CVE-2026-87810 Siyuan before v3.8.2 Information Disclosure via fullTextSearchBlock
Unauthenticated users can infer existence and count of hidden content via search API, leaking private data in publish mode.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-87810?
CVE-2026-87810 is a medium-severity vulnerability in siyuan-note siyuan, published on 9 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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publish-mode readers can submit arbitrary search terms to learn whether matching content exists in hidden or unpublished documents and determine the number of matching blocks and pages.
Weakness: CWE-200
Which versions are affected by CVE-2026-87810?
How do I fix CVE-2026-87810?
No fix has been published for CVE-2026-87810 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-87810 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-87810 exists.
Sources
Also known as GHSA-g45v-hxvm-wccj, GHSA-mg7g-xgr5-f9cw.