CVE-2026-87810CWE-200information-disclosure

CVE-2026-87810

Medium · published September 9, 2026

CVSS v3.1
5.3
EPSS
0%
Percentile
26.6
In the wild
Unconfirmed
What it is

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publish-mode readers can submit arbitrary search terms to learn whether matching content exists in hidden or unpublished documents and determine the number of matching blocks and pages.

The record
Technical detail
CVSS v3.1
5.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CVSS v4.0
6.9 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
EPSS
0.00343 · 26.6th percentile
Weakness
CWE-200 · Exposure of Sensitive Information to an Unauthorized Actor
Published
2026-09-09T16:17Z
References (3)
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-g45v-hxvm-wccj · [email protected]https://www.vulncheck.com/advisories/siyuan-before-3.8.2-information-disclosure-via-fulltextsearchblock · [email protected]https://github.com/siyuan-note/siyuan/security/advisories/GHSA-g45v-hxvm-wccj · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 11 SEP 03:19Z
    EPSS moved — → 0%
    epss
  • 09 SEP 11:20Z
    Siyuan before v3.8.2 Information Disclosure via fullTextSearchBlock
    cvelistv5