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CVE-2026-25539

Published: Feb 4, 2026Updated: Feb 11, 2026 Sources: CVE List NVD GHSACWE-22
NVD MITRE
9.1CVSSCRITICAL
EPSS Score
1.0%
Top 41.2%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

SiYuan has Arbitrary File Write via /api/file/copyFile leading to RCE

CVSS Vector Breakdown

AV:NAC:LPR:HUI:NS:CC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:HPrivileges Required
High
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-22

Affected Products

github.com/siyuan-note/siyuan/kernelGoOSS Libraries
siyuansiyuan-note
siyuanb3log
On-premWeb App
Web & CMS Plugins / cms-core
gopackage-ecosystemOSS Libraries
b3logoss-projectWeb & CMS Pluginsaka b3log

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

Official Patch Available

MITRE ATT&CK

2 techniques
Collection
Discovery
View detailed technique mapping

References

https://github.com/siyuan-note/siyuan/security/advisories/GHSA-c4jr-5q7w-f6r9
github.com
https://nvd.nist.gov/vuln/detail/CVE-2026-25539
nvd.nist.gov
https://github.com/siyuan-note/siyuan/commit/d7f790755edf8c78d2b4176171e5a0cdcd720feb
github.com
and 1 more references View all →

Timeline

Published
Feb 4, 2026
Last Updated
Feb 11, 2026

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