CVE-2026-72803: SiYuan before v3.7.4 Information Disclosure via getBlockAttrs

Severity: medium (CVSS 5.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-12 · updated 2026-10-24
Weakness: CWE-862

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.

Affected products

siyuan-note siyuan: before 3.7.4 — fixed in 3.7.4

How to fix

Upgrade to a fixed version: siyuan-note siyuan 3.7.4. Check the vendor advisory for mitigations.

References

https://github.com/siyuan-note/siyuan/security/advisories/GHSA-qvq9-hq6p-v378
https://www.vulncheck.com/advisories/siyuan-before-information-disclosure-via-getblockattrs
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-qvq9-hq6p-v378

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