CVE-2026-66066 Action Pack: Possible arbitrary file read and remote code execution in Active Storage variant processing

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...

CVE-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 applications are...

GHSA-XR9X-R78C-5HRM Active Storage has possible arbitrary file read and remote code execution in Active Storage variant processing

Impact In its default configuration, a Rails application that displays image variants may allow an unauthenticated attacker to read arbitrary files from the server, including the process environment. That environment typically holds secretkeybase and often credentials for external systems, which...

Active Storage has possible arbitrary file read and remote code execution in Active Storage variant processing

Impact In its default configuration, a Rails application that displays image variants may allow an unauthenticated attacker to read arbitrary files from the server, including the process environment. That environment typically holds secretkeybase and often credentials for external systems, which...

KindaRails2Shell: CVE-2026-66066, Critical Arbitrary File Read and Possible Remote Code Execution in Ruby on Rails

Overview On July 29, 2026, the Ruby on Rails project published a security advisory for CVE-2026-66066, a critical vulnerability affecting Active Storage image processing when used in conjunction with the libvips image processing library. The vulnerability has a CVSSv4 score of 9.5 and is classifi...

Files or Directories Accessible to External Parties

Overview Affected versions of this package are vulnerable to Files or Directories Accessible to External Parties through the Vips analyzer and Vips transformer in vips.rb. An attacker can read files from the server, including process environment variables, by uploading a crafted image and causing...

CVE-2026-66066: Initialization of a Resource with an Insecure Default

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...

The vulnerability affects the libvips image processing library in the Active Storage component of the Ruby on Rails software framework. This allows attackers to execute arbitrary code and gain unauthorized access to protected information.

The vulnerability of the libvips image processing library, a component of the Active Storage framework in the Ruby on Rails software platform, relates to insecure resource initialization. Exploiting this vulnerability could allow an attacker to execute arbitrary code remotely and gain unauthorize...

PT-2026-66655

Impact In its default configuration, a Rails application that displays image variants may allow an unauthenticated attacker to read arbitrary files from the server, including the process environment. That environment typically holds secret key base and often credentials for external systems, whic...

Exploit for CVE-2026-66066

🚨 CVE-2026-66066 — KindaRails2Shell Pre-Authenticatio...

Critical Rails Flaw Could Let Unauthenticated Attackers Read Server Files via Image Uploads

Ruby on Rails has released fixes for a critical Active Storage vulnerability that could let unauthenticated attackers read arbitrary files from application servers through crafted image uploads. Tracked as CVE-2026-66066 CVSS score: 9.5, the flaw can expose the Rails process environment and secre...

Possible arbitrary file read and remote code execution in Active Storage variant processing

Impact In its default configuration, a Rails application that displays image variants may allow an unauthenticated attacker to read arbitrary files from the server, including the process environment. That environment typically holds secretkeybase and often credentials for external systems, which...

PT-2026-65864

Name of the Vulnerable Software and Affected Versions activestorage versions prior to 7.2.3.2 activestorage versions 8.0 through 8.0.5 activestorage versions 8.1 through 8.1.3 Description Active Storage fails to disable libvips operations marked as unsafe for untrusted content. This allows an...

Ruby on Rails Active Storage Vips Arbitrary File Read and Remote Code Execution

This module exploits CVE-2026-66066 in Ruby on Rails Active Storage when the application uses the Vips variant processor and accepts untrusted image uploads. A crafted MATLAB v7.3/HDF5 image uses external storage to read text files accessible to the Rails worker through a PNG representation...

CVE-2026-63765

Chatwoot before 4.16.0 contains an authentication bypass vulnerability in the direct uploads controller that allows unauthenticated attackers to create arbitrary ActiveStorage blobs in any tenant account. Attackers can exploit missing authentication checks to resolve any account and conversation,...

CVE-2026-63765 Chatwoot < 4.16.0 Unauthenticated ActiveStorage Direct Upload Arbitrary Blob Creation

Chatwoot before 4.16.0 contains an authentication bypass vulnerability in the direct uploads controller that allows unauthenticated attackers to create arbitrary ActiveStorage blobs in any tenant account. Attackers can exploit missing authentication checks to resolve any account and conversation,...

CVE-2026-63765

Chatwoot before 4.16.0 contains an authentication bypass vulnerability in the direct uploads controller that allows unauthenticated attackers to create arbitrary ActiveStorage blobs in any tenant account. Attackers can exploit missing authentication checks to resolve any account and conversation,...

GHSA-3MVF-82QP-8QH5 Decidim: Verification documents can be downloaded through reusable links

Description Scanned identity-document images provided by participants and shown in the verification admin workflow are exposed through signed /rails/activestorage/disk/ URLs that can be fetched without any authenticated session. Anyone who obtains one of those URLs can retrieve the document until...

Decidim: Verification documents can be downloaded through reusable links

Description Scanned identity-document images provided by participants and shown in the verification admin workflow are exposed through signed /rails/activestorage/disk/ URLs that can be fetched without any authenticated session. Anyone who obtains one of those URLs can retrieve the document until...

Decidim: Private exports can be downloaded through reusable links

Description The normal downloadyourdata flow requires the requester to be logged in as the export owner, but the resulting Active Storage blob redirect URL can be replayed without authentication by anyone who obtains it. Technical description This private export flow turns an authenticated,...