What’s Vulnerable › Vulnerabilities

CVE-2026-87810: Siyuan before v3.8.2 Information Disclosure via fullTextSearchBlock

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-09 · updated 2026-09-14
• Weakness: CWE-200

Description

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publish-mode readers can submit arbitrary search terms to learn whether matching content exists in hidden or unpublished documents and determine the number of matching blocks and pages.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 products

• siyuan-note siyuan: before 3.8.2 — fixed in 3.8.2

How to fix

Upgrade to a fixed version: siyuan-note siyuan 3.8.2. Check the vendor advisory for mitigations.

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
• https://github.com/siyuan-note/siyuan/security/advisories/GHSA-g45v-hxvm-wccj

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