CVE-2026-48276: Critical Adobe ColdFusion RCE

Detection and threat hunting

Detection should focus on three areas: upload activity, unexpected executable artifacts, and post-upload execution behavior. Because the public data does not name a specific endpoint, defenders need broad visibility into ColdFusion-backed applications and any reverse proxies in front of them. Review recent upload traffic, especially to rarely used application paths, admin functions, import features, or endpoints that accept uncommon file types.

You should also hunt for suspicious files written into web-accessible directories, temporary upload folders, archive extraction paths, and application roots. ColdFusion-specific abuse often leaves behind .cfm, .cfc, .jsp, .js, .zip, or disguised content uploaded with misleading MIME types. Even if the initial upload used an allowed extension, secondary extraction or rename behavior may create executable artifacts later in the chain.

Technical Notes

Concrete patterns to review include HTTP uploads that contain executable ColdFusion-related filenames or suspicious content types. Example grep patterns for access logs or reverse-proxy logs:

grep -Ei 'multipart/form-data|filename=|\.cfm|\.cfc|\.jsp|application/octet-stream' /var/log/nginx/access.log
grep -Ei 'POST .*upload|POST .*import|POST .*admin|filename=' /var/log/httpd/*access*

Example Splunk search for suspicious uploads against ColdFusion-backed services:

index=web sourcetype IN ("nginx:access","apache:access","iis")
(method=POST AND (uri_path="*upload*" OR uri_path="*import*" OR uri_path="*admin*"))
("multipart/form-data" OR "filename=" OR ".cfm" OR ".cfc" OR ".jsp")
| stats count values(uri_path) values(status) values(user_agent) by src_ip host

Example Sigma-style logic to adapt for file creation telemetry on the ColdFusion host:

title: Suspicious executable upload artifact on ColdFusion host
logsource:
  product: windows
  category: file_event
detection:
  selection:
    TargetFilename|contains:
      - '\ColdFusion'
      - '\wwwroot\'
    TargetFilename|endswith:
      - '.cfm'
      - '.cfc'
      - '.jsp'
  condition: selection
level: high

If you have EDR coverage, also hunt for child processes spawned by the ColdFusion service, servlet container, or Java process shortly after upload events. Even benign upload workflows should not normally be followed by shelling out, persistence changes, or outbound network beacons.

Mitigation and patching

The primary mitigation path is Adobe’s APSB26-68 bulletin and the corresponding ColdFusion 2025 and ColdFusion 2023 update tracks. The known vulnerable ranges are ColdFusion 2025.9 and earlier and ColdFusion 2023.20 and earlier. The exact fixed version number for this CVE was not conclusively confirmed from the fetched advisory content, so teams should verify the remediated build directly from Adobe before rollout. In the absence of that confirmation, assume that simply being on 2025.9 or 2023.20 is not sufficient, because NVD explicitly lists those versions as affected.

If you cannot patch immediately, reduce exposure around upload functionality. Restrict public access to ColdFusion applications that accept file uploads, especially administrative and internal-only workflows accidentally exposed through reverse proxies. Where possible, block direct internet access, require VPN or identity-aware proxy access, and ensure upload directories are not executable by the application server. Review whether uploaded content is being stored under any web-served path and move it outside executable roots if the application supports that.

Technical Notes

Before patching, identify the installed ColdFusion version from the host or application management process. On Linux, admins commonly verify package and install metadata via shell access, though exact commands vary by deployment method:

ps -ef | grep -i coldfusion
find /opt /usr/local -maxdepth 3 -type f \( -name "cfusion-info.properties" -o -name "neo-runtime.xml" \) 2>/dev/null

For update execution, use Adobe’s supported ColdFusion updater method for your installed branch after confirming the remediated version in APSB26-68. Because deployment methods vary, a safe operational pattern is:

# Example workflow, verify exact updater path and target build in Adobe documentation first
cd /opt/adobe/coldfusion/cfusion/bin
./coldfusion update

If your environment does not support immediate upgrade, use compensating controls such as reverse-proxy blocks for upload endpoints and stricter execution boundaries. Example NGINX hardening to block executable extensions from upload directories:

location ~* ^/uploads/.*\.(cfm|cfc|jsp)$ {
    deny all;
    return 403;
}

On Apache, restrict execution under known upload paths:

<Directory "/var/www/app/uploads">
    AllowOverride None
    Options -ExecCGI
    Require all denied
</Directory>

These workarounds are not substitutes for patching, especially when the exact vulnerable endpoint is unknown, but they can reduce blast radius during emergency response.

Prioritized response plan

First, inventory every ColdFusion instance in production, staging, and DR. Many organizations miss embedded or vendor-managed ColdFusion installs because ownership sits with application teams rather than infrastructure. Include external-facing systems first, but do not ignore internal apps reachable by contractors, VPN users, or compromised desktops.

Second, review Adobe APSB26-68 and confirm the first fixed build for each supported branch. Change management teams should prepare emergency deployment because the vulnerable ranges explicitly include 2025.9 and earlier and 2023.20 and earlier. While no verified exploitation is currently known from the provided sources, a critical no-user-interaction RCE on enterprise middleware deserves accelerated remediation and post-patch validation.

References

• NVD CVE record: CVE-2026-48276
• Adobe Security Bulletin APSB26-68
• Adobe ColdFusion 2025 updates page: ColdFusion 2025 Updates
• Adobe ColdFusion 2023 updates page: ColdFusion 2023 Updates
• Independent ColdFusion update tracker: ColdFusion Security Updates