Siyuan
CVE-2026-30926
HIGH
GHSA-f9cq-v43p-v523
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N
Primary rating from GitHub Advisory.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N
Lifecycle Timeline
2DescriptionGitHub Advisory
SiYuan is a personal knowledge management system. Prior to 3.5.10, a privilege escalation vulnerability exists in the publish service of SiYuan Note that allows low-privilege publish accounts (RoleReader) to modify notebook content via the /api/block/appendHeadingChildren API endpoint. The endpoint requires only the model.CheckAuth role, which accepts RoleReader sessions, but it does not enforce stricter checks, such as CheckAdminRole or CheckReadonly. This allows remote authenticated publish users with read-only privileges to append new blocks to existing documents, compromising the integrity of stored notes.
AnalysisAI
SiYuan Note prior to version 3.5.10 contains an insufficient authorization flaw in the /api/block/appendHeadingChildren endpoint that allows authenticated users with read-only (RoleReader) privileges to modify notebook content by appending blocks to documents. The vulnerability exists because the endpoint applies only basic authentication checks instead of enforcing stricter administrative or read-only restrictions. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | SiYuan prior to version 3.5.10 with publish service enabled. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 7.1 (HIGH). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A remote attacker (requires authentication) could exploit this vulnerability to compromise the affected system. |
| Remediation | Monitor vendor advisories for a patch. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory all SiYuan deployments and identify instances running versions prior to 3.5.10. …
Sign in for detailed remediation steps and compensating controls.
Threat intelligence, references, and detailed analysis are available after sign-in.
Vendor StatusVendor
SUSE
Severity: HighShare
External POC / Exploit Code
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