CVE-2026-21347 is an integer overflow or wraparound vulnerability (CWE-190) identified in Adobe Bridge versions 15.1.3, 16.0.1, and earlier. This vulnerability arises when the software improperly handles integer values, leading to overflow conditions that can corrupt memory or cause unexpected behavior. An attacker can craft a malicious file that, when opened by a user in Adobe Bridge, triggers this overflow, enabling arbitrary code execution within the context of the current user. The vulnerability requires user interaction, specifically opening a malicious file, but does not require any prior authentication or elevated privileges. The CVSS v3.1 base score is 7.8, reflecting high impact on confidentiality, integrity, and availability, with low attack complexity and no privileges required. Although no known exploits have been reported in the wild yet, the vulnerability poses a significant risk due to the widespread use of Adobe Bridge in creative and media workflows. The lack of available patches at the time of publication increases the urgency for organizations to implement interim mitigations. The vulnerability could allow attackers to execute arbitrary code, potentially leading to data theft, system compromise, or disruption of services.

For European organizations, this vulnerability could lead to significant security breaches, especially in sectors relying heavily on Adobe Bridge such as media, advertising, design, and publishing. Successful exploitation could compromise sensitive intellectual property, client data, and internal communications. The arbitrary code execution capability allows attackers to install malware, move laterally within networks, or exfiltrate data. Given the user interaction requirement, phishing or social engineering campaigns could be used to deliver malicious files. The impact on confidentiality, integrity, and availability is high, potentially resulting in operational disruption and reputational damage. Organizations with large creative teams or those that share files frequently are at elevated risk. Additionally, the absence of patches means that the window of exposure remains open until Adobe releases an update, increasing the likelihood of exploitation attempts.

Organizations should immediately implement strict controls on file handling within Adobe Bridge, including disabling the automatic opening of files from untrusted sources. User awareness training should emphasize the risks of opening unsolicited or suspicious files, particularly those received via email or external media. Employ application whitelisting and sandboxing techniques to limit the execution context of Adobe Bridge. Network segmentation can reduce lateral movement if a compromise occurs. Monitoring for unusual process behavior or file access patterns related to Adobe Bridge can aid in early detection. Until official patches are released, consider restricting Adobe Bridge usage to essential personnel only or replacing it with alternative software where feasible. Regularly check Adobe’s security advisories for updates and apply patches promptly once available. Employ endpoint protection solutions capable of detecting exploit attempts targeting this vulnerability.