CVE-2025-67494: ZITADEL Vulnerable to Unauthenticated Full-Read SSRF via V2 Login

Should you act?

Critical and remotely reachable

No known exploitation yet, but it is network-reachable without credentials. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.

• No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
• EPSS 0.4%, percentile 37: FIRST’s model estimates a 0.4% chance of exploitation activity in the next 30 days, higher than 37% of all scored CVEs (low). EPSS is a probability, not a verdict.
• Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
• Only applies if your dependency tree includes github.com/zitadel/zitadel (Go) < 1.80.0-v2.20.0.20251208091519-4c879b47334e, fixed in 1.80.0-v2.20.0.20251208091519-4c879b47334e; github.com/zitadel/zitadel (Go) >= 1.83.4, <= 1.87.5, no fixed version listed; github.com/zitadel/zitadel (Go) >= 4.0.0-rc.1, < 4.7.1, fixed in 4.7.1; github.com/zitadel/zitadel/v2 (Go) < 1.80.0-v2.20.0.20251208091519-4c879b47334e, fixed in 1.80.0-v2.20.0.20251208091519-4c879b47334e. Check your lockfile, including transitive dependencies.

What it is

ZITADEL is an open-source identity infrastructure tool. Versions 4.7.0 and below are vulnerable to an unauthenticated, full-read SSRF vulnerability. The ZITADEL Login UI (V2) treats the x-zitadel-forward-host header as a trusted fallback for all deployments, including self-hosted instances. This allows an unauthenticated attacker to force the server to make HTTP requests to arbitrary domains, such as internal addresses, and read the responses, enabling data exfiltration and bypassing network-segmentation controls. This issue is fixed in version 4.7.1.

From the GitHub advisory

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

Weakness type: CWE-918.

Product: github.com/zitadel/zitadel (Go) · Assigned by: GitHub_M · Published: 2025-12-09

Affected and fixed versions

Severity scores

• Attack vector: network (remotely reachable)
• Attack complexity: low
• Privileges required: none (no login)
• User interaction: none
• Scope: changed (can affect other components)

CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.

Exploitation and urgency

• CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
• CISA SSVC assessment: exploitation none, automatable yes, technical impact partial.
• FIRST EPSS (model of 2026-10-21): 0.44% probability of exploitation activity in the next 30 days; percentile 37.

Timeline

• 2025-12-08 — GitHub-reviewed advisory GHSA-7wfc-4796-gmg5 published (critical)
• 2025-12-09 — CVE record published by GitHub_M
• 2025-12-10 — CVE record last updated

Sources and references

Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.

Vulnerability records

1. GitHub Advisory GHSA-7wfc-4796-gmg5 github.com
2. CVE.org record CVE-2025-67494 cve.org
3. NVD entry CVE-2025-67494 nvd.nist.gov

Other references from the CVE record and advisory

1. github.com github.com
2. github.com github.com

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