CVE-2026-27282: Adobe ColdFusion Auth Bypass Vulnerability

CVE-2026-27282 Overview

CVE-2026-27282 is an Improper Input Validation vulnerability affecting Adobe ColdFusion versions 2023.18, 2025.6 and earlier. This security flaw allows attackers to bypass security measures and gain unauthorized access to affected systems. The vulnerability requires user interaction for successful exploitation, making it a targeted attack vector that combines technical exploitation with social engineering elements.

Critical Impact

Attackers can leverage this vulnerability to bypass security features in Adobe ColdFusion, potentially gaining unauthorized access to protected resources and functionality.

Affected Products

• Adobe ColdFusion 2023 (all versions through Update 18)
• Adobe ColdFusion 2025 (all versions through Update 6)
• All prior updates and base installations of affected versions

Discovery Timeline

• April 14, 2026 - CVE-2026-27282 published to NVD
• April 16, 2026 - Last updated in NVD database

Technical Details for CVE-2026-27282

Vulnerability Analysis

This vulnerability stems from improper input validation (CWE-20) within Adobe ColdFusion's security enforcement mechanisms. When certain user-supplied input is processed by the application, insufficient validation allows attackers to craft malicious requests that circumvent intended security controls. The network-accessible nature of ColdFusion servers means this vulnerability can be exploited remotely, though successful exploitation depends on user interaction—such as clicking a malicious link or visiting a compromised page while authenticated.

The security bypass nature of this flaw means that existing protective measures within ColdFusion can be rendered ineffective, allowing attackers to access resources or perform actions that should otherwise be restricted. This is particularly concerning in enterprise environments where ColdFusion often handles sensitive business logic and data processing.

Root Cause

The root cause is classified as CWE-20 (Improper Input Validation). The application fails to properly validate, filter, or sanitize user-controlled input before using it in security-critical decisions. This insufficient validation creates a gap in the security enforcement chain, allowing specially crafted input to bypass authentication or authorization checks that would normally prevent unauthorized access.

Attack Vector

The attack is conducted over the network and targets ColdFusion servers exposed to user access. An attacker must craft a malicious request or page that, when interacted with by a victim user, exploits the input validation flaw to bypass security controls. The user interaction requirement suggests the attack may leverage the victim's session context or permissions to escalate the impact of the security bypass.

Potential attack scenarios include:

• Crafted URLs or form submissions that bypass access controls when processed by an authenticated user
• Malicious payloads embedded in seemingly legitimate content that circumvent security feature validation
• Chained attacks where the security bypass enables further exploitation of protected functionality

Detection Methods for CVE-2026-27282

Indicators of Compromise

• Unexpected access patterns to restricted ColdFusion resources or administrative functions
• Anomalous HTTP requests with unusual parameter values or encoding targeting ColdFusion endpoints
• Authentication or authorization logs showing successful access to protected resources from unexpected sources
• Application logs indicating security validation failures followed by successful resource access

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block malformed or suspicious requests to ColdFusion applications
• Enable detailed logging of all ColdFusion authentication and authorization events for forensic analysis
• Monitor for unusual access patterns to administrative interfaces or sensitive application functionality
• Deploy endpoint detection solutions to identify exploitation attempts against ColdFusion servers

Monitoring Recommendations

• Configure alerting on ColdFusion security audit logs for failed validation events
• Monitor network traffic for unusual request patterns to ColdFusion application endpoints
• Establish baseline access patterns and alert on deviations that may indicate exploitation attempts
• Review ColdFusion server logs regularly for signs of security bypass attempts

How to Mitigate CVE-2026-27282

Immediate Actions Required

• Apply the latest security update from Adobe for ColdFusion 2023 and 2025 immediately
• Restrict network access to ColdFusion servers to only necessary users and systems
• Implement additional input validation at the network perimeter using WAF rules
• Review access logs for any signs of prior exploitation attempts

Patch Information

Adobe has released security updates addressing this vulnerability as documented in Adobe ColdFusion Security Advisory APSB26-38. Organizations should upgrade ColdFusion 2023 to a version beyond Update 18 and ColdFusion 2025 to a version beyond Update 6. The security bulletin provides specific version information and installation guidance for remediation.

Workarounds

• Implement strict input validation at the application layer for all user-controlled data
• Deploy a Web Application Firewall configured to block suspicious request patterns
• Limit user access to ColdFusion applications to trusted networks where possible
• Enable ColdFusion's built-in security features at their strictest settings until patching is complete

# Restrict ColdFusion admin access to trusted IPs (example for Apache)
<Location "/CFIDE/administrator">
    Require ip 192.168.1.0/24
    Require ip 10.0.0.0/8
</Location>