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CVE-2023-38203

9.8, critical Known exploited Used in ransomware

Adobe ColdFusion Deserialization of Untrusted Data Vulnerability

NVD (opens in a new tab) CVE.org (opens in a new tab) CISA KEV catalogue (opens in a new tab)
CVSS
9.8, critical critical CVSS v3.1
EPSS, next 30 days
97% higher than 99.8% of scored CVEs
Exploitation
Confirmed in the wild
Published
20 Jul 20233 years ago

Known exploited

CISA added this to the Known Exploited Vulnerabilities Catalog on 8 Jan 2024 and links it to ransomware activity. US federal agencies had to remediate by 29 Jan 2024, a deadline that has passed.

Required action. Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Description

Adobe ColdFusion versions 2018u17 (and earlier), 2021u7 (and earlier) and 2023u1 (and earlier) are affected by a Deserialization of Untrusted Data vulnerability that could result in Arbitrary code execution. Exploitation of this issue does not require user interaction.

Details

Vendor
Adobe
Product
ColdFusion
Weakness
CWE-502 (opens in a new tab)
Status
Analyzed
Updated
17 Jun 2026
Assigner
psirt@adobe.com

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References 2

Patches and fixes 1

Advisories 1

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other Adobe CVEs

Every Adobe CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2026-75650 Adobe Commerce and Magento Improper Neutralization of Special Elements Used in a Template Engine Vulnerability KEV EPSS 4% 10, critical
  • CVE-2026-71362 Adobe Commerce and Magento Incorrect Authorization Vulnerability KEV EPSS 88% 9.1, critical
  • CVE-2026-48282 Adobe ColdFusion Path Traversal Vulnerability KEV EPSS 42% 10, critical
  • CVE-2026-34621 Adobe Acrobat and Reader Prototype Pollution Vulnerability KEV EPSS 2% 8.6, high
  • CVE-2025-54236 Adobe Commerce and Magento Improper Input Validation Vulnerability KEV EPSS 95% 9.1, critical
  • CVE-2025-54253 Adobe Experience Manager Forms Code Execution Vulnerability KEV EPSS 88% 10, critical
  • CVE-2024-34102 Adobe Commerce and Magento Open Source Improper Restriction of XML External Entity Reference (XXE) Vulnerability KEV EPSS 100% 9.8, critical
  • CVE-2024-20767 Adobe ColdFusion Improper Access Control Vulnerability KEV EPSS 99% 7.4, high

Beyond this page

Is CVE-2023-38203 in your network?

This page tells you how dangerous CVE-2023-38203 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

CVE-2023-38203 is in the CISA catalogue of exploited vulnerabilities: attackers are already exploiting it.

  • EXYS7600 OCELOT

    Find it before attackers do

    Ocelot scans your network on a schedule and reports every vulnerability it finds by its CVE identifier, with its CVSS score and how many of your hosts are affected. A finding like CVE-2023-38203 comes with the devices to patch.

    Learn more about EXYS7600 OCELOT

  • EXYS7950 KONDRA

    Detect it if it's exploited

    Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.

    Learn more about EXYS7950 KONDRA
Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 17 Oct 2026, not the live upstream state.