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Vulnerabilities

Vulnerability · CVE-2026-63183

OmniAuth: Host Header Injection Vulnerability

Published Nov 4, 2026 · catalog updated Nov 5, 2026 · OmniAuth: Host Header Injection

Last checked Nov 5, 2026. A connected source was read within the last 7 days.

Open the advisory

Exploitation likelihood is not on this record for CVE-2026-63183. A missing EPSS score is not a low risk. Compare OmniAuth: Host Header Injection with the linked advisory before you change production.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (OmniAuth: Host Header Injection).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
  • EPSS is missing. A missing score is not a low risk.
Severity
Medium6.9
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
Not in the current FIRST EPSS dataset
Remediation
Advisory link
Affected products
Debian:12 ruby-omniauth · Debian:13 ruby-omniauth · Debian:14 ruby-omniauth · vendor omniauth omniauth

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 full_host 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 full_host are not affected by this path. This issue is fixed in version 2.2.0.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • Debian:12 ruby-omniauth2.1.1-1, 2.1.1-2, 2.1.1-3
  • Debian:13 ruby-omniauth2.1.1-4, 2.1.4-1
  • Debian:14 ruby-omniauth2.1.1-4, 2.1.4-1
  • vendor omniauth omniauthversion unspecified

How to fix CVE-2026-63183

  • No stored fix

    No vendor fix text is stored. Use the linked advisory before you change production.

  • Version check

    Seen in 2.1.1-1 · 6 other packages on the advisory

  • Advisory

    Open the cve_org record and follow its fix.

  • Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

Exploitation likelihood is not on this record for CVE-2026-63183. A missing EPSS score is not a low risk. Compare OmniAuth: Host Header Injection with the linked advisory before you change production.

Which versions are affected?

Compare what you have installed with 2.1.1-1, 2.1.1-2, 2.1.1-3, 2.1.1-4, 2.1.4-1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-346. EPSS is absent from the current FIRST dataset. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Debian security

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Nov 4, 2026 · OpenSSF OSV / OSV Scanner

    Detected

  2. Nov 5, 2026 · OpenSSF OSV / OSV Scanner

    Updated

    The description or metadata changed.

Sources

  • CVE.orgVulnerability recordCVE-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 full_host nor framework-level incoming host validation is configured. A remote unauthentic

    cve.org
  • OpenSSF OSV / OSV ScannerPackage advisoryDEBIAN-CVE-2026-63183
    osv.dev

References

Freshness

Last verified in this catalog Nov 5, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • CVE.orgNov 5, 2026
  • OpenSSF OSV / OSV ScannerNov 5, 2026