >= 3.0.0, <= 3.4.11 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 14, 2026 | CVE Modified | CISA-ADP |
| Jul 10, 2026 | New CVE Received | [email protected] |