10 mincritical
It’s 37oC, And All We Can Think About Is ColdFusion (Adobe ColdFusion Security Bulletin APSB26-68 CVE Bonanza)
Adobe ColdFusion security bulletin APSB26-68 patches 11 CVEs across ColdFusion 2025 and 2023, including critical arbitrary file read/write vulnerabilities in the RDS module and a path traversal in the CKEditor file manager upload endpoint. When RDS is enabled with authentication disabled, attackers can use the simple length-prefixed RDS RPC protocol to read or write arbitrary files, achieving remote code execution as SYSTEM by deploying a CFML webshell. A separate unauthenticated path traversal in the CKEditor file manager allows file uploads to arbitrary directories, also executing as SYSTEM.
Sens:■ ImmediateConf:medium
Detection / Hunteropenrouter
What Happened
Researchers found multiple serious security flaws in Adobe ColdFusion, a platform for building websites. The most dangerous ones let attackers read or write any file on the server without needing a password, as long as a feature called RDS (Remote Development Services) is turned on without authentication. Attackers can use this to upload a malicious web page that gives them full control of the server, running commands with the highest privileges. A separate flaw in a built-in file manager tool also lets attackers upload files to any location on the server. Anyone running affected versions of ColdFusion should apply the latest updates immediately and make sure RDS is either disabled or requires authentication.
Key Takeaways
- Adobe ColdFusion 2025 (Update 9 and below) and 2023 (Update 20 and below) contain multiple critical vulnerabilities including arbitrary file read, write, and code execution via the RDS module and CKEditor file manager.
- The RDS (Remote Development Services) protocol allows unauthenticated file read/write/move/delete operations when RDS is enabled with authentication disabled, leading to trivial RCE by writing a CFML webshell to the webroot.
- A separate path traversal vulnerability in the CKEditor file manager upload endpoint allows unauthenticated file uploads to arbitrary directories, with files written as NT AUTHORITY\SYSTEM.
- The patch introduces canonical path resolution via RdsFileSecurity.resolveCanonical() to block absolute paths and directory traversal sequences in RDS file operations.
- Additional vulnerabilities in CFML tags (cffeed, cfpop, cfimap, cfexchangemail, cfexchangeconnection, cfwebsocket, cffile) related to XSLT, SSRF, XXE, and file write require custom .cfm pages using those tags, making exploitation less likely in practice.
Affected Systems
- Adobe ColdFusion 2025 (Update 9 and below)
- Adobe ColdFusion 2023 (Update 20 and below)
Vulnerabilities (CVEs)
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| CVE | Product | Severity | Description |
|---|---|---|---|
| CVE-2026-48276 | Adobe ColdFusion CKEditor file manager | Critical | Arbitrary code execution via path traversal in file upload endpoint, allowing unauthenticated upload of files to arbitrary directories as SYSTEM. |
| CVE-2026-48277 | Adobe ColdFusion | Arbitrary code execution; specific details not analyzed in the article. | |
| CVE-2026-48281 | Adobe ColdFusion | Arbitrary code execution; specific details not analyzed in the article. | |
| CVE-2026-48316 | Adobe ColdFusion | Arbitrary code execution; specific details not analyzed in the article. | |
| CVE-2026-48282 | Adobe ColdFusion RDS FileServlet | Critical | Arbitrary file write via RDS protocol enabling unauthenticated attackers to write files (including webshells) to arbitrary paths, leading to remote code execution. |
| CVE-2026-48283 | Adobe ColdFusion | Arbitrary code execution; specific details not analyzed in the article. | |
| CVE-2026-48313 | Adobe ColdFusion RDS FileServlet | High | Arbitrary file system read via RDS protocol allowing unauthenticated attackers to read arbitrary files from the server filesystem. |
| CVE-2026-48315 | Adobe ColdFusion | Privilege escalation; specific details not analyzed in the article. | |
| CVE-2026-48307 | Adobe ColdFusion | Arbitrary code execution; specific details not analyzed in the article. | |
| CVE-2026-48285 | Adobe ColdFusion | Security feature bypass; specific details not analyzed in the article. | |
| CVE-2026-48314 | Adobe ColdFusion | Privilege escalation; specific details not analyzed in the article. |
Attack Chain
- Initial Access: Attacker accesses the RDS endpoint /CFIDE/main/ide.cfm or CKEditor upload endpoint on a ColdFusion server with RDS enabled and authentication disabled
- File Read/Discovery: Attacker sends a length-prefixed RDS protocol request with ACTION=FILEIO to read arbitrary files from the server filesystem
- File Write/Persistence: Attacker sends an RDS WRITE request to write a CFML webshell (e.g., shell.cfm) to the ColdFusion webroot directory
- Execution: Attacker accesses the deployed webshell via HTTP GET, triggering command execution as NT AUTHORITY\SYSTEM
- Alternative Path: Attacker exploits path traversal in CKEditor file manager upload endpoint to upload files to arbitrary directories without authentication
Detection Availability
- YARA Rules: No
- Sigma Rules: No
- Snort/Suricata Rules: No
- KQL Queries: No
- Splunk SPL Queries: No
- EQL Queries: No
- Other Detection Logic: No
No detection rules are provided in the article. The article includes proof-of-concept HTTP requests and Java code diffs but no formal detection logic.
