High severity · published Sep 9, 2026
CVE-2026-87807
siyuan before v3.8.2 SQL Injection via fullTextSearchBlock
7.5
CVSS
0.5%
EPSS
No
On KEV
Description
siyuan versions before v3.8.2 contain an authenticated SQL injection vulnerability in the fullTextSearchBlock endpoint's method=1 query parameter. Attackers can inject UNION SELECT statements to read the entire blocks table, bypassing publish-access controls and exposing all document content and sensitive attributes.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 39% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SI
siyuan · siyuan-note
before 3.8.2 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-87807
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-87807
vendor-advisory
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-336w-67gx-gx2h
third-party-advisory
https://www.vulncheck.com/advisories/siyuan-before-3.8.2-sql-injection-via-fulltextsearchblock
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