ZITADEL Vulnerable to Unauthenticated Full-Read SSRF via V2 Login

### Summary Zitadel is vulnerable to an unauthenticated, full-read SSRF vulnerability. An unauthenticated remote attacker can force Zitadel into making HTTP requests to arbitrary domains, including internal addresses. The server then returns the upstream response to the attacker, enabling data exfiltration from internal services. ### Impact ZITADEL Login UI (V2) was vulnerable to service URL manipulation through the x-zitadel-forward-host header. The service URL resolution logic treated the header as a trusted fallback for all deployments, including self-hosted instances. This allowed unauthenticated attacker to force the server to make outbound requests and read the responses, reaching internal services, exfiltrating data, and bypassing IP-based or network-segmentation controls. ### Affected Versions Systems using the login UI (v2) and running one of the following versions are affected: - **v4.x**: `4.0.0-rc.1` through `4.7.0` ### Patches The vulnerability has been addressed in the latest release. The patch resolves the issue by correctly validating the x-zitadel-forward-host, resp. all forwarded headers against the instance domains and trusted domains. It's no longer used to route traffic to the Zitadel API. Before you upgrade, ensure that: - the `ZITADEL_API_URL` is set and is pointing to your instance, resp. system in multi-instance deployments. - the HTTP `host` (or a `x-forwarded-host`) is passed in your reverse proxy to the login UI. - a `x-zitadel-instance-host` (or `x-zitadel-forward-host`) is set in your reverse for multi-instance deployments. If you're running a single instance solution, you don't need to take any actions. Fixed versions: - 4.x: Upgrade to >=[4.7.1](https://github.com/zitadel/zitadel/releases/tag/v4.7.1) ### Workarounds The recommended solution is to update ZITADEL to a patched version. A ZITADEL fronting proxy can be configured to delete all `x-zitadel-forward-host` header values or set it to the requested host before sending requests to ZITADEL self-hosted environments. ### Questions If you have any questions or comments about this advisory, please email us at [[email protected]](mailto:[email protected]) ### Credits Thanks to Amit Laish – GE Vernova for finding and reporting the vulnerability.

Source published

8 Dec 2025 22:19:04 UTC

Source modified

15 Dec 2025 20:25:57 UTC

Observed here

24 Oct 2026 13:19:41 UTC

Source terms

GitHub Advisory Database · CC-BY-4.0

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: osv · GitHub Advisory Database · CC-BY-4.0. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS_V3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N

Publisher rating · CRITICAL