CVE-2026-5303 in Axis Communications
Summary
by MITRE • 08/11/2026
The ACAP framework contains a Time-of-Check to Time-of-Use (TOCTOU) race condition, which could potentially lead to privilege escalation. This vulnerability can only be exploited if the Axis device is configured to allow the installation of unsigned ACAP applications, and if an attacker convinces the victim to install a malicious ACAP application.
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Analysis
by VulDB Data Team • 08/11/2026
The ACAP framework vulnerability represents a critical time-of-check to time-of-use race condition that fundamentally compromises system security through improper access control validation. This flaw exists within the application installation process where the system performs initial permission checks at the time of verification but fails to maintain those security contexts during subsequent operations. The vulnerability resides in the framework's handling of unsigned application installations, creating a temporal window where security assertions can be bypassed between the moment of validation and actual execution. According to CWE-367, this constitutes a dangerous race condition that allows attackers to manipulate system state between verification and utilization phases. The flaw specifically impacts Axis network devices that permit unsigned ACAP application deployment, establishing a pathway for malicious actors to exploit trust relationships within the device's security architecture.
The technical exploitation of this vulnerability requires precise timing and specific preconditions that limit its attack surface but do not eliminate its severity. Attackers must first gain access to a target Axis device configured with unsigned application installation enabled, which typically represents a misconfiguration rather than an inherent flaw in the device's core security model. The malicious payload must then be carefully crafted to take advantage of the race condition during the installation process, where the system transitions from verification state to operational execution. This temporal vulnerability window allows for privilege escalation attempts that could enable attackers to execute code with elevated permissions beyond what would normally be permitted for unsigned applications. The attack vector relies heavily on social engineering elements to convince victims to install malicious payloads, making it particularly challenging to defend against through traditional technical controls alone.
The operational impact of this vulnerability extends beyond simple privilege escalation to potentially compromise entire device infrastructures and network security postures. When successfully exploited, the vulnerability allows attackers to bypass normal access controls that would typically prevent installation or execution of unauthorized applications. This could lead to persistent backdoor access, data exfiltration capabilities, or complete device compromise that affects not only the individual Axis device but potentially the broader network ecosystem it connects to. The risk is particularly elevated in industrial environments where Axis devices often serve as critical infrastructure components for surveillance and monitoring systems. From an ATT&CK framework perspective, this vulnerability maps to privilege escalation techniques and potentially to initial access vectors through application installation methods, creating a multi-stage attack pathway that could be leveraged for advanced persistent threats.
Mitigation strategies must address both the immediate configuration issues and implement broader system hardening measures to prevent exploitation of this race condition. Organizations should immediately disable unsigned application installation capabilities on all Axis devices unless absolutely required for legitimate operational purposes, as this configuration represents the primary attack entry point. Network segmentation and monitoring controls should be implemented to detect unusual application installation patterns or attempts to modify system configurations. Regular security audits should verify that devices are not configured with unnecessary unsigned application permissions, while incident response procedures must include specific checks for unauthorized ACAP installations. Additionally, device firmware updates from Axis should be prioritized to address the underlying race condition in the framework implementation, as this represents a fundamental software flaw rather than a configuration issue that can be fully mitigated through operational controls alone.