TI-2025-29276 Aliases CVE-2025-46559

Misskey Directory Traversal Vulnerability in AiScript via `Mk:api`

HIGH 66CWE-22Published 2025-05-05 · Updated 2025-05-05

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Information disclosure
Confidentiality · integrity · availability: High · None · None
Fix status: Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-22 and the CVSS impact.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00458 39th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Fixed misskey (misskey-dev): 2025.4.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
misskey-dev	misskey	12.31.0 to before 2025.4.1	2025.4.1	Patch available	CNA

misskey Vendormisskey-dev Affected 12.31.0 to before 2025.4.1 Fixed in 2025.4.1 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:misskey:misskey::::::::	12.31.0 to before 2025.4.1	Vulnerable	misskey-dev

cpe:2.3:a:misskey:misskey:*:*:*:*:*:*:*:* Versions 12.31.0 to before 2025.4.1 Vulnerable ·misskey-dev

Remediation

Fix · CNA misskey (misskey-dev) Fixed in 2025.4.1

Timeline

2026-10-02 Threatist record created from CVE-2025-46559

References

Exploit 1

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

Patch 1

https://github.com/misskey-dev/misskey/commit/583df3ec63e25a1fd34def0dac13405396b8b663

TI-2025-18599 Misskey CSRF vulnerability due to insecure configuration of authentication cookie attributes CVSS 3.1HIGH 8.2
TI-2025-29081 Misskey CSS Style Injection Vulnerability In `MkUrlPreview` CVSS 3.1HIGH 7.2
TI-2025-40906 Misskey has a login rate limit bypass via spoofed X-Forwarded-For header CVSS 4.0MEDIUM 6.9
TI-2025-40839 misskey.js's export data contains private post data CVSS 4.0HIGH 7.1
TI-2026-22705 Misskey lacks proper authorization checks and input validation CVSS 4.0CRITICAL 9.2
TI-2025-18960 Misskey's Incomplete Patch of CVE-2024-52591 Leads to Forgery of Federated Notes CVSS 3.1CRITICAL 9.3

See all 26 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences