CVE-2025-46559: Misskey Directory Traversal Vulnerability in AiScript via `Mk:api`
Description
Misskey is an open source, federated social media platform. Starting in version 12.31.0 and prior to version 2025.4.1, missing validation in `Mk:api` allows malicious AiScript code to access additional endpoints that it isn't designed to have access to. The missing validation allows malicious AiScript code to prefix a URL with `../` to step out of the `/api` directory, thereby being able to make requests to other endpoints, such as `/files`, `/url`, and `/proxy`. Version 2025.4.1 fixes the issue.
Classification
CVE ID: CVE-2025-46559
CVSS Base Severity: MEDIUM
CVSS Base Score: 5.4
CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:H/A:N
Problem Types
CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')Affected Products
Vendor: misskey-dev
Product: misskey
Exploit Prediction Scoring System (EPSS)
EPSS Score: 0.03% (probability of being exploited)
EPSS Percentile: 5.49% (scored less or equal to compared to others)
EPSS Date: 2025-06-03 (when was this score calculated)
Stakeholder-Specific Vulnerability Categorization (SSVC)
SSVC Exploitation: poc
SSVC Technical Impact: partial
SSVC Automatable: false
References
https://nvd.nist.gov/vuln/detail/CVE-2025-46559https://github.com/misskey-dev/misskey/security/advisories/GHSA-gmq6-738q-vjp2
https://github.com/misskey-dev/misskey/commit/583df3ec63e25a1fd34def0dac13405396b8b663