An out‑of‑bounds write in Adobe InCopy allows an attacker to achieve arbitrary code execution in the context of the current user. The flaw arises when a malicious file is opened, leading the application to write data beyond the bounds of a buffer and corrupt memory. This results in loss of confidentiality, integrity, and availability for the user who opens the file. The weakness is classified as CWE‑787.

Adobe InCopy versions 20.5.2, 21.2, and all earlier releases are vulnerable. Users running these versions on any platform are at risk if they open files created by an attacker or that have been tampered with.

The vulnerability carries a high CVSS score of 7.8, indicating significant potential impact. Exploit probability is not quantified by EPSS, but the requirement of user interaction to open a malicious file limits the attack surface to situations where phishing or social engineering can be employed. The vulnerability is not currently listed in the CISA Known Exploited Vulnerabilities catalog, and no public exploit has been reported, suggesting moderate likelihood of exploitation in the near term. Nonetheless, the high severity warrants immediate attention.