How severe is CVE-2025-46559?

CVE-2025-46559 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with high attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity high, and availability none.

Is CVE-2025-46559 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (29th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-46559?

CVE-2025-46559 affects Misskey. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-46559?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-46559 have an EU (EUVD) identifier?

Yes. CVE-2025-46559 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-13506.

When was CVE-2025-46559 published?

CVE-2025-46559 was published on 2025-05-05 and last updated on 2026-06-17.

CVE-2025-46559

CVE-2025-46559 is a medium-severity vulnerability in Misskey with a CVSS 3.x base score of 5.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-22.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
EPSS exploit prediction: 0% (29th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-13506
Weakness: CWE-22
Affected product: Misskey
Published: 2025-05-05
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2025-46559?: 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.
How severe is CVE-2025-46559?: CVE-2025-46559 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with high attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity high, and availability none.
Is CVE-2025-46559 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (29th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-46559?: CVE-2025-46559 affects Misskey. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-46559?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-46559 have an EU (EUVD) identifier?: Yes. CVE-2025-46559 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-13506.
When was CVE-2025-46559 published?: CVE-2025-46559 was published on 2025-05-05 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:misskey:misskey:*:*:*:*:*:*:*:*

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