CVE-2026-25539

CRITICAL

9.1

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.

Details CVE

Score CVSS v3.19.1

SeveriteCRITICAL

Vecteur CVSSCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Vecteur d'attaqueNETWORK

ComplexiteLOW

Privileges requisHIGH

Interaction utilisateurNONE

Publie2/4/2026

Derniere modification2/11/2026

Sourcenvd

Observations honeypot0

Produits affectes

b3log:siyuan

Faiblesses (CWE)

CWE-22

References

https://github.com/siyuan-note/siyuan/commit/d7f790755edf8c78d2b4176171e5a0cdcd720feb(security-advisories@github.com)

https://github.com/siyuan-note/siyuan/security/advisories/GHSA-c4jr-5q7w-f6r9(security-advisories@github.com)

https://github.com/siyuan-note/siyuan/security/advisories/GHSA-c4jr-5q7w-f6r9(134c704f-9b21-4f2e-91b3-4a467353bcc0)

Correlations IOC

Aucune correlation enregistree

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