CVE-2023-38203: Adobe ColdFusion Deserialization of Untrusted Data Vulnerability
- Is it exploited?
Yes. CISA added it to the Known Exploited Vulnerabilities catalog on , 172 days after the CVE record was published.
- How likely is exploitation in the next 30 days?
- 97.1%
EPSS score, percentile 99.9 of all scored records
- How severe?
- 9.8 Critical
CVSS v3.1 base score, given by the CNA
- What should I do?
CISA deadline . Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
- Which versions are affected?
Affected
- cf2023U1 and earlier
Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of ; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of ; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of . About the data.
What to do
Required action, set by CISA
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
CISA due date for this action: .
Advisories and patches
Linked from CISA's catalog entry
- https://helpx.adobe.com/security/products/coldfusion/apsb23-41.html
- https://nvd.nist.gov/vuln/detail/CVE-2023-38203
Affected products and versions
As listed in the CVE record.
| Status | Versions |
|---|---|
| Affected | cf2023U1 and earlier |
Versions not listed are: affected.
Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of . About the data.
About this vulnerability
Adobe ColdFusion contains a deserialization of untrusted data vulnerability that allows for code execution.
Summary: CISA's KEV catalog, as of .
- CISA added CVE-2023-38203 to its Known Exploited Vulnerabilities (KEV) catalog on 8 Jan 2024.
- CISA marks it as known to be used in ransomware campaigns.
- The due date CISA sets for the required action is 29 Jan 2024.
- The CVE record was published on 20 Jul 2023, 172 days before it was added to KEV.
- The CVE record carries a CVSS v3.1 base score of 9.8 (Critical), given by its CNA.
- FIRST's EPSS model puts the probability of exploitation in the next 30 days at 97.1% (percentile 99.9), as of 28 Oct 2026.
- CISA's SSVC assessment in the CVE record: exploitation active, automatable yes, technical impact total.
Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of ; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of ; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of . About the data.
Description
Analysis CVE-2023-29300 Bypass: Adobe ColdFusion Pre-Auth RCE
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.
Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of . About the data.
Weakness
CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record and the KEV entry.
Timeline
| Date | Event |
|---|---|
| CVE record published | |
| Added to CISA KEV | |
| CISA due date for the required action | |
| CVE record last updated |
More exploited Adobe vulnerabilities
- CVE-2026-48356: Adobe Commerce and Magento Unrestricted Upload of File with Dangerous Type Vulnerability
- CVE-2026-71362: Adobe Commerce and Magento Incorrect Authorization Vulnerability
- CVE-2026-75650: Adobe Commerce and Magento Improper Neutralization of Special Elements Used in a Template Engine Vulnerability
- CVE-2026-48282: Adobe ColdFusion Path Traversal Vulnerability
- CVE-2009-3459: Adobe Acrobat and Reader Heap-Based Buffer Overflow Vulnerability
- CVE-2020-9715: Adobe Acrobat Use-After-Free Vulnerability