CVE-2026-55689 OpenFGA: OIDC audience validation skipped when --authn-oidc-audience is unset
Attackers can authenticate to OpenFGA using tokens from unrelated services if OIDC audience validation is not explicitly configured.
- 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-2026-55689?
CVE-2026-55689 is a medium-severity authentication bypass vulnerability in openfga, published on 9 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
OpenFGA is an authorization/permission engine built for developers. Prior to 1.18.0, OpenFGA's OIDC authenticator skipped JWT audience validation when authn.method was set to oidc, authn.oidc.issuer was configured, and authn.oidc.audience was not set, allowing a token minted for an unrelated service by the same identity provider to authenticate to OpenFGA. This issue is fixed in 1.18.0.
Weakness: CWE-287
Which versions are affected by CVE-2026-55689?
3 open source packages ship an affected version, including github.com/openfga/openfga. It affects 2 products.
| Package | Affected | Fixed in |
|---|---|---|
github.com/openfga/openfga Go | All versions | 1.18.0 |
github.com/openfga/openfga Go | All versions | 1.18.0 |
github.com/openfga/openfga Go | All versions | 1.18.0 |
Products include Openfga Helm Charts, Openfga Openfga.
How do I fix CVE-2026-55689?
Upgrade github.com/openfga/openfga to 1.18.0 or later.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-55689 being exploited?
There is no known exploitation of CVE-2026-55689 in the wild and no public exploit code.
Other vulnerabilities in openfga
Sources
Also known as CLEANSTART-2026-GI00797, CLEANSTART-2026-RC76229, CLEANSTART-2026-RF10343, CLEANSTART-2026-SL02652, ECHO-6ebd-1b12-c874, GHSA-hcxc-wf8j-23hv and 19 more.