Vulnerability · Published Jul 10, 2026 · Assigned by GitHub_M

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

Low 2.3

In plain English

A low-severity server-side request forgery in zitadel from zitadel. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 36% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)2.3Low

Exploit odds (30 days)0.4%top 64.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Go	github.com/zitadel/zitadel	1.80.0-v2.20.0.20260615133614-8e82ec1cb9a2	GHSA-29jh-8cfq-rr8x
Go	github.com/zitadel/zitadel	1.80.0-v2.20.0.20260615133614-8e82ec1cb9a2	GO-2026-5059

Affected products (as reported)

Vendor	Product	Versions
zitadel	zitadel	< 4.15.2

Weakness: CWE-918 · Vector: 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

References

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