ZITADEL: Server-Side Request Forgery (SSRF) and Denylist Bypass in Outgoing HTTP Components (CVE-2026-55671) | HOL Guard CVE

Low · CVSS 2.3CVE-2026-55671GHSA-29JH-8CFQ-RR8X

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

Answer in brief

CVE-2026-55671 records a Low severity (CVSS 2.3) vulnerability in ZITADEL: Server-Side Request Forgery (SSRF) and Denylist Bypass in Outgoing HTTP Components. The current sources do not mark it as known exploited. The current feed maps zitadel/zitadel (generic), github.com/zitadel/zitadel (go). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jul 10, 2026Updated Jul 14, 2026Source checked Sep 17, 2026First seen by HOL Jun 19, 2026Material review Jul 14, 2026

Upstream Advisory

Key facts

Risk: Low · CVSS 2.3
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 2.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps zitadel/zitadel (generic), github.com/zitadel/zitadel (go). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
zitadel/zitadelgeneric	< 4.15.2	Not reported
github.com/zitadel/zitadelgo	<1.80.0-v2.20.0.20260615133614-8e82ec1cb9a2	1.80.0-v2.20.0.20260615133614-8e82ec1cb9a2

Recommended response

Check inventory. Check lockfiles and deployed manifests for zitadel/zitadel, github.com/zitadel/zitadel.
Review the reported fix. Update github.com/zitadel/zitadel to 1.80.0-v2.20.0.20260615133614-8e82ec1cb9a2 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Jul 10, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Jul 14, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Jun 19, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.