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CVE-2026-54066 is a path traversal vulnerability in SiYuan prior to version 3.7.0. The issue affects the /assets/*path route in publish mode and stems from an incomplete fix for CVE-2026-41894: while the earlier patch sanitized the /export/ route, the same root cause remained reachable through the assets handler. By supplying double-URL-encoded directory traversal sequences, an unauthenticated remote attacker can bypass path sanitization and cause the application to resolve and return arbitrary files located within WorkspaceDir. Exposed data can include configuration files, temporary SQLite databases, and application logs. Sensitive material available through these files may include the AccessAuthCode SHA256 hash, API tokens, and synchronization credentials.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.