CVE-2026-47931 Overview
CVE-2026-47931 is an Improper Input Validation vulnerability [CWE-20] affecting Adobe ColdFusion versions 2023.19, 2025.8, and earlier. Successful exploitation allows arbitrary code execution in the context of the current user. The flaw does not require user interaction and results in a scope change, meaning impact extends beyond the vulnerable component. An attacker must have high privileges and adjacent network access to exploit the issue.
Critical Impact
Arbitrary code execution on affected ColdFusion servers without user interaction, with potential to impact resources beyond the vulnerable application.
Affected Products
- Adobe ColdFusion 2023, version 2023.19 and earlier
- Adobe ColdFusion 2025, version 2025.8 and earlier
- Deployments exposing ColdFusion services to adjacent network segments
Discovery Timeline
- 2026-06-09 - CVE-2026-47931 published to NVD
- 2026-06-10 - Last updated in NVD database
Technical Details for CVE-2026-47931
Vulnerability Analysis
The vulnerability stems from improper validation of input processed by Adobe ColdFusion. ColdFusion fails to adequately sanitize or constrain certain input before it is handled by application logic. An authenticated attacker on an adjacent network can submit crafted input that the server processes unsafely. The result is arbitrary code execution running with the privileges of the current ColdFusion user.
Because the scope is changed, the attacker can affect components beyond the ColdFusion process itself. This expands the blast radius to other services, files, or data on the host or trusted systems. The Exploit Prediction Scoring System (EPSS) currently rates the probability of exploitation as low, but the impact remains high once preconditions are met.
Root Cause
The root cause is improper input validation [CWE-20] in ColdFusion request handling paths. The server accepts input that should be rejected or normalized and passes it to downstream operations capable of executing code. Adobe has not publicly disclosed the specific component or parser at fault. Refer to the Adobe ColdFusion Security Advisory APSB26-64 for vendor details.
Attack Vector
Exploitation requires adjacent network access and high privileges on the target. The attacker sends crafted requests to a vulnerable ColdFusion endpoint over the local network segment. No user interaction is needed. Because scope changes, the executed code can act on resources outside the vulnerable process boundary, including other applications or data on the same host.
No public proof-of-concept or in-the-wild exploitation has been reported. The vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog.
Detection Methods for CVE-2026-47931
Indicators of Compromise
- Unexpected child processes spawned by coldfusion.exe, jrun.exe, or the ColdFusion Java process
- New or modified .cfm, .cfc, or .jsp files in ColdFusion webroots without change-control records
- Outbound network connections originating from the ColdFusion service to untrusted hosts
Detection Strategies
- Monitor ColdFusion administrator and application logs for malformed requests, parser errors, or repeated 500-class responses from adjacent hosts
- Alert on process lineage where the ColdFusion service launches shell interpreters such as cmd.exe, powershell.exe, or /bin/sh
- Inspect HTTP request bodies and headers for anomalous payloads targeting ColdFusion endpoints on the adjacent network
Monitoring Recommendations
- Enable verbose ColdFusion application and server logging and forward to a centralized SIEM for correlation
- Track authentication events to the ColdFusion Administrator and flag privileged sessions originating from unusual subnets
- Baseline normal file write activity in ColdFusion webroots and alert on deviations
How to Mitigate CVE-2026-47931
Immediate Actions Required
- Apply the security updates referenced in the Adobe ColdFusion Security Advisory APSB26-64 as soon as available
- Restrict adjacent network access to ColdFusion management and application endpoints using firewall rules and network segmentation
- Audit ColdFusion accounts and revoke unnecessary high-privilege access
Patch Information
Adobe addressed CVE-2026-47931 in the security update tracked as APSB26-64. Administrators should upgrade ColdFusion 2023 to a version later than 2023.19 and ColdFusion 2025 to a version later than 2025.8. Confirm the installed update by checking the ColdFusion Administrator System Information page after patching.
Workarounds
- Place ColdFusion behind a Web Application Firewall configured to inspect and reject malformed requests to ColdFusion endpoints
- Disable or restrict access to ColdFusion components and services that are not required by the application
- Enforce strict allowlists for source IP ranges that may reach ColdFusion services
# Configuration example: restrict ColdFusion service to trusted management subnet (iptables)
iptables -A INPUT -p tcp --dport 8500 -s 10.10.50.0/24 -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.
