CVE-2026-87810

Summary

Siyuan before v3.8.2 contains an information disclosure vulnerability in the POST /api/search/fullTextSearchBlock endpoint that filters private blocks from results but returns unfiltered match counts. Unauthenticated publish-mode readers can submit arbitrary search terms to learn whether matching content exists in hidden or unpublished documents and determine the number of matching blocks and pages.

Affected Software

Weaknesses

• CWE-200: Exposure of Sensitive Information to an Unauthorized Actor

References

• https://github.com/siyuan-note/siyuan/security/advisories/GHSA-g45v-hxvm-wccj
• https://www.vulncheck.com/advisories/siyuan-before-3.8.2-information-disclosure-via-fulltextsearchblock

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