CVE-2026-55689: openfga Auth Bypass — Fix

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.

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CVSS v3.1 Score

6.8

MEDIUM

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N

EPSS — Exploit Prediction

0.0030

Probability of exploitation

0.22%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-287 Improper Authentication

Affected Products

Vendor	Product	Versions
openfga	helm_charts	< 0.3.9
openfga	openfga	< 1.18.0

References

Advisories & Patches

https://github.com/openfga/openfga/commit/44596773b2e62738720ef215bf7fa04352954271 https://github.com/openfga/openfga/security/advisories/GHSA-hcxc-wf8j-23hv

Other References

https://github.com/openfga/helm-ch https://github.com/openfga/helm-charts/releases/tag/openfga-0.3.9 https://github.com/openfga/openfga/releases/tag/v1.18.0

Frequently Asked Questions

What is CVE-2026-55689? +

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. It has a CVSS v3.1 base score of 6.8 (MEDIUM).

How severe is CVE-2026-55689? +

CVE-2026-55689 has a CVSS v3.1 score of 6.8 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0030, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-55689? +

CVE-2026-55689 affects products from openfga, specifically: helm_charts, openfga. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-55689? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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