bleeping-computer · Crawled Aug 1, 2026
Rails patches critical Active Storage flaw with RCE potential
1 CVEs
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AI Summary
A critical vulnerability, CVE-2026-66066, in the Rails Active Storage component allows unauthenticated attackers to read arbitrary files from a Rails application by uploading a specially crafted image when libvips is used for image processing. If successful, attackers can extract sensitive environment variables such as 'secret_key_base', enabling session forgery, data manipulation, and remote code execution (RCE). The vulnerability affects Active Storage versions prior to 7.2.3.2, 8.0.5.1, and 8.1.3.1, with no workaround available for older libvips versions. Public proof-of-concept exploits have accelerated disclosure and prompted WAF protections from Akamai.
AI-extracted · verify before operational use
Extracted Entities 1 found
MITRE ATT&CK TTPs 21 techniques
T1003 OS Credential Dumping · Credential Access T1021 Remote Services · Lateral Movement T1027 Obfuscated Files or Information · Defense Evasion T1056.001 Keylogging · Collection T1059 Command and Scripting Interpreter · Execution T1059.001 PowerShell · Execution T1059.003 Windows Command Shell · Execution T1071.001 Web Protocols · Command And Control T1078 Valid Accounts · Defense Evasion T1082 System Information Discovery · Discovery T1083 File and Directory Discovery · Discovery T1098 Account Manipulation · Persistence T1105 Ingress Tool Transfer · Command And Control T1114 Email Collection · Collection T1190 Exploit Public-Facing Application · Initial Access T1484 Domain or Tenant Policy Modification · Defense Evasion T1485 Data Destruction · Impact T1555 Credentials from Password Stores · Credential Access T1566 Phishing · Initial Access T1570 Lateral Tool Transfer · Lateral Movement T1588 Obtain Capabilities · Resource Development