What’s Vulnerable › Vulnerabilities

CVE-2025-46559: Misskey Directory Traversal Vulnerability in AiScript via `Mk:api`

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2025-05-05 · updated 2026-06-17
• Weakness: CWE-22

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.

Affected products

• misskey-dev misskey: from 12.31.0 before 2025.4.1 — fixed in 2025.4.1

How to fix

Upgrade to a fixed version: misskey-dev misskey 2025.4.1. Check the vendor advisory for mitigations.

References

• https://github.com/misskey-dev/misskey/commit/583df3ec63e25a1fd34def0dac13405396b8b663
• https://github.com/misskey-dev/misskey/security/advisories/GHSA-gmq6-738q-vjp2

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