CVE-2026-48284 Overview
Adobe ColdFusion contains an improper input validation vulnerability that enables arbitrary code execution in the context of the current user. The flaw affects ColdFusion 2023 (through Update 21) and ColdFusion 2025 (through Update 10). Exploitation requires no user interaction and can be triggered remotely by an authenticated attacker with low privileges. The scope is changed, meaning successful exploitation can impact resources beyond the vulnerable component's security authority. Adobe published the fix in security advisory APSB26-82.
Critical Impact
An authenticated remote attacker can execute arbitrary code on the ColdFusion server, potentially leading to full application compromise and lateral movement across trusted components.
Affected Products
- Adobe ColdFusion 2023 (base release through Update 21)
- Adobe ColdFusion 2025 (base release through Update 10)
- Deployments running affected ColdFusion instances on Windows and Linux hosts
Discovery Timeline
- 2026-07-14 - CVE-2026-48284 published to NVD
- 2026-07-15 - Last updated in NVD database
Technical Details for CVE-2026-48284
Vulnerability Analysis
The vulnerability is classified as Improper Input Validation ([CWE-20]). ColdFusion fails to properly validate untrusted input before processing it in a code execution path. Because the scope is changed, an attacker can affect components beyond the vulnerable module. This behavior maps to Arbitrary Code Execution scenarios where injected payloads reach an interpreter or deserialization sink without adequate sanitization. The vulnerability applies to both the 2023 and 2025 release trains, indicating the flawed input validation logic persists across major versions.
Root Cause
ColdFusion does not enforce sufficient constraints on attacker-supplied input reaching a sensitive processing routine. Missing validation on data type, structure, or content allows malicious payloads to escape the intended processing context. Adobe's advisory identifies the root cause as improper input validation, consistent with [CWE-20]. Specific vulnerable functions were not disclosed in the public advisory to reduce exploitation risk.
Attack Vector
The attack vector is network-based. An authenticated attacker with low privileges sends a crafted request to an exposed ColdFusion endpoint. No user interaction is required. Because ColdFusion is commonly deployed as an internet-facing application server, exposed instances are directly reachable by attackers who have obtained low-privilege credentials through phishing, credential stuffing, or previous compromises.
No public proof-of-concept exploit is currently available. See the Adobe ColdFusion Security Advisory APSB26-82 for vendor guidance.
Detection Methods for CVE-2026-48284
Indicators of Compromise
- Unexpected child processes spawned by the ColdFusion service account (cfusion, coldfusion.exe, or jrun.exe)
- New or modified .cfm, .cfc, or .jsp files in web root directories outside normal deployment windows
- Outbound network connections from the ColdFusion JVM to unfamiliar external hosts
- Anomalous POST requests to ColdFusion administrative or component endpoints from low-privileged accounts
Detection Strategies
- Monitor ColdFusion application logs and IIS/Apache access logs for malformed input targeting CFML component invocation endpoints
- Baseline the process tree of the ColdFusion service and alert on deviations such as shell or scripting interpreter execution
- Inspect authentication logs for low-privilege accounts issuing administrative or component-level requests
Monitoring Recommendations
- Enable verbose logging on ColdFusion Administrator and API endpoints, then forward events to a centralized SIEM
- Track file integrity across ColdFusion web roots and WEB-INF directories
- Correlate authentication events with subsequent request patterns to detect post-authentication exploitation attempts
How to Mitigate CVE-2026-48284
Immediate Actions Required
- Apply the security updates referenced in Adobe advisory APSB26-82 to all ColdFusion 2023 and 2025 instances
- Rotate credentials for any low-privileged ColdFusion accounts, particularly those with API or administrative access
- Restrict network exposure of the ColdFusion Administrator and component endpoints to trusted management networks
- Audit ColdFusion servers for signs of prior exploitation, including unexpected files and processes
Patch Information
Adobe released patched versions for ColdFusion 2023 and ColdFusion 2025 as documented in the Adobe ColdFusion Security Advisory APSB26-82. Administrators must upgrade beyond ColdFusion 2023 Update 21 and ColdFusion 2025 Update 10 to remediate this issue.
Workarounds
- Place ColdFusion instances behind a web application firewall configured to block anomalous requests to CFML component endpoints
- Enforce the principle of least privilege by removing unnecessary low-privileged accounts capable of authenticating to ColdFusion
- Run the ColdFusion service under a dedicated non-administrative account to limit the blast radius of code execution
- Block outbound network traffic from ColdFusion hosts except to explicitly required destinations
# Example: restrict ColdFusion Administrator access to a management subnet (iptables)
iptables -A INPUT -p tcp --dport 8500 -s 10.10.20.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 8500 -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
