CVE-2026-47930: ColdFusion Auth Bypass Vulnerability

CVE-2026-47930 Overview

CVE-2026-47930 is an Improper Input Validation vulnerability [CWE-20] affecting Adobe ColdFusion versions 2023.19, 2025.8, and earlier. The flaw allows a low-privileged, authenticated attacker to bypass security controls over the network without user interaction. Successful exploitation grants unauthorized read and write access to protected resources. Adobe published the issue in security advisory APSB26-64.

Critical Impact
A network-based attacker with low privileges can bypass ColdFusion security features to read and modify protected data without any user interaction.

Affected Products

Adobe ColdFusion 2023 (versions up to and including 2023.19)
Adobe ColdFusion 2025 (versions up to and including 2025.8)
Earlier ColdFusion releases inheriting the same input validation logic

Discovery Timeline

2026-06-09 - CVE-2026-47930 published to NVD
2026-06-10 - Last updated in NVD database

Technical Details for CVE-2026-47930

Vulnerability Analysis

The vulnerability resides in the input validation layer of Adobe ColdFusion. ColdFusion fails to properly validate input passed to a security-relevant code path. An authenticated attacker with low privileges can craft requests that the validation routine accepts as legitimate. Once the validation is bypassed, the attacker gains read and write access to resources that should remain restricted.

The issue is exploitable across the network and requires no user interaction. The Adobe advisory categorizes the outcome as a security feature bypass affecting confidentiality and integrity. Availability is not directly impacted according to the advisory.

Root Cause

The root cause is Improper Input Validation [CWE-20]. ColdFusion accepts input without enforcing the constraints expected by downstream security checks. This gap lets attacker-controlled values reach decision points that gate access to protected data and operations.

Attack Vector

The attack vector is network-based. An attacker who already holds a low-privileged ColdFusion account submits crafted HTTP requests to the server. The malformed input passes the validation routine and reaches code that grants access without re-checking authorization. The attacker then reads protected data or writes to resources controlled by higher-privileged users.

No verified public exploit code is available at the time of publication. Refer to the Adobe ColdFusion Security Advisory APSB26-64 for vendor technical detail.

Detection Methods for CVE-2026-47930

Indicators of Compromise

Unexpected read or write operations on ColdFusion administrative endpoints performed by low-privileged accounts
HTTP requests to ColdFusion services containing malformed or unexpected parameter structures targeting validation logic
File modifications under the ColdFusion web root or cfusion/wwwroot directories made by service accounts that normally do not write

Detection Strategies

Review ColdFusion access logs and application logs for authenticated requests that result in privilege-mismatched data access
Correlate authentication events with subsequent administrative actions performed by accounts lacking administrative roles
Deploy web application firewall rules that flag anomalous parameter encoding or unexpected request structures sent to ColdFusion endpoints

Monitoring Recommendations

Monitor ColdFusion server logs at cfusion/logs/ for repeated 4xx responses followed by successful 2xx responses on the same endpoint
Alert on outbound or lateral activity originating from the ColdFusion JVM process after suspicious authentication events
Track file integrity on ColdFusion configuration directories including cfusion/lib and CFM source paths

How to Mitigate CVE-2026-47930

Immediate Actions Required

Apply the updates referenced in Adobe Security Bulletin APSB26-64 to upgrade ColdFusion past versions 2023.19 and 2025.8
Inventory all ColdFusion instances, including development and staging servers, and verify their patch level
Audit ColdFusion user accounts and disable or rotate credentials for low-privileged accounts not actively in use

Patch Information

Adobe addresses CVE-2026-47930 in security advisory APSB26-64. Administrators must install the updated ColdFusion releases that supersede 2023.19 and 2025.8. Confirm the patched version after upgrade through the ColdFusion Administrator interface. Restart the ColdFusion service to ensure the updated input validation routines are loaded.

Workarounds

Restrict network access to ColdFusion Administrator and internal service endpoints using firewall rules or reverse proxy allow-lists
Place ColdFusion behind a web application firewall configured to inspect and normalize request parameters
Apply the principle of least privilege by removing unnecessary ColdFusion user accounts and reducing role assignments

bash

# Configuration example: restrict ColdFusion Administrator access at the reverse proxy
location /CFIDE/administrator/ {
    allow 10.0.0.0/24;
    deny all;
    proxy_pass http://coldfusion_backend;
}