Detection Engineering Assessment
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| Dimension | Rating | Rationale |
|---|---|---|
| EDR Visibility | Medium | EDR would likely see webshell execution (cmd.exe spawned by the ColdFusion Java process) and child processes like calc.exe running as SYSTEM, but the initial file write via the RDS protocol occurs within the web application layer and may not generate distinctive EDR telemetry. |
| Network Visibility | High | The RDS protocol uses HTTP POST requests to /CFIDE/main/ide.cfm with application/octet-stream content type and a distinctive length-prefixed binary body format. WAF or network IDS could detect these patterns and path traversal payloads in CKEditor upload requests. |
| Detection Difficulty | Moderate | The RDS protocol has a distinctive URL pattern and content type that can be signatured. Path traversal payloads in the CKEditor upload endpoint are detectable via WAF rules. However, distinguishing legitimate RDS usage from malicious usage may generate false positives in environments where RDS is intentionally enabled. |
Required Log Sources
- ColdFusion application logs
- Web server access logs (IIS/Apache)
- WAF logs
- EDR process creation and file write telemetry
- Network IDS/IPS logs
Hunting Hypotheses
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| Hypothesis | Telemetry | ATT&CK Stage | FP Risk |
|---|---|---|---|
| Consider hunting for HTTP POST requests to /CFIDE/main/ide.cfm with ACTION=FILEIO and application/octet-stream content type, which may indicate RDS file operations being performed by an attacker. | Web server access logs, WAF logs, network proxy logs | Initial Access | Medium — legitimate RDS usage by developers or ColdFusion Builder will generate similar requests; correlate with source IP reputation and timing. |
| Consider hunting for .cfm files written to the ColdFusion webroot directory by the ColdFusion Java process, which may indicate webshell deployment via the RDS file write primitive. | EDR file write events, filesystem auditing logs | Persistence | Low to Medium — legitimate application deployments may write .cfm files, but writes initiated via the RDS endpoint are unusual in production. |
| Consider hunting for child processes of the ColdFusion Java process (e.g., cmd.exe, powershell.exe, calc.exe) spawned via cfexecute, which may indicate webshell-driven command execution. | EDR process creation events with parent process analysis | Execution | Low — ColdFusion applications using cfexecute legitimately are rare in production environments. |
| Consider hunting for HTTP requests to the CKEditor file manager upload endpoint containing path traversal sequences (../) in the path parameter, which may indicate exploitation of the path traversal vulnerability. | Web server access logs, WAF logs | Initial Access | Low — path traversal sequences in upload parameters are almost always malicious. |
| Consider hunting for files uploaded via the CKEditor file manager with extensions such as .war, .jspf, or .cfmail, which were specifically added to the blocklist in the patch, suggesting they may be used for exploitation. | Web server access logs, EDR file write events | Persistence | Low — these extensions are unusual for legitimate file manager uploads. |
Control Gaps
- WAF rules may not cover the RDS protocol's custom binary format, allowing file read/write operations to bypass signature-based detection.
- Network-level controls may not inspect the length-prefixed RDS body content for malicious file paths.
- File integrity monitoring may not alert on new .cfm files in the webroot if not specifically configured for ColdFusion directories.
