Auth bypass in Haiwen Seahub
CVE-2026-56768
Seahub before 13.0.23 does not enforce SHARE_LINK_LOGIN_REQUIRED on GET /api/v2.1/share-link-zip-task/, allowing unauthenticated users to bypass authentication. Attackers with a folder share-link token can call the GET endpoint to obtain a fileserver zip token and download entire shared directory trees.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.007 (51.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 51.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000
Affected products
- Haiwen Seahub — versions 0
Weakness classification (CWE)
References
- plus.seafile.com/wiki/publish/seafile-wiki/v5D5/ (release-notes)
- github.com/haiwen/seahub/issues/9050 (issue-tracking)
- github.com/haiwen/seahub/commit/b609949cf64ed6a15708d0fb5ea9c179962e23cc (patch)
- github.com/haiwen/seahub/commit/162cddae0831188d02bb8d451dc2193e197dcc57 (patch)
- www.vulncheck.com/advisories/seahub-authentication-bypass-in-sharelinkziptaskvi… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-56768?
- CVE-2026-56768 is a high-severity vulnerability in Haiwen Seahub, classified under Missing Authorization. CVSS score: 8.8/10. Published 2026-06-25.
- How severe is CVE-2026-56768?
- High severity. CVSS v3 base score is 8.8 out of 10.