CVE-2026-55669 ZITADEL: Missing Token Audience Validation (`aud`) in JWT IdP Provider
Attackers can bypass authentication in ZITADEL by using valid tokens issued for other services due to missing audience validation.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-55669?
CVE-2026-55669 is a medium-severity authentication bypass vulnerability in zitadel, published on 10 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
ZITADEL is an open source identity management platform. Prior to 3.4.12 and 4.15.2, ZITADEL's external JWT Identity Provider validates a token's signature and issuer (iss) but not the audience (aud) claim, allowing a validly signed token from a trusted issuer for another relying party to be accepted by ZITADEL. This issue is fixed in versions 3.4.12 and 4.15.2.
Weakness: CWE-346
Which versions are affected by CVE-2026-55669?
3 open source packages ship an affected version, including github.com/zitadel/zitadel.
| Package | Affected | Fixed in |
|---|---|---|
github.com/zitadel/zitadel Go | All versions | 1.80.0-v2.20.0.20260615132747-d184e976fc79 |
github.com/zitadel/zitadel Go | All versions | 1.80.0-v2.20.0.20260615132747-d184e976fc79 |
github.com/zitadel/zitadel Go | All versions | 1.80.0-v2.20.0.20260615132747-d184e976fc79 |
How do I fix CVE-2026-55669?
Upgrade github.com/zitadel/zitadel to 1.80.0-v2.20.0.20260615132747-d184e976fc79 or later.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-55669 being exploited?
There is no known exploitation of CVE-2026-55669 in the wild and no public exploit code.
Sources
Also known as GHSA-g5h5-m4hm-xjrr, GO-2026-5391.