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CVE-2026-57575

Misskey: SSRF bypass in URL Preview

MEDIUM
6.9
CVSS Score
Published: July 10, 2026 at 08:54 PM UTC
Updated: October 25, 2026 at 03:10 PM UTC
1 product affected across 1 vendorMisskey

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Severity
MEDIUM6.9
Exploit prediction
EPSS 0.6%
SSVC
No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Misskey· Misskey Dev
90%
v < 2026.6.0
Affected range stops below 2026.6.0, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (3)

x_refsource_CONFIRM
Source: cverecord
https://github.com/misskey-dev/misskey/security/advisories/GHSA-jvcx-f39m-5xrj
x_refsource_MISC
Source: cverecord
https://github.com/misskey-dev/misskey/commit/1eac4ccf513a067b9f7b7d123057c09a389fccee
x_refsource_MISC
Source: cverecord
https://github.com/misskey-dev/misskey/releases/tag/2026.6.0

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.9MEDIUMGitHub_M
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-918

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