CVE-2025-47097 is a high-severity integer underflow vulnerability (CWE-191) affecting Adobe InCopy versions 20.3, 19.5.3, and earlier. The flaw arises from an integer underflow condition, where arithmetic operations on integer values wrap around unexpectedly, potentially leading to memory corruption. This vulnerability can be exploited when a user opens a specially crafted malicious InCopy file, enabling an attacker to execute arbitrary code within the context of the current user. The vulnerability requires user interaction (opening a malicious file) and does not require prior authentication or elevated privileges. The CVSS 3.1 base score of 7.8 reflects the high impact on confidentiality, integrity, and availability, with low attack complexity and no privileges required. Although no known exploits are currently reported in the wild, the potential for arbitrary code execution makes this a critical risk for users of affected Adobe InCopy versions. The lack of available patches at the time of publication increases the urgency for mitigation and risk management.

For European organizations, the exploitation of this vulnerability could lead to significant risks including unauthorized data access, data manipulation, and disruption of business operations. Adobe InCopy is widely used in publishing, media, and creative industries, sectors that are prominent in Europe, especially in countries with strong media and publishing markets such as Germany, France, and the United Kingdom. Successful exploitation could result in intellectual property theft, leakage of sensitive editorial content, and potential ransomware or malware deployment through the compromised user context. The requirement for user interaction means that targeted phishing or social engineering campaigns could be effective attack vectors. Given the high confidentiality and integrity impact, organizations handling sensitive or proprietary content are particularly vulnerable. The absence of known exploits currently provides a window for proactive defense, but the risk of future exploitation remains significant.

European organizations should implement specific mitigations beyond generic advice: 1) Immediately audit and inventory all Adobe InCopy installations to identify affected versions (20.3, 19.5.3, and earlier). 2) Restrict the opening of InCopy files from untrusted or external sources, employing file-blocking policies or sandboxing mechanisms. 3) Educate users, especially editorial and creative teams, about the risks of opening unsolicited or suspicious InCopy files and implement phishing awareness training focused on this vector. 4) Employ endpoint detection and response (EDR) tools to monitor for anomalous behavior indicative of exploitation attempts, such as unexpected code execution or memory corruption patterns. 5) Apply application whitelisting to prevent unauthorized execution of code spawned by InCopy processes. 6) Monitor Adobe’s security advisories closely for patches or updates and plan rapid deployment once available. 7) Consider network segmentation to isolate systems running InCopy to limit lateral movement in case of compromise. 8) Use Data Loss Prevention (DLP) solutions to detect and prevent exfiltration of sensitive content potentially accessed through exploitation.