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Vulnerability record · CVE-2026-25539 · published 4 February 2026

CVE-2026-25539: B3log siyuan path traversal vulnerability

B3log · Siyuan

SiYuan is a personal knowledge management system. Prior to version 3.5.5, the /api/file/copyFile endpoint does not validate the dest parameter, allowing authenticated users to write files to arbitrary locations on the filesystem. This can lead to Remote Code Execution (RCE) by writing to sensitive locations such as cron jobs, SSH authorized_keys, or shell configuration files. This issue has been patched in version 3.5.5.

7.2 CVSS 3.1 High EPSS 1.0% · top 37.5% CWE-22 · Path traversal
7.2CVSS 3.1 base score
1.0%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

SiYuan is a personal knowledge management system. Prior to version 3.5.5, the /api/file/copyFile endpoint does not validate the dest parameter, allowing authenticated users to write files to arbitrary locations on the filesystem. This can lead to Remote Code Execution (RCE) by writing to sensitive locations such as cron jobs, SSH authorized_keys, or shell configuration files. This issue has been patched in version 3.5.5.

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/siyuan-note/siyuan/commit/d7f790755edf8c78d2b4176171e5a0cdcd720feb Patch
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-c4jr-5q7w-f6r9 ExploitVendor Advisory
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-c4jr-5q7w-f6r9 ExploitVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2026-32767B3log siyuan sql injection vulnerabilitySiYuan is a personal knowledge management system. Versions 3.6.0 and below contain an authorization bypass vulnerability in the /api/search/fullTextS…EPSS 0.70%9.8CVE-2026-30869B3log siyuan path traversal vulnerabilitySiYuan is a personal knowledge management system. Prior to 3.5.10, a path traversal vulnerability in the /export endpoint allows an attacker to read …EPSS 1.1%9.8CVE-2024-53507B3log siyuan sql injection vulnerabilityA SQL injection vulnerability was discovered in Siyuan 3.1.11 in /getHistoryItems.EPSS 0.57%9.8CVE-2024-53504B3log siyuan sql injection vulnerabilityA SQL injection vulnerability has been identified in Siyuan 3.1.11 via the notebook parameter in /searchHistory.EPSS 0.57%9.8CVE-2024-53505B3log siyuan sql injection vulnerabilityA SQL injection vulnerability has been identified in Siyuan 3.1.11 via the id parameter at /getAssetContent.EPSS 0.51%9.8CVE-2024-53506B3log siyuan sql injection vulnerabilityA SQL injection vulnerability has been identified in Siyuan 3.1.11 via the ids array parameter in /batchGetBlockAttrs.EPSS 0.54%9.6CVE-2026-34449B3log siyuan vulnerabilitySiYuan is a personal knowledge management system. Prior to version 3.6.2, a malicious website can achieve Remote Code Execution (RCE) on any desktop …EPSS 0.80%9.1CVE-2026-32749B3log siyuan path traversal vulnerabilitySiYuan is a personal knowledge management system. In versions 3.6.0 and below, POST /api/import/importSY and POST /api/import/importZipMd write uploa…EPSS 0.57%

Source: NIST National Vulnerability Database (record CVE-2026-25539), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.