CVE-2026-48282: Adobe ColdFusion Path Traversal Flaw

CVE-2026-48282 Overview

Adobe ColdFusion contains a path traversal vulnerability that enables unauthenticated attackers to execute arbitrary code remotely. The flaw affects ColdFusion 2025.9, 2023.20, and all earlier releases in both branches. Adobe tracks the issue under security bulletin APSB26-68 and classifies it as an Improper Limitation of a Pathname to a Restricted Directory weakness [CWE-22]. Exploitation requires no user interaction and no prior privileges on the target server. A successful attack changes the security scope, allowing the attacker to reach resources beyond the vulnerable component and execute code in the context of the current user.

Critical Impact
Unauthenticated attackers can trigger arbitrary code execution across the network with no user interaction, and the vulnerability changes scope to affect components beyond the ColdFusion process.

Affected Products

Adobe ColdFusion 2025 through Update 9
Adobe ColdFusion 2023 through Update 20
All prior ColdFusion 2023 and 2025 update levels

Discovery Timeline

2026-06-30 - CVE-2026-48282 published to NVD
2026-07-01 - Last updated in NVD database

Technical Details for CVE-2026-48282

Vulnerability Analysis

The vulnerability is a path traversal flaw [CWE-22] in Adobe ColdFusion that escalates into remote arbitrary code execution. An attacker crafts a request that references file system paths using traversal sequences such as ../ to escape the intended restricted directory. Because ColdFusion processes the manipulated path without sufficient validation, the server reads or writes files outside the sanctioned scope. This primitive is chained to reach interpreter or deserialization surfaces, resulting in code execution under the ColdFusion service account. The scope change indicates that exploitation impacts resources managed by a different security authority than the vulnerable component. According to EPSS data from 2026-07-02, the vulnerability sits in the mid-tier of predicted exploitation likelihood, but the network-reachable and unauthenticated nature makes internet-facing servers high-priority targets.

Root Cause

ColdFusion accepts pathname input from remote clients and fails to canonicalize or restrict it to an allowed base directory. The application processes traversal characters literally, letting attacker-controlled input resolve to files anywhere the ColdFusion process can access.

Attack Vector

Attackers reach the vulnerability over the network by sending crafted HTTP requests to a ColdFusion endpoint. No authentication, credentials, or victim interaction are required. The attacker abuses the path traversal to place or reference content that ColdFusion then executes, achieving arbitrary code execution in the server context.

No verified public proof-of-concept code was available at the time of publication. Refer to the Adobe ColdFusion Security Advisory APSB26-68 for vendor-supplied technical detail.

Detection Methods for CVE-2026-48282

Indicators of Compromise

HTTP requests to ColdFusion endpoints containing traversal sequences such as ../, ..\, or URL-encoded variants like %2e%2e%2f and %2e%2e%5c.
Unexpected files written under cfusion/wwwroot, cfusion/lib, or ColdFusion administrator directories.
Child processes spawned by the ColdFusion Java process (coldfusion.exe, jrun.exe, or java running ColdFusion classes) that launch cmd.exe, powershell.exe, or /bin/sh.
Outbound connections from the ColdFusion service to unfamiliar IP addresses shortly after suspicious request activity.

Detection Strategies

Inspect web server and ColdFusion access logs for traversal patterns targeting administrator, component, or file handler endpoints.
Alert on process lineage where the ColdFusion JVM spawns command interpreters or scripting engines.
Baseline file integrity on ColdFusion installation directories and flag new .cfm, .cfc, .jsp, or .class files.

Monitoring Recommendations

Forward ColdFusion, IIS, and Apache logs to a central analytics platform and retain them long enough to support retrospective hunts.
Monitor authentication and authorization events on the operating system account running ColdFusion for anomalous file access.
Track egress traffic from ColdFusion hosts to detect post-exploitation command-and-control activity.

How to Mitigate CVE-2026-48282

Immediate Actions Required

Apply the security updates referenced in Adobe bulletin APSB26-68 to all ColdFusion 2025 and 2023 installations.
Inventory ColdFusion hosts, confirm current update level, and prioritize any instances exposed to the internet.
Restrict inbound access to ColdFusion administrator and component endpoints using network ACLs or a web application firewall.
Review web and application logs from before patch deployment for the traversal indicators listed above.

Patch Information

Adobe published fixed builds through the Adobe ColdFusion Security Advisory APSB26-68. Administrators must upgrade beyond ColdFusion 2025 Update 9 and ColdFusion 2023 Update 20 to the versions specified in the advisory. Restart the ColdFusion service after applying the update and validate the reported build number in the administrator console.

Workarounds

Block traversal sequences (../, ..\, %2e%2e%2f, %2e%2e%5c) at the reverse proxy or web application firewall until patches are applied.
Run the ColdFusion service under a least-privilege account and revoke write permissions on directories that do not require them.
Disable or firewall the ColdFusion Administrator interface from untrusted networks.
Enforce ColdFusion sandbox security to constrain file system access for CFML applications.

bash

# Example: block common path traversal patterns at an Nginx reverse proxy in front of ColdFusion
location / {
    if ($request_uri ~* "(\.\./|\.\.\\|%2e%2e%2f|%2e%2e%5c)") {
        return 403;
    }
    proxy_pass http://coldfusion_backend;
}