---
id: "CVE-2018-4939"
kind: "vulnerability"
aliases: ["CVE-2018-4939"]
title: "Adobe ColdFusion: Adobe ColdFusion Deserialization of Untrusted Data Vulnerability"
severity: "critical"
cvss: 10.0
epss: 0.61987
exploited: true
status: "open"
category: "runtime"
products: [{"name": "Adobe ColdFusion", "fixed": [], "affected": "", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["coldfusion", "exploited", "runtime", "self-hosted", "windows"]
not_affected_if: ["managed-hosting"]
published_at: "2018-05-19T17:29:01+00:00"
first_seen_at: "2026-10-23T19:11:53+00:00"
updated_at: "2026-10-23T21:57:35+00:00"
sources: [{"source": "kev", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2018-4939", "first_seen_at": "2026-10-23T19:11:53+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2018-4939", "first_seen_at": "2026-10-23T19:13:44+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2018-4939", "first_seen_at": "2026-10-23T21:57:35+00:00"}]
---

# Adobe ColdFusion: Adobe ColdFusion Deserialization of Untrusted Data Vulnerability

Adobe ColdFusion deserializes untrusted data without checks, letting a crafted request run code on the server. An attacker who reaches the server gets code execution there, and CISA lists it as exploited in the wild.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:Adobe ColdFusion affected ? fixed ?

## Fix

Apply the Adobe ColdFusion updates for this CVE per vendor instructions; exact fixed build numbers are not in the sources.

## Timeline

- 2026-10-23T19:11:53+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2018-4939
- 2026-10-23T19:13:44+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2018-4939
- 2026-10-23T21:57:35+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2018-4939

## From the sources

Adobe ColdFusion Update 5 and earlier versions, ColdFusion 11 Update 13 and earlier versions have an exploitable Deserialization of Untrusted Data vulnerability. Successful exploitation could lead to arbitrary code execution.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_