CVE-2026-105205 SiYuan before 3.8.5 Information Disclosure via /api/block/getDocInfo and getDocsInfo
Attackers can leak hidden block IDs and reference counts from protected documents via API queries, exposing metadata in SiYuan.
- 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-2026-105205?
CVE-2026-105205 is a medium-severity vulnerability in siyuan-note siyuan, published on 4 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
SiYuan before 3.8.5 contains an information disclosure vulnerability that allows publish-mode readers to learn backlink block IDs and reference counts from password-protected and publish-disabled documents by querying a published document. Attackers can send POST requests to /api/block/getDocInfo or getDocsInfo for a published document ID to obtain refIDs and refCount of hidden referencing blocks, bypassing the publish confidentiality boundary.
Weakness: CWE-200
Which versions are affected by CVE-2026-105205?
How do I fix CVE-2026-105205?
No fix has been published for CVE-2026-105205 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-105205 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-105205 exists.
Sources
Also known as GHSA-9fqr-vwrf-9xx3, GHSA-v758-8w88-pfr2.