CVE-2026-48440: 
Adobe ColdFusion vulnerability analysis and mitigation

CVE-2026-48440 is a heap-based buffer overflow vulnerability (CWE-122) in Adobe ColdFusion that could result in arbitrary code execution in the context of the current user. It affects ColdFusion 2023 (versions up to and including 2023.0.22 / Update 22) and ColdFusion 2025 (versions up to and including 2025.0.11 / Update 11). The vulnerability was disclosed and patched on August 11, 2026, with Adobe releasing security bulletin APSB26-90. It carries a CVSS v3.1 base score of 8.1 (High), reflecting network-based exploitation with high attack complexity and no user interaction required (Adobe Advisory).

The vulnerability is classified as CWE-122 (Heap-based Buffer Overflow), where insufficient bounds checking on heap-allocated memory allows an attacker to write data beyond the allocated buffer. Exploitation is network-based and requires no authentication or user interaction, but depends on conditions beyond the attacker's control (high attack complexity), such as specific memory layout or race conditions. The associated CAPEC pattern is CAPEC-92 (Forced Integer Overflow), suggesting the overflow may be triggered via crafted input that causes an integer miscalculation leading to an undersized heap allocation. No public proof-of-concept code has been identified at this time (Adobe Advisory).

Successful exploitation allows an unauthenticated remote attacker to execute arbitrary code in the context of the ColdFusion server process, resulting in high confidentiality, integrity, and availability impact. An attacker achieving code execution on a ColdFusion server could access sensitive application data, modify or destroy hosted content, pivot to internal network resources, or establish persistent access. The total technical impact classification from NVD's SSVC assessment confirms full system compromise potential (Adobe Advisory).

As of the disclosure date, there is no evidence of public proof-of-concept exploit code or active in-the-wild exploitation. NVD's SSVC assessment classifies exploitation as "none" and the vulnerability as non-automatable due to the high attack complexity requirement. The EPSS score is approximately 0.618%, indicating a low near-term probability of exploitation. The vulnerability has not been added to CISA's Known Exploited Vulnerabilities (KEV) catalog as of the time of this report (Adobe Advisory).

Adobe has released patches addressing this vulnerability: ColdFusion 2023 Update 23 (version 2023.0.23) and ColdFusion 2025 Update 12 (version 2025.0.12). Organizations should apply these updates promptly via the Adobe security bulletin APSB26-90. As interim mitigations, administrators should restrict network access to ColdFusion services, implement intrusion detection rules targeting heap overflow exploitation patterns, and monitor ColdFusion instances for anomalous outbound connections or unexpected process spawning (Adobe Advisory, CIS Advisory).

The Center for Internet Security (CIS) issued an advisory noting that multiple Adobe vulnerabilities disclosed in August 2026, including CVE-2026-48440, could allow for arbitrary code execution, recommending prompt patching (CIS Advisory). Security news outlets including CyberSecurityNews and GBHackers covered the disclosure as part of Adobe's August 2026 patch cycle, highlighting the ColdFusion RCE risk (CyberSecurityNews, GBHackers). Community sentiment reflects moderate concern given ColdFusion's history of targeted exploitation, though the high attack complexity somewhat tempers urgency compared to simpler RCE vulnerabilities.