SiYuan: Encrypted-notebook key-derivation material and wrapped notebook keys disclosed to anonymous readers, enabling offline master-password cracking

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

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

EPSS

• CVE-2026-72801: 0.30% estimated exploitation activity in the next 30 days; percentile 23.38 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

CVE: This vulnerability corresponds to CVE-2026-72801. Summary Two CheckAuth-only endpoints disclose the complete offline attack material for the encrypted-notebook master password, plus the wrapped per-notebook key needed to use it. Both are reachable by the publish RoleReader token and by the anonymous account when Publish.Auth.Enable is false. An unauthenticated remote client can retrieve the Argon2id salt and cost parameters, a verifier that confirms a correct password offline, and the encrypted per-notebook data key reducing the security of every encrypted notebook to the master password's resistance to offline GPU cracking. Details (1) POST /api/system/getConf leaks NotebookCrypto. getConf → GetMaskedConf() marshals the full configuration including NotebookCrypto conf.NotebookCrypto (JSON tag notebookCrypto, not -, so it survives the deep copy). For non-administrators HideConfSecret() is applied, which nulls a dozen secret-bearing fields like AI, MCPOAuth, Api, Flashcard,…

Published by the source

3 Sep 2026, 23:02 UTC

Last modified by the source

10 Sep 2026, 15:15 UTC

Source last checked

26 Oct 2026, 15:29 UTC

1. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-8x84-r2ff-h8pq

2. Revision 2 · amended · 24 Oct 2026

   Amended from osv record GO-2026-6392

3. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-8x84-r2ff-h8pq

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# Patch Next advisory brief: CVE-2026-72801

Advisory: SiYuan: Encrypted-notebook key-derivation material and wrapped notebook keys disclosed to anonymous readers, enabling offline master-password cracking
IDs: CVE-2026-72801, GHSA-8x84-r2ff-h8pq
Record: https://patchnext.com/advisories/cve-2026-72801 (revision 3, source checked 26 Oct 2026, 15:29 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: github.com/siyuan-note/siyuan/kernel 0.0.0-20260724102025-3bc014c7dc32. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/siyuan-note/siyuan/kernel: affected < 0.0.0-20260724102025-3bc014c7dc32; fixed in 0.0.0-20260724102025-3bc014c7dc32

## Suggested inspection (read-only)
- Go github.com/siyuan-note/siyuan/kernel: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on github.com/siyuan-note/siyuan/kernel.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-8x84-r2ff-h8pq (OSV record GHSA-8x84-r2ff-h8pq lists affected ranges: Go github.com/siyuan-note/siyuan/kernel >=0 <0.0.0-20260724102025-3bc014c7dc32 (fixed))
- Verified: https://osv.dev/vulnerability/GO-2026-6392 (OSV record GO-2026-6392 lists affected ranges: Go github.com/siyuan-note/siyuan/kernel >=0 <0.0.0-20260724102025-3bc014c7dc32 (fixed))
- Verified: https://github.com/advisories/GHSA-8x84-r2ff-h8pq (GitHub-reviewed advisory GHSA-8x84-r2ff-h8pq lists affected ranges: Go github.com/siyuan-note/siyuan/kernel >=0 <0.0.0-20260724102025-3bc014c7dc32)

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