Path traversal in Misskey - #VU150175
Published: September 16, 2026
Vulnerability identifier: #VU150175
CSH Severity: Low
CVSS v4: 8.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-22
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to perform directory traversal attacks.
The vulnerability exists due to input validation error when processing directory traversal sequences in custom emoji ZIP import. A remote administrator can send a specially crafted HTTP request and write arbitrary files on the system, leading to arbitrary code execution.
Affected software
Misskey
Remediation
Install updates from vendor's website.
Misskey - update to 2026.9.0