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CVE-2026-93921

4.3 · MEDIUM

SiYuan versions through 3.8.4 fail to enforce publish access control in the getDynamicIcon endpoint, allowing read-only token holders to access document metadata.

Published Sep 19, 2026CWE-862EPSS 0.38%

Overview

CVE-2026-93921 is a medium-severity vulnerability. It was published on September 19, 2026 and has a CVSS 3.1 base score of 4.3 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 4.3, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

SiYuan versions through 3.8.4 fail to enforce publish access control in the getDynamicIcon endpoint, allowing read-only token holders to access document metadata. Attackers can call the endpoint with type=8 and crafted content to read block titles, names, aliases, and hierarchical paths of restricted documents via template injection.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/siyuan-note/siyuanGitHubgithub.com/siyuan-note/siyuan/blob/v3.8.4/kernel/api/icon.go#L546-L549GitHubgithub.com/siyuan-note/siyuan/blob/v3.8.4/kernel/api/router.go#L51GitHubgithub.com/siyuan-note/siyuan/blob/v3.8.4/kernel/model/template.go#L485-L526GitHubgithub.com/siyuan-note/siyuan/security/advisories/GHSA-whcx-xxqh-c838Refwww.vulncheck.com/advisories/siyuan-through-3.8.4-access-control-bypass-via-dynamic-icon-endpointGitHubgithub.com/siyuan-note/siyuan/security/advisories/GHSA-whcx-xxqh-c838

How CyberStrike helps

Frequently asked questions

What is CVE-2026-93921?

CVE-2026-93921 is a medium-severity vulnerability. It was published on September 19, 2026 and has a CVSS 3.1 base score of 4.3 (MEDIUM).

How severe is CVE-2026-93921?

This vulnerability has a CVSS 3.1 base score of 4.3, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-93921?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-93921?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-93921 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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