CVE-2026-48115: Misskey: Improper Authorization in the Announcements API
Misskey is an open source, federated social media platform. All Misskey servers running versions 2024.5.0 and later, but prior to 2026.5.4, contain a vulnerability in the Server Announcements API where insufficient permission checks allow attackers to access limited portions of data that they normally couldn't view. This vulnerability occurs whether or not federation is enabled. This issue has been fixed in version 2026.5.4.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Misskeyto a version that resolves this vulnerability.Fixed in 2026.5.4
Event History
Frequently Asked Questions
What is the severity of CVE-2026-48115?
CVE-2026-48115 has a risk rating of 26.
How do I fix CVE-2026-48115?
To fix CVE-2026-48115, upgrade Misskey to version 2026.5.4 or later.
What does CVE-2026-48115 affect?
CVE-2026-48115 affects all Misskey servers running versions 2024.5.0 to 2026.5.3.
What type of vulnerability is CVE-2026-48115?
CVE-2026-48115 is classified as an improper authorization vulnerability.
What can attackers do in CVE-2026-48115?
In CVE-2026-48115, attackers may access limited portions of data due to insufficient permission checks in the Announcements API.