CVE-2026-34453

SiYuan: Broken access control in /api/bookmark/getBookmark allows unauthenticated publish visitors to read password-protected bookmarked content

SiYuan is a personal knowledge management system. Prior to version 3.6.2, the publish service exposes bookmarked blocks from password-protected documents to unauthenticated visitors. In publish/read-only mode, /api/bookmark/getBookmark filters bookmark results by calling FilterBlocksByPublishAccess(nil, ...). Because the filter treats a nil context as authorized, it skips the publish password check and returns bookmarked blocks from documents configured as Protected. As a result, anyone who can access the publish service can retrieve content from protected documents without providing the required password, as long as at least one block in the document is bookmarked. This issue has been patched in version 3.6.2.

Affected

siyuan-note · siyuan

CVSS v3.1 GITHUB

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

EPSS

1.45% chance of exploitation in the next 30 days, 73rd percentile

Nuclei

high · CWE-863

Published

2026-03-31

Updated

2026-04-01

Proof-of-concept exploits (1)

• advisories/GHSA-c77m-r996-jr3q

Nuclei templates (1)

• projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-34453.yaml

Security advisories

• siyuan-note/siyuan/security/advisories/GHSA-c77m-r996-jr3q
• siyuan-note/siyuan/issues/17246

References

• CVE Record
• NVD entry