CVE-2025-54213 is a high-severity out-of-bounds write vulnerability (CWE-787) affecting Adobe InDesign Desktop versions 20.4, 19.5.4, and earlier. This vulnerability arises when the software improperly handles memory boundaries during processing of certain input data, leading to an out-of-bounds write condition. Such a flaw can corrupt memory, potentially allowing an attacker to execute arbitrary code within the context of the current user. Exploitation requires user interaction, specifically that the victim opens a crafted malicious InDesign file. The vulnerability does not require prior authentication or elevated privileges, but the attacker must convince the user to open the malicious file, which could be delivered via phishing or other social engineering techniques. The CVSS v3.1 base score is 7.8, reflecting high impact on confidentiality, integrity, and availability, with low attack complexity but requiring user interaction. No known exploits are currently reported in the wild, and no patches or updates have been linked yet. Given Adobe InDesign’s widespread use in creative industries for desktop publishing, this vulnerability poses a significant risk to users who handle untrusted or external InDesign files.

For European organizations, especially those in media, publishing, advertising, and design sectors, this vulnerability could lead to serious consequences. Successful exploitation could result in arbitrary code execution, enabling attackers to steal sensitive intellectual property, manipulate or destroy design files, or establish persistence within corporate networks. The compromise of user accounts could also serve as a foothold for lateral movement or further attacks. Since Adobe InDesign is often used on workstations with access to critical business data, the impact extends beyond individual users to organizational confidentiality and operational continuity. Additionally, the requirement for user interaction means phishing campaigns targeting European employees could be an effective attack vector, potentially leading to data breaches or ransomware deployment. The lack of a patch at the time of disclosure increases the window of exposure, emphasizing the need for immediate mitigations.

European organizations should implement targeted mitigations beyond generic advice. First, restrict the opening of InDesign files from untrusted or unknown sources, enforcing strict email filtering and attachment scanning policies. Employ endpoint protection solutions capable of detecting anomalous behavior related to memory corruption exploits. Conduct user awareness training focused on recognizing phishing attempts and the risks of opening unsolicited files. Where possible, isolate InDesign usage to dedicated workstations with limited network privileges and no administrative rights to reduce potential damage. Monitor for unusual process behavior or crashes related to InDesign that could indicate exploitation attempts. Organizations should also engage with Adobe’s security advisories to promptly apply patches once released. In the interim, consider application whitelisting or sandboxing techniques to contain potential exploitation. Finally, maintain robust backup and incident response plans to recover quickly if compromise occurs.