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

Published Aug 12, 2026
·
Updated

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 Software

1 affected component
SiYuan<3.7.4

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade SiYuan to a version that resolves this vulnerability.

    Fixed in 3.7.4

Event History

Aug 12, 2026
CVE Published
via MITRE·07:07 PM
Data Sourced
via MITRE·07:07 PM
DescriptionSeverityWeakness
Free Weekly Intel

Don't miss critical vulnerabilities

Join thousands of security professionals who receive our weekly digest of trending CVEs, zero-days, and exploited vulnerabilities.

No spam. Unsubscribe anytime.

Frequently Asked Questions

1

What is the severity of CVE-2026-72803?

The severity of CVE-2026-72803 is classified as medium with a score of 5.8.

2

How do I fix CVE-2026-72803?

To fix CVE-2026-72803, upgrade to SiYuan version 3.7.4 or later where the vulnerability is patched.

3

What type of vulnerability is CVE-2026-72803?

CVE-2026-72803 is an information disclosure vulnerability affecting SiYuan.

4

What can attackers access through CVE-2026-72803?

Attackers can retrieve block attributes such as names, aliases, memos, and custom fields from protected documents.

5

Which versions of SiYuan are affected by CVE-2026-72803?

SiYuan versions before 3.7.4 are affected by CVE-2026-72803.

Company

Resources

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co
By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.
© 2026 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203
CVE-2026-72803 - SiYuan before v3.7.4 Information Disclosure via getBlockAttrs - SecAlerts