CVE-2026-48115: Access Control Flaw

Description

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.

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Weakness Type (CWE)

CWE-285 CWE-285

References

Other References

https://github.com/misskey-dev/misskey/releases/tag/2026.5.4 https://github.com/misskey-dev/misskey/security/advisories/GHSA-j49q-76hx-mv8f

Frequently Asked Questions

What is CVE-2026-48115? +

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.

How do I check if I'm vulnerable to CVE-2026-48115? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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CVE-2026-48115