CVE-2026-48276

This flaw lets an attacker upload a file type that shouldn’t be accepted. Think of it like leaving a “package drop box” that accepts not only normal deliveries, but also contraband that can harm your building. In ColdFusion, that can potentially lead to running malicious code on your server.

This matters if you use or host Adobe ColdFusion and your version is 2025.9, 2023.20, or earlier. It’s especially relevant for sites where an attacker could reach a file-upload feature exposed to the network, since exploitation does not require user interaction. If your ColdFusion instance is not reachable from the internet and no attacker can access the relevant upload functionality, the risk is reduced.

This is an AMBER issue: the vulnerability can enable high-impact outcomes (including code execution) and is reachable over the network. However, the provided findings do not show confirmed KEV listing or a clear dated real-world exploitation claim, and there’s no public exploit code on record. Treat it as a priority to patch soon, especially if you have any internet-reachable file upload features.

1. Confirm exposure (version):

   • Determine your exact ColdFusion version (Admin Console “About” page, or the installed build/version shown on startup/logs).
   • If you are on 2025.9, 2023.20, or earlier, you are within the affected range.

2. Identify the correct fixed release/patch:

   • Use Adobe’s official remediation for CVE-2026-48276 in APSB26-68: https://helpx.adobe.com/security/products/coldfusion/apsb26-68.html
   • Install the specific hotfix/patch package for your ColdFusion branch as directed in the advisory.

3. Upgrade/patch procedure:

   • Take an appropriate backup/snapshot of your ColdFusion configuration before applying the patch.
   • Apply APSB26-68 as instructed for your environment.
   • Restart ColdFusion after installation (per Adobe guidance).

4. Validate the fix:

   • After restart, re-check the ColdFusion version/build details to confirm APSB26-68’s update is present.
   • If your organization tracks change tickets, link the ticket to the advisory reference and the installed build number.

5. Temporary workaround if patching is delayed:

   • Reduce exposure of any upload endpoints: restrict access by network (allowlists/VPN), limit reachable routes, and ensure only required users can reach file upload functionality.
   • Tighten upload behavior where possible (restrict allowed file types and destinations) to reduce the chance of a dangerous upload succeeding.
   • Monitor web server and ColdFusion logs for unusual upload attempts or unexpected file-type upload patterns.

6. What to monitor after remediation:

   • Logs around upload requests and any errors related to upload handling.
   • Unexpected creation/modification of files in upload directories.
   • Any evidence of webshell-like behavior or new executable files in web-accessible paths.

CVE-2026-48276 is a ColdFusion vulnerability categorized as Unrestricted Upload of File with Dangerous Type (CWE-434). The findings indicate affected versions 2025.9, 2023.20 and earlier, with the issue enabling an attacker to upload a dangerous file type that can result in arbitrary code execution in the context of the current user, and that exploitation does not require user interaction. The KEV program does not list this vulnerability, and the provided reporting does not include a clear dated claim of exploitation in the wild; there is also no public exploit code on record. A patch is available via Adobe APSB26-68. The overall public risk signal is consistent with AMBER: high potential impact, but without confirmed KEV/news-driven exploitation evidence in the provided findings.