SiYuan CVE-2026-73045
HIGHSeverity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-reachable endpoint, no credentials or user interaction required; only confidentiality is impacted - notebook contents disclosed, no integrity or availability effect.
Primary rating from Vendor (vulncheck).
CVSS VectorVendor: vulncheck
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
2DescriptionCVE.org
SiYuan before 3.7.4 contains an improper restriction of excessive authentication attempts vulnerability in the authFilePublishAccess endpoint that allows unauthenticated attackers to brute-force per-notebook publish passwords. Attackers can submit unbounded password guesses without rate limiting or CAPTCHA to gain access to password-protected published notebooks.
AnalysisAI
Unauthenticated brute-force of per-notebook publish passwords is possible in SiYuan before 3.7.4 due to the complete absence of rate limiting or CAPTCHA on the authFilePublishAccess endpoint. Any network-reachable SiYuan instance with the notebook publishing feature enabled and at least one password-protected published notebook is exposed to automated credential guessing, potentially disclosing the notebook's full contents to an unauthorized party. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the SiYuan instance to be bound to a network-accessible address (not localhost-only, which is the default), the notebook publish feature to be enabled with at least one notebook configured with a per-notebook publish password, and the attacker to know or discover the target notebook's publish path. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N) is consistent with the description: network-reachable, zero prerequisites, fully automated exploitation. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker scans the internet for SiYuan instances (identifiable by default UI fingerprints on common ports) and discovers an exposed deployment. Navigating to a published notebook URL, they identify a password prompt and automate HTTP POST requests to the authFilePublishAccess endpoint, cycling through a dictionary or character-space wordlist at high throughput with no server-imposed delay, ultimately recovering the password and reading the notebook contents in full. |
| Remediation | Upgrade to SiYuan 3.7.4 or later, which addresses the missing rate limiting on the authFilePublishAccess endpoint per the vendor advisory at https://github.com/siyuan-note/siyuan/security/advisories/GHSA-v362-968x-gp2v. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, conduct a network discovery to identify all SiYuan instances with the publishing feature enabled and assess which notebooks are password-protected and externally reachable; document the installed versions and flag any running releases prior to 3.7.4. …
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