SiYuan Publish Mode Endpoints Expose Forbidden Content

SiYuan before v3.7.4 contains an incorrect authorization vulnerability in eight publish-mode reader-facing endpoints that filter results using the visibility list instead of the disabled list. Anonymous visitors can discover and read content from documents explicitly marked as forbidden from publishing by accessing search, backlink, asset content, saved criteria, recent documents, graph, and tag endpoints.

Casky was already ahead

This CVE exploits attack patterns that Casky's 283matched skills already investigate — long before this vulnerability was disclosed. Claude's reasoning model maps these techniques to MITRE ATT&CK, so practitioners who ran these skills have already seen the threat behaviour in their findings.

Analysis

SiYuan before v3.7.4 suffers from an incorrect authorization vulnerability affecting eight reader-facing endpoints in publish mode. The flaw stems from filtering results using visibility lists instead of disabled lists, allowing unauthenticated attackers to discover and read content explicitly marked as forbidden from publishing. This impacts organizations and individuals using SiYuan for knowledge management, documentation, or research who rely on publish mode to selectively share content while protecting sensitive information. The vulnerability exposes multiple attack surfaces including search, backlinks, asset content, saved criteria, recent documents, graph, and tag endpoints—meaning attackers can enumerate and access restricted documents through multiple pathways with minimal effort.

Casky's 283 matching skills leverage Claude AI with extended reasoning to correlate this vulnerability against MITRE ATT&CK Techniques TA0004 (Privilege Escalation) and TA0006 (Credential Access). Practitioners using Casky would identify authorization bypass patterns through skill-driven analysis of endpoint authentication logic, detection of improper access control decisions, and reconnaissance of information disclosure vectors. The platform's skills would surface findings showing how attackers enumerate forbidden documents via search and graph traversal (reconnaissance behavior), then correlate these patterns with CWE-863 (Incorrect Authorization) to reveal the root cause: visibility-based filtering that fails to respect disabled-list constraints. This allows security teams to understand not just that the vulnerability exists, but the specific authorization decision points and data flows that enable the exposure.

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Casky Risk Score

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EPSS Probability

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Shodan Exposure

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GreyNoise Signal

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283 Casky skills cover this attack pattern

These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2026-74906.

abusing-dpapi-for-credential-access

red teaming · high

Run

abusing-shadow-credentials-for-privesc

red teaming · high

Run

Access with Stolen Session Cookie

cryptography · low

Run

MITRE ATT&CK Techniques

TA0004 TA0006

Investigate the attack patterns behind CVE-2026-74906

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