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CVE-2026-48283 – Unrestricted File Upload leading to RCE – Adobe ColdFusion 2025 Update 9 and ear…

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Summary

CVE-2026-48283 is a critical Unrestricted Upload of File with Dangerous Type (CWE-434) vulnerability in Adobe ColdFusion, addressed in Adobe Security Bulletin APSB26-68 (published June 30, 2026). The flaw receives the maximum CVSS v3.1 base score of 10.0 and allows unauthenticated remote attackers to upload and execute arbitrary code on affected servers, with no user interaction required. Given Adobe ColdFusion’s well-documented history as a high-priority target for mass exploitation campaigns and advanced persistent threat (APT) activity, organizations running affected versions should treat this as an emergency patching event.

Technical details

  • Root cause: Insufficient validation of file types during upload operations allows an attacker to supply files with executable or otherwise dangerous extensions that the ColdFusion server will subsequently process or execute.
  • Trigger conditions: The vulnerability is reachable by any unauthenticated network-accessible attacker; no credentials and no victim interaction are required to trigger exploitation.
  • Attack vector: Remotely exploitable over the network (AV:N) with low attack complexity (AC:L), meaning no special conditions or race conditions need to be met.
  • Impact: Successful exploitation results in arbitrary code execution in the context of the ColdFusion server process. The scope is Changed (S:C), meaning impact is not limited to the vulnerable application — the hosting environment itself is at risk of full compromise. All three security pillars are maximally affected: full Confidentiality (C:H), Integrity (I:H), and Availability (A:H).

Affected software

  • Adobe ColdFusion 2025, Update 9 and earlier (versions up to and including 2025.9)
  • Adobe ColdFusion 2023, Update 20 and earlier (versions up to and including 2023.20)

Severity

CVSS v3.1 base score: 10.0 (Critical)
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate — apply vendor patches: Upgrade to Adobe ColdFusion 2025 Update 10 or Adobe ColdFusion 2023 Update 21, as specified in Adobe Security Bulletin APSB26-68.
  • JEE deployments: Adobe recommends applying the JVM security flags for JEE installations described in APSB26-68 to mitigate related deserialization risk.
  • Network-level mitigation (if patching is not immediately feasible): Restrict public network access to ColdFusion instances, particularly any file upload endpoints and the ColdFusion Administrator interface. Apply web application firewall rules to block upload requests with executable file extensions.
  • Prioritize internet-facing ColdFusion instances; attackers routinely scan the IPv4 address space for exposed ColdFusion servers, and prior mass exploitation campaigns have targeted this technology within hours of disclosure.

IONIX Status

The IONIX research team is tracking ongoing exploitation attempts and recommends immediate patching. Potentially affected assets are outlined in this post.

References

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