CVE-2026-25992
Undergoing Analysis Undergoing Analysis - In Progress
Case-Insensitive Path Bypass in SiYuan Allows Sensitive File Access

Publication date: 2026-02-10

Last updated on: 2026-02-23

Assigner: GitHub, Inc.

Description
SiYuan is a personal knowledge management system. Prior to 3.5.5, the /api/file/getFile endpoint uses case-sensitive string equality checks to block access to sensitive files. On case-insensitive file systems such as Windows, attackers can bypass restrictions using mixed-case paths and read protected configuration files. This vulnerability is fixed in 3.5.5.
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Meta Information
Published
2026-02-10
Last Modified
2026-02-23
Generated
2026-06-16
AI Q&A
2026-02-10
EPSS Evaluated
2026-06-14
NVD
CVE-2026-25992
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
b3log siyuan to 3.5.5 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-22 The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.
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Executive Summary

The vulnerability exists in SiYuan, a personal knowledge management system, in versions prior to 3.5.5. The /api/file/getFile endpoint uses case-sensitive string equality checks to block access to sensitive files. However, on case-insensitive file systems like Windows, attackers can bypass these restrictions by using mixed-case paths, allowing them to read protected configuration files.

Impact Analysis

This vulnerability allows an attacker to bypass access controls and read sensitive configuration files that should be protected. This can lead to exposure of confidential information, potentially compromising the security of the system or the data it manages.

Compliance Impact

I don't know

Detection Guidance

I don't know

Mitigation Strategies

To mitigate this vulnerability, upgrade SiYuan to version 3.5.5 or later, where the issue with case-sensitive string equality checks on the /api/file/getFile endpoint has been fixed.

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