Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

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

Quick assessment

Affected
zitadel zitadel
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

ZITADEL是瑞士ZITADEL公司开源的一个身份和访问管理平台。 ZITADEL 4.0.0-rc.1版本至4.15.1版本存在服务端请求伪造漏洞，该漏洞源于HTTP通知通道、OIDC BackChannel Logout和SAML元数据URL获取未能一致验证用户定义的URL，允许服务器端请求通过DNS重新绑定、重定向或协议降级到环回地址、内部IP、链路本地地址或重定向端点。

AI Predicted 7.5 Difficulty: Moderate EPSS 0.41% · P36

Affected Version Matrix 1

VendorProduct Version RangeStatus
zitadel zitadel < 4.15.2 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-55671

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
ZITADEL: Server-Side Request Forgery (SSRF) and Denylist Bypass in Outgoing HTTP Components
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
ZITADEL 服务端请求伪造漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
ZITADEL是瑞士ZITADEL公司开源的一个身份和访问管理平台。 ZITADEL 4.0.0-rc.1版本至4.15.1版本存在服务端请求伪造漏洞，该漏洞源于HTTP通知通道、OIDC BackChannel Logout和SAML元数据URL获取未能一致验证用户定义的URL，允许服务器端请求通过DNS重新绑定、重定向或协议降级到环回地址、内部IP、链路本地地址或重定向端点。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
zitadel zitadel < 4.15.2 -

II. Public POCs for CVE-2026-55671

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-55671

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-55671 (2)

Vendor Pages for CVE-2026-55671 (1)

Same Patch Batch · zitadel · 2026-07-10 · 9 CVEs total

CVE-2026-56668 8.1 HIGH ZITADEL: Unauthorized Token Privilege Escalation in OAuth2 Token Exchange
CVE-2026-55672 7.4 HIGH ZITADEL: Missing client_id binding in OIDC authorization code exchange and refresh token f
CVE-2026-56667 7.3 HIGH ZITADEL: Stored XSS via Default URI Redirect in Login V2
CVE-2026-56666 4.8 MEDIUM ZITADEL: Auto-linking by email: IdP-side email verification is not checked
CVE-2026-55669 4.2 MEDIUM ZITADEL: Missing Token Audience Validation (`aud`) in JWT IdP Provider
CVE-2026-56665 4.2 MEDIUM ZITADEL: Missing Token Expiration (`exp`) Validation in JWT IdP Provider
CVE-2026-56664 4.2 MEDIUM ZITADEL: Missing Token Lifecyle Validation (`exp` and `iat`) in JWT IdP Provider
CVE-2026-55670 ZITADEL: Cross-Tenant User Leakage via Recycled Identifiers

IV. Related Vulnerabilities

Same product: zitadel
Same vendor: zitadel
Same weakness: CWE-918