CVE-2026-72805 SiYuan before v3.7.4 Information Disclosure via Block Endpoints
Attackers can access protected document content and metadata in SiYuan by bypassing publish-access checks on specific block endpoints.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-72805?
CVE-2026-72805 is a medium-severity missing authorization vulnerability in siyuan-note siyuan, published on 12 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
SiYuan versions before v3.7.4 fail to enforce publish-access checks on getBlockBreadcrumb, getRefText, and getBlockTreeInfos endpoints, allowing disclosure of protected document content and metadata. Anonymous readers or publish RoleReader accounts can retrieve document titles, ancestor block content snippets, reference text, and path metadata for publish-forbidden or password-protected documents by supplying block IDs.
Weakness: CWE-862
Which versions are affected by CVE-2026-72805?
3 open source packages ship an affected version, including github.com/siyuan-note/siyuan/kernel.
| Package | Affected | Fixed in |
|---|---|---|
github.com/siyuan-note/siyuan/kernel Go | All versions | 0.0.0-20260723163028-931ba693375e |
github.com/siyuan-note/siyuan/kernel Go | All versions | 0.0.0-20260723163028-931ba693375e |
github.com/siyuan-note/siyuan/kernel Go | All versions | 0.0.0-20260723163028-931ba693375e |
How do I fix CVE-2026-72805?
Upgrade github.com/siyuan-note/siyuan/kernel to 0.0.0-20260723163028-931ba693375e or later.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-72805 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-72805 exists.
Sources
Also known as GHSA-67x2-mq63-v9vm, GO-2026-6387.