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Vulnerability record · CVE-2026-77317 · published 26 August 2026

CVE-2026-77317: Incorrect authorization vulnerability

SeaweedFS is a distributed storage system for files and blobs. In versions from 3.88 through 4.39, the SFTP server evaluates configured path permissions with a literal string-prefix comparison, so a user scoped to a path is also granted the same access to any sibling path whose name merely begins with the same characters. A user granted access to /tenants/alice therefore also matches /tenants/alice-archive, /tenants/alice2, and similar siblings, because the check does not require a path-component boundary. An authenticated low-privilege SFTP user with a root home directory and narrow path permissions can thereby cross the configured ACL boundary to read another tenant's files, and to overwrite them if granted write, all through the documented SFTP service with its own valid credentials. This issue is fixed in version 4.40.

8.1 CVSS 3.1 High EPSS 0.36% · top 72.4% CWE-863 · Incorrect authorization Deferred
8.1CVSS 3.1 base score
0.36%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
9 Sep 2026Last modified by NVD

Description

SeaweedFS is a distributed storage system for files and blobs. In versions from 3.88 through 4.39, the SFTP server evaluates configured path permissions with a literal string-prefix comparison, so a user scoped to a path is also granted the same access to any sibling path whose name merely begins with the same characters. A user granted access to /tenants/alice therefore also matches /tenants/alice-archive, /tenants/alice2, and similar siblings, because the check does not require a path-component boundary. An authenticated low-privilege SFTP user with a root home directory and narrow path permissions can thereby cross the configured ACL boundary to read another tenant's files, and to overwrite them if granted write, all through the documented SFTP service with its own valid credentials. This issue is fixed in version 4.40.

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

References

LinkTags
https://github.com/seaweedfs/seaweedfs/commit/29981f8d24a62e9571962c4534fb23c48c00bae2
https://github.com/seaweedfs/seaweedfs/security/advisories/GHSA-fvpg-g364-j8vh
https://github.com/seaweedfs/seaweedfs/security/advisories/GHSA-fvpg-g364-j8vh

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Source: NIST National Vulnerability Database (record CVE-2026-77317), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.