PT-2026-57331 · Misskey Dev · Misskey

Published 2026-07-10 · Updated 2026-07-10 · CVE-2026-57575

NVD

CVSS v4.0

6.9

Medium

Base vector

AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Misskey is an open source, federated social media platform. Prior to 2026.6.0, Misskey contains a Server-Side Request Forgery (SSRF) vulnerability in URL preview functionality in UrlPreviewService. Due to missing network restrictions before establishing outbound connections, a remote attacker can cause the Misskey server to initiate HTTP requests to loopback, private, or link-local services. Because IP address validation takes place after the request has been sent and the process is subsequently rejected, no sensitive internal data is believed to be transmitted back or exposed to the attacker. This issue is fixed in version 2026.6.0.

Fix

SSRF

Weakness Enumeration

CWE-918

Related Identifiers

CVE-2026-57575

Affected Products

Misskey

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-57575 · Security Note
• https://github.com/misskey-dev/misskey/releases/tag/2026.6.0 · Note
• https://github.com/misskey-dev/misskey/commit/1eac4ccf513a067b9f7b7d123057c09a389fccee · Note
• https://github.com/misskey-dev/misskey/security/advisories/GHSA-jvcx-f39m-5xrj · Note