CVE-2026-72803 SiYuan before v3.7.4 Information Disclosure via getBlockAttrs
Attackers can retrieve protected document attributes by bypassing publish-access checks in the getBlockAttrs 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-2026-72803?
CVE-2026-72803 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 in the getBlockAttrs and batchGetBlockAttrs endpoints. Attackers can retrieve block attributes including names, aliases, memos, and custom fields from protected documents by sending POST requests with block IDs.
Weakness: CWE-862
Which versions are affected by CVE-2026-72803?
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 | 0.0.0-20260724093256-229fdffd7e4a |
github.com/siyuan-note/siyuan/kernel Go | All versions | 0.0.0-20260724093256-229fdffd7e4a |
github.com/siyuan-note/siyuan/kernel Go | All versions | 0.0.0-20260724093256-229fdffd7e4a |
How do I fix CVE-2026-72803?
Upgrade github.com/siyuan-note/siyuan/kernel to 0.0.0-20260724093256-229fdffd7e4a or later.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-72803 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-72803 exists.
Sources
Also known as GHSA-qvq9-hq6p-v378, GO-2026-6404.