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CVE-2026-101091

SiYuan before v3.8.4 SQL Injection via Block Query Embed

HIGH
7.1
CVSS Score
Published: September 28, 2026 at 10:00 PM UTC
Updated: September 29, 2026 at 07:17 PM UTC
2 products affected across 2 vendorsSiyuanSiyuan

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Severity
HIGH7.1
Exploit prediction
EPSS 0.3%
SSVC
PoC

Description

SiYuan versions before v3.8.4 fail to properly validate SQL statements in block query embed blocks executed against siyuan.db. Attackers can craft malicious .sy documents with non-read-only SQL statements that execute automatically during background indexing, rendering, or export operations without authentication.

Affected

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

Siyuan· B3LOG
95%
v < 3.8.4
Affected range stops below 3.8.4, so it looks safe — our inference, not a vendor statement
Siyuan· Siyuan Notego
60%
v < 3.8.4
Vendor states this is fixed in 3.8.4 (unaffected)

Remediation

No guide yet

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

Patch and advisory references

References (3)

Vendor Advisory
Source: cverecord
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-67p9-hm94-xwf3
Patch
Source: cverecord
https://github.com/siyuan-note/siyuan/commit/e8ace0c89182c7ee1a1298ff2a849bb6a83dfdec
Third Party Advisory
Source: cverecord
https://www.vulncheck.com/advisories/siyuan-before-3.8.4-sql-injection-via-block-query-embed

SSVC — Action Prioritization

SSVCPoCNot automatablePartial impact

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

CVSS

7.1HIGHVulnCheck
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-89

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