CVE-2026-72800 SiYuan before v3.7.4 Information Disclosure via Unfiltered API
Authenticated users can bypass publish restrictions to access hidden document schemas and block IDs in SiYuan.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-72800?
CVE-2026-72800 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 apply publish-access filtering to the getAttributeViewKeysByID endpoint, allowing authenticated readers to retrieve complete database column schemas including descriptions, select vocabularies, and template expressions. Additionally, getBlockDefIDsByRefText and getBlockRelevantIDs endpoints enumerate workspace-wide block IDs without publish scoping, enabling attackers to discover valid block identifiers across publish boundaries and access content from hidden or password-protected documents.
Weakness: CWE-862
Which versions are affected by CVE-2026-72800?
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 | 0.0.0-20260724103335-f36331956ae9 |
github.com/siyuan-note/siyuan/kernel Go | All versions | 0.0.0-20260724103335-f36331956ae9 |
github.com/siyuan-note/siyuan/kernel Go | All versions | 0.0.0-20260724103335-f36331956ae9 |
How do I fix CVE-2026-72800?
Upgrade github.com/siyuan-note/siyuan/kernel to 0.0.0-20260724103335-f36331956ae9 or later.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-72800 being exploited?
There is no known exploitation of CVE-2026-72800 in the wild and no public exploit code.
Sources
Also known as GHSA-5fhr-f75j-8wr9, GO-2026-6395.