CVE-2026-57575Network attack vector

Unauthenticated blind SSRF via post-request IP validation

Published Jul 10, 2026 · Updated Jul 10, 2026

SSRF in Misskey before 2026.6.0 allows remote attackers to make its server contact loopback, private, or link-local services. UrlPreviewService establishes the outbound HTTP connection before applying IP-address restrictions, so validation occurs only after the request reaches its destination. No authentication or user interaction is required; the server sends a blind request, while rejection prevents internal response data from reaching the attacker.

CVSS severity6.9
Medium
EPSS probability0.60%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in Misskey before 2026.6.0 allows remote attackers to make its server contact loopback, private, or link-local services. UrlPreviewService establishes the outbound HTTP connection before applying IP-address restrictions, so validation occurs only after the request reaches its destination. No authentication or user interaction is required; the server sends a blind request, while rejection prevents internal response data from reaching the attacker.

The record

CVE
CVE-2026-57575
Published
Jul 10, 2026
Updated
Jul 10, 2026
Vendor
Misskey Project
Product
Misskey
Classifications
CWE-918, T1090
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2026.6.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Misskey Project · Misskeyversion=< 2026.6.0

Published CVSS scores

6.9GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1090Proxy

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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