Server-side Request Forgery (SSRF) Affecting github.com/zitadel/zitadel/internal/net package, versions <4.15.2
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published1 Jul 2026
- disclosed18 Jun 2026
- creditUnknown
Introduced: 18 Jun 2026
CVE-2026-55671 Â (opens in a new tab)How to fix?
Upgrade github.com/zitadel/zitadel/internal/net to version 4.15.2 or higher.
Overview
Affected versions of this package are vulnerable to Server-side Request Forgery (SSRF) in the processing of user-supplied URLs in outgoing HTTP components, including notification channels, OIDC backchannel logout, and SAML metadata fetches. An attacker can access internal network resources or sensitive endpoints by supplying crafted URLs that bypass denylist checks, potentially leveraging DNS rebinding, HTTP redirects, or protocol downgrades. This is only exploitable if the deployment allows outbound connections to internal or cloud metadata endpoints and does not enforce strict network egress controls.
Workaround
This vulnerability can be mitigated by implementing strict network policies, egress firewalls, or reverse proxy rules to block outbound connections to internal networks, loopback interfaces, or cloud metadata endpoints.