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CVE-2026-55671

ZITADEL: Server-Side Request Forgery (SSRF) and Denylist Bypass in Outgoing HTTP Components

LOW
2.3
CVSS Score
Published: July 10, 2026 at 05:17 PM UTC
Updated: July 14, 2026 at 02:16 AM UTC
1 product affected across 1 vendorZitadel

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Severity
LOW2.3
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Zitadel· Zitadel
60%
v < 4.15.2
Affected range stops below 4.15.2, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (3)

x_refsource_CONFIRM
Source: cverecord
https://github.com/zitadel/zitadel/security/advisories/GHSA-29jh-8cfq-rr8x
x_refsource_MISC
Source: cverecord
https://github.com/zitadel/zitadel/commit/b6f78086913b8d916bce9ab2e049ab0d84f947fd
x_refsource_MISC
Source: cverecord
https://github.com/zitadel/zitadel/releases/tag/v4.15.2

SSVC — Action Prioritization

SSVCNo known exploitAutomatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

2.3LOWGitHub_M
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-918

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