CVE-2026-56667 ZITADEL: Stored XSS via Default URI Redirect in Login V2
An administrator can store malicious URIs that execute JavaScript in users' browsers during login errors, enabling session hijacking or account takeover.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-56667?
CVE-2026-56667 is a high-severity cross-site scripting vulnerability in zitadel, published on 10 Jul 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-79
Which versions are affected by CVE-2026-56667?
How do I fix CVE-2026-56667?
No fix has been published for CVE-2026-56667 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-56667 being exploited?
There is no known exploitation of CVE-2026-56667 in the wild and no public exploit code.
Sources
Also known as GHSA-5wcj-9wj4-j65h.