How severe is CVE-2025-25306?

CVE-2025-25306 has a CVSS 3.x base score of 9.3, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity high, and availability none.

Is CVE-2025-25306 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-25306?

CVE-2025-25306 affects Misskey. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-25306?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2025-25306 have an EU (EUVD) identifier?

Yes. CVE-2025-25306 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-7668.

When was CVE-2025-25306 published?

CVE-2025-25306 was published on 2025-03-10 and last updated on 2026-06-17.

CVE-2025-25306

CVE-2025-25306 is a critical-severity vulnerability in Misskey with a CVSS 3.x base score of 9.3. 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-346.

Key facts

Severity: Critical (CVSS 3.x base score 9.3)
EPSS exploit prediction: 0% (6th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-7668
Weakness: CWE-346
Affected product: Misskey
Published: 2025-03-10
Last modified: 2026-06-17

Description

Misskey is an open source, federated social media platform. The patch for CVE-2024-52591 did not sufficiently validate the relation between the `id` and `url` fields of ActivityPub objects. An attacker can forge an object where they claim authority in the `url` field even if the specific ActivityPub object type require authority in the `id` field. Version 2025.2.1 addresses the issue.

Frequently asked questions

What is CVE-2025-25306?: Misskey is an open source, federated social media platform. The patch for CVE-2024-52591 did not sufficiently validate the relation between the `id` and `url` fields of ActivityPub objects. An attacker can forge an object where they claim authority in the `url` field even if the specific ActivityPub object type require authority in the `id` field. Version 2025.2.1 addresses the issue.
How severe is CVE-2025-25306?: CVE-2025-25306 has a CVSS 3.x base score of 9.3, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity high, and availability none.
Is CVE-2025-25306 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-25306?: CVE-2025-25306 affects Misskey. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-25306?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2025-25306 have an EU (EUVD) identifier?: Yes. CVE-2025-25306 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-7668.
When was CVE-2025-25306 published?: CVE-2025-25306 was published on 2025-03-10 and last updated on 2026-06-17.

References

Affected products (1)

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

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