ZITADEL: Auto-linking by email: IdP-side email verification is not checked — GHSA-992Q-9GWP-7R79

Summary

### Summary A flaw in the external identity provider handler allows unauthorized account linking to occur under specific administrative configurations. When auto-linking by email is enabled, ZITADEL checks that the local user's email is verified, but does not explicitly cross-check whether the incoming external identity provider (IdP) also verified that email address upstream. ### Impact When a user logs in via an…

Timeline

Published by source

2026-09-11

Risk context

• Reported severity or threat level: medium.
• Reported CVSS score: 4.8 out of 10.
• Reported EPSS value: 0.00285.
• Review exposure for the affected product or family: go: github.com/zitadel/zitadel.

Product

go: github.com/zitadel/zitadel

What to do

General, cautious steps (verify details in the official source):

• Review exposure and plan remediation based on risk and environment.
• Identify affected product versions in your inventory and verify whether you are impacted.
• Apply vendor patches/updates or recommended mitigations as soon as available.
• Read the official advisory for exact affected versions and remediation steps.

Official advisory

• Read the official source
• CVE Record
• NVD

Evidence and provenance

Canonical advisory ID

GHSA-992Q-9GWP-7R79

Source

GitHub

Vendor

GitHub

Published by source

2026-09-11

Last source activity

2026-09-11

Additional identifiers

CVE-2026-56666

Curated by

hlukh.ch

Related advisories and connections

These advisories are connected by shared CVE, product, vendor, source, or time signals.