siyuan-note SiYuan up to 3.8.1 Path Guard path_guard.go IsForbiddenAbsPath privileges management

Summaryinfo

A vulnerability marked as problematic has been reported in siyuan-note SiYuan up to 3.8.1. This affects the function IsForbiddenAbsPath of the file kernel/util/path_guard.go of the component Path Guard. This manipulation causes privileges management. This vulnerability is registered as CVE-2026-85175. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability classified as problematic was found in siyuan-note SiYuan up to 3.8.1. Affected by this vulnerability is the function IsForbiddenAbsPath of the file kernel/util/path_guard.go of the component Path Guard. The manipulation with an unknown input leads to a privileges management vulnerability. The CWE definition for the vulnerability is CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

SiYuan versions <= 3.8.1 (fixed in v3.8.2) contain an incomplete blocklist in the IsForbiddenAbsPath() function (kernel/util/path_guard.go), which only blocks conf/conf.json by exact match and does not restrict the TLS private key (conf/key.pem) or CA private key (conf/ca.key) stored in the same conf/ directory. Because the getFile handler skips the blocklist for RoleAdministrator and all authenticated users receive RoleAdministrator in v3.8.1, any user (or any client on a default no-auth-code instance) can retrieve these private keys via POST /api/file/getFile. On deployments with TLS enabled, this allows decryption of captured HTTPS traffic (key.pem) and forging of certificates trusted by clients that imported SiYuan's CA (ca.key).

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-85175 since 09/03/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation requires an enhanced level of successful authentication. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1068 according to MITRE ATT&CK.

Upgrading to version 3.8.2 eliminates this vulnerability.

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Productinfo

Vendor

• siyuan-note

Name

• SiYuan

Version

• 3.8.0
• 3.8.1

Website

• Product: https://github.com/siyuan-note/siyuan/

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CPE 2.2info

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