Key Behavioral Indicators
- HTTP POST to /CFIDE/main/ide.cfm with ACTION=FILEIO and Content-Type: application/octet-stream
- Length-prefixed binary body in requests to ide.cfm containing file paths and operation names (READ, WRITE, RENAME, REMOVE)
- HTTP requests to /cf_scripts/scripts/ajax/ckeditor/plugins/filemanager/upload.cfm with path traversal sequences in the path parameter
- ColdFusion Java process spawning cmd.exe or other command interpreters via cfexecute
- New .cfm files appearing in the ColdFusion webroot directory (e.g., C:\ColdFusion2025\cfusion\wwwroot)
- Files written as NT AUTHORITY\SYSTEM via the CKEditor upload endpoint
False Positive Assessment
- Medium — legitimate RDS usage by developers or ColdFusion Builder IDE will generate similar traffic patterns to malicious use. The CKEditor file manager path traversal detection has lower false positive risk since traversal sequences in upload paths are inherently suspicious. Process spawning via cfexecute has low false positive potential as this tag is rarely used in production applications.
Recommendations
Immediate Mitigation
- Verify against your organization's incident response runbook and team escalation paths before acting. Consider applying Adobe ColdFusion updates immediately — Update 10+ for ColdFusion 2025 and Update 21+ for ColdFusion 2023.
- If RDS is not required in your environment, consider disabling it entirely via the ColdFusion Administrator security settings.
- If RDS must remain enabled, ensure authentication is enforced rather than set to 'No authentication needed'.
- Consider verifying that file uploads are disabled in the CKEditor file manager settings (AllowUploads = false) if the file manager is not needed.
- Consider blocking or restricting access to /CFIDE/main/ide.cfm and /cf_scripts/scripts/ajax/ckeditor/plugins/filemanager/ at the WAF or reverse proxy level if these endpoints are not required.
Infrastructure Hardening
- Evaluate whether ColdFusion administration interfaces and RDS endpoints should be network-segmented away from internet-facing exposure.
- Consider implementing WAF rules to detect and block path traversal sequences in parameters to CKEditor file manager endpoints.
- If supported by your web server, consider restricting the ColdFusion webroot to read-only for the application process where feasible, preventing webshell writes.
- Consider running ColdFusion with a least-privilege service account rather than NT AUTHORITY\SYSTEM to limit the impact of successful exploitation.
User Protection
- Consider deploying file integrity monitoring on ColdFusion webroot directories to detect newly written .cfm files that may be webshells.
- If your EDR supports process ancestry monitoring, consider alerting on command interpreters (cmd.exe, powershell.exe) spawned by the ColdFusion Java process.
- Evaluate whether your WAF can inspect and block the RDS protocol's application/octet-stream payloads targeting ide.cfm.
Security Awareness
- Consider reminding ColdFusion administrators about the risks of enabling RDS without authentication, as highlighted in Adobe's own documentation.
- Consider incorporating the dangers of enabling file upload features in web applications into existing developer security training programs.
- If applicable, consider notifying development teams that RDS and CKEditor file manager features should not be enabled in production environments without strong access controls.
MITRE ATT&CK Mapping
- T1190 - Exploit Public-Facing Application
- T1505.003 - Server Software Component: Web Shell
- T1083 - File and Directory Discovery
- T1105 - Ingress Tool Transfer
Additional IOCs
- Urls:
/CFIDE/main/ide.cfm?ACTION=FILEIO- RDS endpoint for file read/write/move/delete operations; targeted for arbitrary file read and write leading to RCE./cf_scripts/scripts/ajax/ckeditor/plugins/filemanager/upload.cfm- CKEditor file manager upload endpoint vulnerable to path traversal, allowing unauthenticated file upload to arbitrary directories./cf_scripts/scripts/ajax/ckeditor/plugins/filemanager/filemanager.cfc?method=getfmfiles- CKEditor file manager endpoint vulnerable to arbitrary directory listing via path traversal in the path parameter.
- File Paths:
C:\ColdFusion2025\cfusion\wwwroot\shell.cfm- Example webshell path written by attacker via RDS file write to achieve RCE; attacker-chosen filename in the ColdFusion webroot.
- Command Lines:
- Purpose: Webshell execution via CFML cfexecute tag invoking cmd.exe | Tools:
cmd.exe,calc.exe| Stage: Execution |<cfexecute name="cmd.exe" arguments="/c
- Purpose: Webshell execution via CFML cfexecute tag invoking cmd.exe | Tools: