CVE-2026-68584

SiYuan before v3.7.3 Authentication Bypass via Content Endpoints

Published Aug 3, 2026 CVSS 4.0 · 9.2 Critical EPSS < 1% KEV · Not listed

Description

SiYuan versions before v3.7.3 contain an authentication bypass vulnerability in publish mode where content-returning endpoints getHeadingChildrenDOM, getHeading*Transaction, and getBacklinkDoc perform no password check despite protecting the primary getDoc endpoint. Anonymous attackers can retrieve full content of password-protected documents by obtaining internal block IDs from reader-accessible endpoints and calling unprotected content endpoints to bypass the password gate.

Analysis

Technical impact

SiYuan versions prior to 3.7.3 allow unauthenticated users to read the full contents of password‑protected documents in publish mode because content‑returning endpoints such as getHeadingChildrenDOM, getHeading*Transaction, and getBacklinkDoc do not enforce the password check that protects the main document endpoint, resulting in an authorization bypass (CWE‑288) that compromises confidentiality and may affect data integrity.

Affected Systems

This vulnerability affects the Siyuan Note application distributed by siyuan-note:siyuan; any installation using a release before v3.7.3 that operates in publish mode is vulnerable.

Risk and Exploitability

The CVSS score of 9.2 marks it as Critical. Though the EPSS score is not available, the straightforward attack path—harvesting block identifiers from exposed read‑only endpoints and then requesting protected content from the unprotected endpoints—indicates that exploitation is feasible over the network. The flaw is not listed in the CISA KEV catalog, but its lack of authentication checks demands urgent attention.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

siyuan-note

siyuan

unaffected

Version	Status	Constraints
`0`	affected	< 3.7.3
`3.7.3`	unaffected	—

No data.

Vendor Product Versions

Siyuan

Version	Status	Scheme	Platform
`[0,3.7.3)`	affected	semver	—
`3.7.3`	unaffected	semver	—

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

Upgrade Siyuan to version 3.7.3 or later to apply the vendor patch that adds authentication checks to the content endpoints
If an upgrade is not immediately possible, disable publish mode or block the unprotected content endpoints at the web or application firewall level
Monitor access logs for suspicious requests to the content endpoints and communicate findings to Siyuan support for additional guidance

Generated by OpenCVE AI on August 4, 2026 at 21:08 UTC.

Tracking

Advisories

Source	ID	Title
Github GHSA	GHSA-7j72-f6wg-cxw6	SiYuan: Anonymous publish-password authentication bypass via getHeadingChildrenDOM / getHeading*Transaction / getBacklinkDoc (publish mode)

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact High

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Changed

Confidentiality Impact High

Integrity Impact None

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.535% probability within 30 days)

Exploitation poc

Automatable yes

Technical Impact partial

References

Link	Providers
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-7j72-f6wg-cxw6
https://www.vulncheck.com/advisories/siyuan-before-authentication-bypass-via-content-endpoints

History

Aug 14, 2026 5:15 PM First appearance in the feed. Affected versions updated. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		B3log B3log siyuan
CPEs		cpe:2.3:a:b3log:siyuan::::::::
Vendors & Products		B3log B3log siyuan

Aug 3, 2026 9:30 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Aug 3, 2026 3:15 PM First appearance in the feed. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Siyuan Siyuan siyuan
Vendors & Products		Siyuan Siyuan siyuan

Aug 3, 2026 1:45 PM Description updated. Title updated. Weaknesses updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description		SiYuan versions before v3.7.3 contain an authentication bypass vulnerability in publish mode where content-returning endpoints getHeadingChildrenDOM, getHeading*Transaction, and getBacklinkDoc perform no password check despite protecting the primary getDoc endpoint. Anonymous attackers can retrieve full content of password-protected documents by obtaining internal block IDs from reader-accessible endpoints and calling unprotected content endpoints to bypass the password gate.
Title		SiYuan before v3.7.3 Authentication Bypass via Content Endpoints
Weaknesses		CWE-288
References		https://github.com/siyuan-note/siyuan/security/advisories/GHSA-7j72-f6wg-cxw6 https://www.vulncheck.com/advisories/siyuan-before-authentication-bypass-via-content-endpoints
Metrics		cvssV3_1 `{'score': 8.6, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N'}` cvssV4_0 `{'score': 9.2, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N'}`