CVE-2026-34453
SiYuan: Broken access control in /api/bookmark/getBookmark allows unauthenticated publish visitors to read password-protected bookmarked content
Description
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.
INFO
Published Date :
March 31, 2026, 10:16 p.m.
Last Modified :
April 3, 2026, 4:53 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 3.1 | HIGH | MITRE-CVE |
Solution
- Update SiYuan to version 3.6.2 or later.
- Verify the publish service no longer exposes protected content.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-34453.
| URL | Resource |
|---|---|
| https://github.com/siyuan-note/siyuan/issues/17246 | Issue Tracking |
| https://github.com/siyuan-note/siyuan/releases/tag/v3.6.2 | Release Notes |
| https://github.com/siyuan-note/siyuan/security/advisories/GHSA-c77m-r996-jr3q | Exploit Vendor Advisory |
| https://github.com/siyuan-note/siyuan/security/advisories/GHSA-c77m-r996-jr3q | Exploit Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-34453 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-34453
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-34453 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-34453 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Apr. 03, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:b3log:siyuan:*:*:*:*:*:*:*:* versions up to (excluding) 3.6.2 Added Reference Type GitHub, Inc.: https://github.com/siyuan-note/siyuan/issues/17246 Types: Issue Tracking Added Reference Type GitHub, Inc.: https://github.com/siyuan-note/siyuan/releases/tag/v3.6.2 Types: Release Notes Added Reference Type CISA-ADP: https://github.com/siyuan-note/siyuan/security/advisories/GHSA-c77m-r996-jr3q Types: Exploit, Vendor Advisory Added Reference Type GitHub, Inc.: https://github.com/siyuan-note/siyuan/security/advisories/GHSA-c77m-r996-jr3q Types: Exploit, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Apr. 01, 2026
Action Type Old Value New Value Added Reference https://github.com/siyuan-note/siyuan/security/advisories/GHSA-c77m-r996-jr3q -
New CVE Received by [email protected]
Mar. 31, 2026
Action Type Old Value New Value Added Description 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. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Added CWE CWE-863 Added Reference https://github.com/siyuan-note/siyuan/issues/17246 Added Reference https://github.com/siyuan-note/siyuan/releases/tag/v3.6.2 Added Reference https://github.com/siyuan-note/siyuan/security/advisories/GHSA-c77m-r996-jr3q