CVE-2023-26360: Adobe ColdFusion Auth Bypass Vulnerability

CVE-2023-26360 Overview

Adobe ColdFusion versions 2018 Update 15 (and earlier) and 2021 Update 5 (and earlier) are affected by an Improper Access Control vulnerability that could result in arbitrary code execution in the context of the current user. This vulnerability allows remote attackers to execute arbitrary code on affected installations without requiring any user interaction, making it particularly dangerous for internet-facing ColdFusion deployments.

Critical Impact

This vulnerability is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, indicating active exploitation in the wild. Attackers can achieve unauthenticated remote code execution on vulnerable ColdFusion servers, potentially leading to complete system compromise.

Affected Products

• Adobe ColdFusion 2018 Update 15 and all earlier updates
• Adobe ColdFusion 2021 Update 5 and all earlier updates
• Adobe ColdFusion 2018 base installation (no updates applied)

Discovery Timeline

• March 23, 2023 - CVE CVE-2023-26360 published to NVD
• October 23, 2025 - Last updated in NVD database

Technical Details for CVE-2023-26360

Vulnerability Analysis

This vulnerability stems from an Improper Access Control weakness (CWE-284) in Adobe ColdFusion's request handling mechanisms. The flaw allows unauthenticated remote attackers to bypass security controls and execute arbitrary code within the context of the ColdFusion service user.

The vulnerability is particularly severe because exploitation does not require user interaction or authentication. Remote attackers with network access to a vulnerable ColdFusion server can leverage this flaw to gain initial access to target environments, deploy webshells, exfiltrate sensitive data, or establish persistence for further malicious activities.

Root Cause

The root cause lies in improper access control validation within Adobe ColdFusion's request processing logic. The application fails to properly restrict access to sensitive functionality, allowing attackers to reach code paths that should be protected by authentication or authorization checks. This design flaw enables unauthenticated users to invoke operations intended only for privileged users or internal processes.

Attack Vector

The attack vector is network-based, meaning an attacker can exploit this vulnerability remotely over the network without requiring local access or user interaction. The attack complexity is low, as the vulnerability can be exploited without any special conditions or race conditions. No privileges or authentication are required to launch the attack.

Exploitation typically involves sending specially crafted HTTP requests to a vulnerable ColdFusion server. The improper access control allows these requests to bypass intended security restrictions and trigger code execution. Given that this vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, threat actors have demonstrated successful exploitation techniques in real-world attacks.

The vulnerability mechanism involves improper access control validation in Adobe ColdFusion's request handling. Attackers can send crafted requests to vulnerable endpoints that bypass authentication checks, ultimately achieving remote code execution. For detailed technical analysis and proof-of-concept information, refer to the Packet Storm Exploit Advisory.

Detection Methods for CVE-2023-26360

Indicators of Compromise

• Unusual HTTP requests targeting ColdFusion administrative endpoints or .cfm/.cfc files from external IP addresses
• Unexpected child processes spawned by the ColdFusion service (e.g., cmd.exe, powershell.exe, /bin/sh)
• Creation of webshells or suspicious .cfm files in the ColdFusion webroot directories
• Outbound network connections from the ColdFusion server to unknown or suspicious IP addresses

Detection Strategies

• Monitor web server logs for anomalous requests patterns targeting ColdFusion-specific endpoints
• Implement file integrity monitoring on ColdFusion installation directories to detect unauthorized file modifications
• Deploy network intrusion detection rules to identify exploitation attempts against ColdFusion servers
• Review process execution logs for the ColdFusion service account for unexpected command execution

Monitoring Recommendations

• Enable verbose logging in ColdFusion Administrator and forward logs to a SIEM for centralized analysis
• Implement web application firewall (WAF) rules to filter malicious requests targeting known ColdFusion attack patterns
• Monitor for indicators published in threat intelligence feeds related to CVE-2023-26360 exploitation campaigns
• Conduct regular vulnerability scans to identify unpatched ColdFusion instances in your environment

How to Mitigate CVE-2023-26360

Immediate Actions Required

• Apply the security update from Adobe immediately to all ColdFusion 2018 and 2021 installations
• If patching is not immediately possible, restrict network access to ColdFusion servers using firewall rules
• Review ColdFusion servers for signs of compromise before and after patching
• Enable ColdFusion lockdown settings as documented in Adobe's security hardening guides

Patch Information

Adobe has released security bulletin APSB23-25 addressing this vulnerability. Organizations should upgrade to:

• ColdFusion 2018: Update 16 or later
• ColdFusion 2021: Update 6 or later

This update is considered critical and should be applied with highest priority given the active exploitation in the wild. Organizations can download the patches from the Adobe Security Patch APSB23-25 page.

Workarounds

• Place ColdFusion servers behind a reverse proxy or WAF with rules to block exploitation attempts
• Restrict network access to ColdFusion administrative interfaces to trusted IP addresses only
• Disable external access to ColdFusion servers until patches can be applied
• Implement network segmentation to limit lateral movement if a ColdFusion server is compromised

# Example: Restrict access to ColdFusion admin using iptables
# Allow only trusted management network
iptables -A INPUT -p tcp --dport 8500 -s 10.0.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 8500 -j DROP

# Block external access to ColdFusion Administrator
iptables -A INPUT -p tcp --dport 443 -m string --string "/CFIDE/administrator" --algo bm -j DROP