CVE-2025-61823: 
Adobe ColdFusion vulnerability analysis and mitigation

CVE-2025-61823 is an Improper Restriction of XML External Entity Reference (XXE) vulnerability in Adobe ColdFusion that allows arbitrary file system reads. It affects ColdFusion versions 2025.4, 2023.16, 2021.22 and earlier across all three supported release lines. The vulnerability was published on December 9, 2025, with NVD initial analysis completed on December 12, 2025. It carries a CVSS v3.1 base score of 6.2 (Medium), assigned by Adobe (Adobe Advisory, NVD).

The vulnerability is classified as CWE-611 (Improper Restriction of XML External Entity Reference), where the application fails to properly restrict the processing of XML external entities in user-supplied input. An attacker can craft a malicious XML payload containing an external entity reference pointing to sensitive files on the server's file system, which ColdFusion then resolves and returns in its response. Exploitation requires the attacker to have high privileges on the ColdFusion instance and also requires user interaction, with the scope of impact extending beyond the vulnerable component itself (Adobe Advisory, NVD).

Successful exploitation results in a high confidentiality impact, enabling an attacker to read arbitrary files from the server's file system, potentially exposing sensitive configuration files, credentials, application source code, or other data stored on the host. Integrity and availability are not directly impacted by this vulnerability. Because the scope is marked as changed, the impact can extend beyond the ColdFusion application itself to other components or data on the underlying server (Adobe Advisory, NVD).

1. Reconnaissance: Identify internet-facing Adobe ColdFusion instances running versions 2021.22 or earlier, 2023.16 or earlier, or 2025.4 or earlier using tools like Shodan or Censys.
2. Obtain high-privileged access: Acquire administrative or high-privileged credentials for the ColdFusion Administrator interface, either through credential theft, phishing, or reuse of compromised credentials.
3. Trigger user interaction: Leverage social engineering or an existing session to cause a privileged user to interact with a crafted request or upload a malicious XML document.
4. Craft malicious XML payload: Construct an XML document containing an external entity declaration referencing a sensitive local file (e.g., <!DOCTYPE foo [<!ENTITY xxe SYSTEM "file:///etc/passwd">]><foo>&xxe;</foo>).
5. Submit payload: Submit the crafted XML to a ColdFusion endpoint that processes XML input without properly restricting external entity resolution.
6. Retrieve sensitive data: The server resolves the external entity and returns the contents of the targeted file in its response, exposing sensitive data such as configuration files, credentials, or application secrets (Adobe Advisory, NVD).

• Network: Unusual outbound or inbound XML-heavy HTTP requests to ColdFusion endpoints from high-privileged accounts; responses containing unexpected file content (e.g., /etc/passwd, web.xml, or Windows system files).
• Logs: ColdFusion server logs showing XML parsing activity with external entity references (e.g., SYSTEM "file:///..." patterns in request bodies); error logs indicating failed file access attempts from the XML parser.
• File System: No direct file system artifacts expected from a read-only XXE attack, but evidence of reconnaissance may appear in accessed file audit logs if OS-level auditing is enabled.
• Process: Unusual ColdFusion Java process activity related to file I/O operations triggered by XML parsing, particularly accessing files outside the web root (NVD).

Adobe has released patches addressing this vulnerability: users should update to ColdFusion 2025 Update 5, ColdFusion 2023 Update 17, or ColdFusion 2021 Update 23 or later, as referenced in the Adobe security bulletin APSB25-105. As a general workaround, administrators should disable external entity processing in XML parsers where possible and restrict access to the ColdFusion Administrator to trusted networks only. Applying the principle of least privilege to ColdFusion service accounts can also limit the impact of successful exploitation (Adobe Advisory).

The vulnerability was noted in Sophos's December 2025 Patch Tuesday roundup, which covered Adobe's broader set of December 2025 security updates (Sophos Blog). The Center for Internet Security (CIS) issued an advisory noting that multiple vulnerabilities in Adobe products patched in December 2025 could allow for arbitrary code execution and other impacts (CIS Advisory). No significant independent researcher commentary or social media discussion specific to CVE-2025-61823 has been identified beyond standard vulnerability tracking coverage.