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Vulnerabilities

Vulnerability · CVE-2026-66066

Rapid7 Analysis: KindaRails2Shell (CVE-2026-66066)

Published Aug 3, 2026 · catalog updated Aug 25, 2026 · Rapid7 Analysis: KindaRails2Shell ()

Patch now

CVE-2026-66066 is in the CISA known-exploited catalog. Confirm Rapid7 Analysis: KindaRails2Shell () against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Rapid7 Analysis: KindaRails2Shell ()).
  • No version range is stored. A customer cannot check an installed version against this record.
Severity
Unknown—
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
27.86%
Remediation
Remediation guidance
Affected products
vendor rubyonrails rails

Action Pack is a framework for handling and responding to web requests. In versions prior to 7.2.3.2, 8.0.5.1 and 8.1.3.1, Active Storage does not disable libvips operations marked unsafe for untrusted content, allowing a crafted upload to invoke such an operation. Consuming applications are affected when configured to use libvips and accept image uploads from untrusted users. An unauthenticated attacker may exploit this behavior to read arbitrary files accessible to the Rails process, including environment variables and application secrets. Exposure of credentials such as secret_key_base or e VulnCheck canary evidence. Initial-access exploit intelligence.

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.

  • vendor rubyonrails railsversion unspecified

How to fix CVE-2026-66066

What to do

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

Should you patch?

CVE-2026-66066 is in the CISA known-exploited catalog. Confirm Rapid7 Analysis: KindaRails2Shell () against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Affected version ranges are not on this record. Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

What should an analyst verify?

No weakness class is stored. EPSS 27.86%. The CISA KEV listing is the exploitation evidence. A public exploit reference is linked in Sources. That is not the same as confirmed exploitation. Use the source links for the original advisory.

Code

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

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Aug 3, 2026 · Rapid7 Vulnerability Database

    Detected

    Overview On July 29, 2026, the Ruby on Rails project published a security advisory for CVE-2026-66066 , an arbitrary file read in Active Storage applications that use the Vips image processor with untrusted uploads. The affected Active Storage ranges are , >= 8.0, , and >= 8.1, . Vips is the default Active Storage variant processor for applications that load Rails 7.0 or later defaults. Rails 6 ap

  2. Aug 25, 2026 · CISA KEV

    Known exploited

    Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

  3. Aug 25, 2026 · VulnCheck KEV

    Updated

    Action Pack is a framework for handling and responding to web requests. In versions prior to 7.2.3.2, 8.0.5.1 and 8.1.3.1, Active Storage does not disable libvips operations marked unsafe for untrusted content, allowing a crafted upload to invoke such an operation. Consuming applications are affected when configured to use libvips and accept image uploads from untrusted users. An unauthenticated a

Sources

  • CVE.orgVulnerability recordCVE-2026-66066

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-66066

    30-day exploitation probability 27.9%

    first.org
  • Metasploit ModulesPublic exploit moduleexploit_multi/http/rails_activestorage_vips_rce

    Public module reference (normal). Module source is not copied into this catalog.

    rapid7.com
  • Rapid7 Vulnerability DatabaseResearchCVE-2026-66066

    Overview On July 29, 2026, the Ruby on Rails project published a security advisory for CVE-2026-66066 , an arbitrary file read in Active Storage applications that use the Vips image processor with untrusted uploads. The affected Active Storage ranges are , >= 8.0, , and >= 8.1, . Vips is the default Active Storage variant processor for applications that load Rails 7.0 or later defaults. Rails 6 ap

    rapid7.com
  • VulnCheck KEVConfirmed exploitationCVE-2026-66066

    Action Pack is a framework for handling and responding to web requests. In versions prior to 7.2.3.2, 8.0.5.1 and 8.1.3.1, Active Storage does not disable libvips operations marked unsafe for untrusted content, allowing a crafted upload to invoke such an operation. Consuming appl

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.