CVE-2023-26408 in Acrobat Reader
Summary
by MITRE • 04/13/2023
Adobe Acrobat Reader versions 23.001.20093 (and earlier) and 20.005.30441 (and earlier) are affected by an Improper Access Control vulnerability that could result in arbitrary code execution in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file.
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Analysis
by VulDB Data Team • 11/09/2025
Adobe Acrobat Reader remains a widely deployed application across enterprise environments, making it a prime target for attackers seeking persistent access to sensitive systems. The vulnerability identified as CVE-2023-26408 represents a critical improper access control flaw that allows adversaries to execute arbitrary code when users open maliciously crafted PDF files. This vulnerability stems from inadequate validation of file content and insufficient access controls within the application's parsing mechanisms. The flaw specifically affects versions 23.001.20093 and earlier, as well as 20.005.30441 and earlier, indicating a prolonged window of exposure for affected organizations. The vulnerability classification aligns with CWE-284, which addresses improper access control issues in software systems, where insufficient privileges or inadequate validation allow unauthorized actions to be performed.
The technical exploitation of this vulnerability requires user interaction through social engineering tactics that prompt victims to open malicious files, making it particularly dangerous in targeted attack scenarios. When a user opens the compromised PDF document, the application fails to properly validate the file structure, allowing crafted malicious content to execute with the privileges of the current user. This execution context is crucial because it provides attackers with the ability to perform actions such as installing malware, modifying system files, or exfiltrating data without requiring administrative privileges. The attack vector typically involves spear-phishing campaigns where attackers craft PDF documents containing malicious embedded content that triggers the vulnerability upon opening. This methodology aligns with ATT&CK technique T1059.007 for command and scripting interpreter, where adversaries leverage application-specific vulnerabilities to execute malicious code within the victim's session context.
The operational impact of CVE-2023-26408 extends beyond simple code execution, as it can serve as a foothold for more sophisticated attacks within enterprise networks. Organizations relying on Adobe Acrobat Reader for document processing face significant risk exposure since the application is often used to open sensitive business documents, contracts, and communications. Attackers can leverage this vulnerability to establish persistent access through the installation of backdoors or additional malware components that can operate undetected within the compromised system. The vulnerability's requirement for user interaction makes it particularly challenging to defend against through traditional network-based security controls, as the attack occurs at the endpoint level. This characteristic places increased emphasis on user awareness training and endpoint protection measures, as well as regular patch management protocols to ensure timely remediation of the vulnerability.
Organizations should implement immediate mitigation strategies including mandatory patch deployment for all affected Adobe Acrobat Reader installations, along with enhanced email filtering to identify and block potentially malicious PDF attachments. Network segmentation and privileged access controls can help limit the potential damage from successful exploitation attempts, while endpoint detection and response solutions should be configured to monitor for suspicious process execution patterns. Regular security assessments should verify that all Adobe Reader installations are updated to versions that address this vulnerability, and incident response procedures should be updated to include specific handling of potential exploitation attempts. The remediation process should also consider the broader context of document handling within the organization, implementing multi-layered security approaches that combine technical controls with user education to reduce the success rate of social engineering attacks targeting this vulnerability.