Is there a public exploit for CVE-2026-63183?

No public exploit for CVE-2026-63183 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-63183?

CVE-2026-63183 scores CVSS 6.9 (v4.0), rated medium.

What does CVE-2026-63183 affect?

CVE-2026-63183 affects OmniAuth omniauth.

6.9 Medium

OmniAuth is a flexible authentication system utilizing Rack middleware.

CVE-2026-63183

OmniAuth is a flexible authentication system utilizing Rack middleware. Prior to 2.2.0, OmniAuth derives provider callback URLs from request-controlled host information when neither a fixed fullhost nor framework-level incoming host validation is configured. A remote unauthenticated client can supply a forged Host header, creating a host header injection risk in applications whose web framework does not verify incoming host headers. Applications using appropriately configured Rails host authorization or a fixed fullhost are not affected by this path. This issue is fixed in version 2.2.0.

Assessment

CVSS: 6.9 (v4.0)
Severity: Medium
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 4 November 2026
Last updated: 4 November 2026
Affected: OmniAuth · omniauth
Assigner: GitHub_M

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

At the source

EUVD (ENISA)

References

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