CVE-2026-21283 is a heap-based buffer overflow vulnerability (CWE-122) affecting Adobe Bridge versions 15.1.2, 16.0, and earlier. The vulnerability arises from improper handling of data in heap memory, allowing an attacker to overwrite memory buffers beyond their allocated size. This can lead to arbitrary code execution within the context of the current user. Exploitation requires the victim to open a maliciously crafted file, which triggers the overflow. The attack vector is local (AV:L), meaning the attacker must convince the user to open the file, but no privileges or authentication are required (PR:N). The vulnerability impacts confidentiality, integrity, and availability (C:H/I:H/A:H) since arbitrary code execution can lead to data theft, system compromise, or denial of service. The vulnerability is rated high severity with a CVSS 3.1 score of 7.8. No patches or known exploits have been reported at the time of publication, but the risk remains significant due to the widespread use of Adobe Bridge in creative workflows. The vulnerability could be leveraged in targeted attacks or phishing campaigns where malicious files are distributed to users. Given the nature of the vulnerability, attackers could execute payloads that persist or move laterally within networks if user privileges allow.

For European organizations, this vulnerability poses a significant risk, particularly for those in media, advertising, publishing, and creative industries that rely heavily on Adobe Bridge for asset management. Successful exploitation could lead to unauthorized access to sensitive intellectual property, disruption of creative workflows, and potential lateral movement within corporate networks. The compromise of user accounts could also facilitate further attacks, including ransomware or data exfiltration. Since exploitation requires user interaction, phishing or social engineering campaigns could be effective attack vectors. The impact extends to operational continuity, data confidentiality, and organizational reputation. Organizations with remote or hybrid workforces may face increased risk due to less controlled environments and potential exposure to malicious files. The absence of patches increases the urgency for interim mitigations to reduce exposure.

1. Restrict the opening of files from untrusted or unknown sources, especially those received via email or downloaded from the internet. 2. Implement robust email filtering and phishing detection to reduce the likelihood of malicious file delivery. 3. Employ application whitelisting to limit execution of unauthorized code and restrict Adobe Bridge usage to trusted users. 4. Monitor endpoint behavior for unusual activities indicative of exploitation attempts, such as unexpected process launches or memory anomalies. 5. Educate users about the risks of opening unsolicited or suspicious files and encourage verification before opening. 6. Maintain up-to-date backups of critical data to enable recovery in case of compromise. 7. Prepare to deploy patches promptly once Adobe releases updates addressing this vulnerability. 8. Use endpoint detection and response (EDR) solutions to detect and respond to exploitation attempts in real time. 9. Consider network segmentation to limit lateral movement if a user system is compromised. 10. Review and enforce least privilege principles to minimize the impact of code execution under user context.