What is the CVSS score of CVE-2025-46559?

CVE-2025-46559 has a CVSS 3.1 base score of 5.4 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:H/A:N. EPSS exploitation probability: 0.1%.

Which versions of Misskey are affected by CVE-2025-46559?

Organizations using version 12.31.0 and should be aware of moderate risk from CVE-2025-46559, a path traversal vulnerability rated CVSS 5.4. This could allow unauthorized file access.. A patch is available.

Is there a public PoC exploit available for CVE-2025-46559?

Yes, a public proof-of-concept exploit is available for CVE-2025-46559. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2025-46559?

Within 30 days: Identify affected systems running version 12.31.0 and and apply vendor patches as part of regular patch cycle. Review file handling controls.

Misskey CVE-2025-46559

MEDIUM

Path Traversal (CWE-22)

2025-05-05 security-advisories@github.com

Path Traversal Misskey

5.4

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

5.4 MEDIUM

AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:H/A:N

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

Attack Vector

Network

Attack Complexity

High

Privileges Required

Low

User Interaction

Required

Scope

Unchanged

Confidentiality

Low

Integrity

High

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 28, 2026 - 18:40 vuln.today

Patch released

Mar 28, 2026 - 18:40 nvd

Patch available

PoC Detected

Sep 03, 2025 - 18:29 vuln.today

Public exploit code

CVE Published

May 05, 2025 - 19:15 nvd

MEDIUM 5.4

DescriptionGitHub Advisory

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.

AnalysisAI

Misskey is an open source, federated social media platform. Rated medium severity (CVSS 5.4), this vulnerability is remotely exploitable. Public exploit code available.

Technical ContextAI

This vulnerability is classified as Path Traversal (CWE-22), which allows attackers to access files and directories outside the intended path. 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 include: Misskey. Version information: version 12.31.0.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Validate and canonicalize file paths. Use chroot or sandboxing. Reject input containing path separators or '../' sequences.