CVE-2026-103763

SiYuan before v3.8.5 Information Disclosure via /api/notebook/getNotebookInfo

MEDIUM
5.8
CVSS Score
Published: October 2, 2026 at 11:37 AM UTC
Updated: October 2, 2026 at 04:16 PM UTC
2 products affected across 2 vendorsSiyuanSiyuan

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Severity
MEDIUM5.8
Exploit prediction
EPSS 0.3%
SSVC
PoC

Description

SiYuan before v3.8.5 contains an information disclosure vulnerability that allows read-only publish readers to learn metadata of publish-excluded documents through the getNotebookInfo endpoint. Attackers, including anonymous visitors when no reader password is set, can query publish-visible notebooks to obtain document count, size and modification timestamps of hidden documents.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 3.8.5
Affected range stops below 3.8.5, so it looks safe — our inference, not a vendor statement
v < 3.8.5
Vendor states this is fixed in 3.8.5 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

SSVC — Action Prioritization

SSVCPoCAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.8MEDIUMVulnCheck
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-200

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