CVE-2026-55671Network attack vector

Authenticated SSRF via incomplete outbound URL validation

Published Jul 10, 2026 · Updated Jul 10, 2026

SSRF in ZITADEL 3.0.0 through 3.4.11 and 4.0.0-rc.1 through 4.15.1 allows remote authenticated users to access internal services. HTTP notification, OIDC back-channel logout, and SAML metadata clients accept user-defined targets without consistently applying protected-address checks at connection time or across redirects and HTTPS downgrades. Access to configure an affected URL is required; successful requests can map or interact with internal services, while expected response schemas constrain direct data disclosure.

CVSS severity2.3
Low
EPSS probability0.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in ZITADEL 3.0.0 through 3.4.11 and 4.0.0-rc.1 through 4.15.1 allows remote authenticated users to access internal services. HTTP notification, OIDC back-channel logout, and SAML metadata clients accept user-defined targets without consistently applying protected-address checks at connection time or across redirects and HTTPS downgrades. Access to configure an affected URL is required; successful requests can map or interact with internal services, while expected response schemas constrain direct data disclosure.

The record

CVE
CVE-2026-55671
Published
Jul 10, 2026
Updated
Jul 10, 2026
Vendor
ZITADEL
Product
ZITADEL
Classifications
CWE-918, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 4.15.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

ZITADEL · ZITADELversion=< 4.15.2

Published CVSS scores

2.3GitHubCVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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