CVE-2026-87808

Summary

SiYuan versions <= 3.8.1 contain an incomplete fix for CVE-2026-32767 (GHSA-j7wh-x834-p3r7). The prior fix (commit d5e2d0bc) added an administrator check for SQL mode (method=2) in POST /api/search/fullTextSearchBlock, but the endpoint still does not enforce the application's read-only boundary: for method=2 it forwards caller-supplied SQL to the blocks database query path without calling model.CheckReadonly or CheckReadonlyStatementInBox. As a result, when a workspace runs in read-only mode (–readonly=true), an authenticated administrator can submit arbitrary SQL through /api/search/fullTextSearchBlock and obtain raw read access to the blocks database, even though the dedicated /api/query/sql endpoint is blocked in that mode. Fixed in v3.8.2.

Affected Software

Weaknesses

• CWE-693: Protection Mechanism Failure

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: no
  • Technical Impact: partial

Additional References

• https://github.com/siyuan-note/siyuan/security/advisories/GHSA-4qwm-3p58-vh67

References

• https://github.com/siyuan-note/siyuan/security/advisories/GHSA-4qwm-3p58-vh67
• https://github.com/siyuan-note/siyuan/commit/d5e2d0bce0dffef5f61bd8066954bc2d41181fc5
• https://www.vulncheck.com/advisories/siyuan-before-3.8.2-read-only-boundary-bypass-via-fulltextsearchblock

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