Misskey
CVE-2025-46559
MEDIUM
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A01:2025 - Broken Access Control
ASVS 5.0
V5 - File Handling Path canonicalization, traversal prevention
MITRE ATT&CK
2 techniques across 2 tactics: Discovery, Collection The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Impact | CVSS score of 5.4 (MEDIUM). Attack characteristics: network attack vector, high complexity, low privileges required, user interaction required. Public proof-of-concept exploit code is available. EPSS exploitation probability: 0.15%. |
| Exploit ScenarioDerived | A remote attacker could access files and directories outside the intended path by sending crafted requests to the affected application. |
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Alert meAnalysisAIv1 – Mar 28, 2026
Misskey is an open source, federated social media platform. Rated medium severity (CVSS 5.4), this vulnerability is remotely exploitable. Public exploit code available.
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.
Affects your stack
Find out whether the stacks and servers you run are on an affected version.
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
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.
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- Exploit and PoC references, threat intelligence from 22 sources
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Severity by source
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
Lifecycle Timeline
3DescriptionGitHub 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.
Executive ViewAI
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. Proof-of-concept code is publicly available. A patch is available and should be applied during regular vulnerability management.
Apply vendor patch. If patching is delayed: restrict file access via WAF, implement allowlists.
Threat Intelligence Overview
NVD
CVE.org
EPSS
GitHub
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Path traversal exploits occur when applications use user-controlled input to construct file system paths without proper validation.
Affected Products (CPE)GitHub Advisory
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Login rate-limit bypass in Misskey (versions 2025.9.1 through 2025.11.x, and up to but not including 2025.12.0-alpha.2)
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Signature validation bypass in Misskey (versions 12.37.0 through prior to 2026.5.4) allows an attacker to have spoofed A
JSON-LD signature validation in Misskey's ActivityPub federation layer accepts fraudulent federated activities due to a
Misskey is an open source, federated social media platform. Rated high severity (CVSS 8.8), this vulnerability is remote
Misskey is an open source, federated social media platform. Rated high severity (CVSS 8.8), this vulnerability is remote
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Client-side DOM cross-site scripting in Misskey's RSS widgets lets an attacker who controls or can inject into a feed th
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