CVE-2026-57575CWE-918

Misskey: SSRF bypass in URL Preview

Medium · published July 10, 2026

CVSS v4.0
6.9
EPSS
1%
Percentile
48.2
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
6.9 · MEDIUM
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N
EPSS
0.00604 · 48.2th percentile
Weakness
CWE-918 · Server-Side Request Forgery (SSRF)
Published
2026-07-10T20:54Z
EPSS history
Timeline
  • 10 JUL 20:54Z
    Misskey: SSRF bypass in URL Preview
    cvelistv5