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NVD Vulnerability Details :
CVE-2026-25539
Analyzed
More InfoOfficial Page
Source-security-advisories@github.com
View Known Exploited Vulnerability (KEV) details
Published At-04 Feb, 2026 | 22:16
Updated At-11 Feb, 2026 | 19:10

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.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary3.19.1CRITICAL
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Primary3.17.2HIGH
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Type: Secondary
Version: 3.1
Base score: 9.1
Base severity: CRITICAL
Vector:
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Type: Primary
Version: 3.1
Base score: 7.2
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
CPE Matches
b3log
b3log
>>siyuan>>Versions up to 3.5.3(inclusive)
cpe:2.3:a:b3log:siyuan:*:*:*:*:*:*:*:*
Weaknesses
CWE IDTypeSource
CWE-22Secondarysecurity-advisories@github.com
CWE ID: CWE-22
Type: Secondary
Source: security-advisories@github.com
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://github.com/siyuan-note/siyuan/commit/d7f790755edf8c78d2b4176171e5a0cdcd720febsecurity-advisories@github.com
Patch
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-c4jr-5q7w-f6r9security-advisories@github.com
Exploit
Vendor Advisory
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-c4jr-5q7w-f6r9134c704f-9b21-4f2e-91b3-4a467353bcc0
Exploit
Vendor Advisory
Hyperlink: https://github.com/siyuan-note/siyuan/commit/d7f790755edf8c78d2b4176171e5a0cdcd720feb
Source: security-advisories@github.com
Resource:
Patch
Hyperlink: https://github.com/siyuan-note/siyuan/security/advisories/GHSA-c4jr-5q7w-f6r9
Source: security-advisories@github.com
Resource:
Exploit
Vendor Advisory
Hyperlink: https://github.com/siyuan-note/siyuan/security/advisories/GHSA-c4jr-5q7w-f6r9
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
Resource:
Exploit
Vendor Advisory
Change History
0Changes found
Details not found