Incorrect Authorization Affecting seaweedfs package, versions <4.40-r0
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-MINIMOSLATEST-SEAWEEDFS-19503055
- published3 Sept 2026
- disclosed26 Aug 2026
Introduced: 26 Aug 2026
CVE-2026-77298 (opens in a new tab)How to fix?
Upgrade Minimos:latest seaweedfs to version 4.40-r0 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream seaweedfs package and not the seaweedfs package as distributed by Minimos.
See How to fix? for Minimos:latest relevant fixed versions and status.
SeaweedFS is a distributed storage system for files and blobs. In versions 4.39 and earlier, the S3 API accepts an external OIDC JWT sent directly in the Authorization header and maps it to an IAM role without enforcing that role's trust policy, so a federated user can assume a role they are not permitted to hold. The standard STS AssumeRoleWithWebIdentity path rejects such a token when the role's trust policy does not trust the token's federated provider, but the direct S3 bearer path validates only the token itself and then authenticates as the mapped role and evaluates that role's attached S3 permissions. As a result, a valid OIDC user whose token would be denied the role through STS can obtain the role's S3 access, including object read, write, and delete, by presenting the raw OIDC JWT directly to the S3 API. This issue is fixed in version 4.40
References
- https://www.cve.org/CVERecord?id=CVE-2026-77298
- https://osv.dev/vulnerability/MINI-jwm5-65w2-v6vh
- https://osv.dev/vulnerability/CVE-2026-77298
- https://github.com/seaweedfs/seaweedfs/commit/ac524e140a37242b2488be9dfffae918da1d4de1
- https://github.com/seaweedfs/seaweedfs/security/advisories/GHSA-757h-cm9x-wprg