CVE-2026-93534 in Scotty
Summary
by MITRE • 09/18/2026
A vulnerability was identified in spatie Scotty up to 1.4.2. Affected is the function SelfUpdater::update of the file app/Updater/SelfUpdater.php of the component Self Update Handler. Such manipulation leads to download of code without integrity check. It is possible to launch the attack remotely. Upgrading to version 1.4.3 is able to address this issue. The name of the patch is 4b4e11bfc98e3a2159bb2b3d9b040293fcc44744. It is advisable to upgrade the affected component.
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Analysis
by VulDB Data Team • 09/18/2026
The vulnerability identified in spatie Scotty versions up to 1.4.2 represents a critical security flaw within the Self Update Handler component, specifically located in the SelfUpdater::update function found in app/Updater/SelfUpdater.php. This issue stems from an improper implementation of integrity verification mechanisms during the software update process. When the application initiates an update sequence, it retrieves new code artifacts but fails to perform a cryptographic hash check or signature validation against known trusted sources before executing them. This absence of integrity checks means that the system cannot distinguish between legitimate updates provided by the official repository and malicious payloads injected into the transmission channel or hosted on compromised mirrors.
From a technical perspective, this flaw allows for remote code execution under specific conditions where an attacker can manipulate the update source or intercept the network traffic to substitute the expected binary with a malicious alternative. Since the application proceeds to download and execute the unverified code without validating its authenticity, any arbitrary commands embedded within that payload will run with the privileges of the user account executing Scotty. This effectively bypasses standard security controls designed to prevent unauthorized software installation or modification, turning a routine maintenance feature into a direct vector for system compromise. The vulnerability is classified as CWE-829: Inclusion of Functionality from Untrusted Control Sector because it involves trusting external input without sufficient validation, and aligns with MITRE ATT&CK technique T1105: Ingress Tool Transfer when the attacker uses this flaw to deploy additional malware onto the target system.
The operational impact of this vulnerability is severe due to its remote exploitability. An adversary does not need physical access or prior authentication within the application itself if they can influence the update source URL or perform a man-in-the-middle attack on an unencrypted connection. By exploiting this flaw, attackers could gain full control over the affected server environment, leading to data exfiltration, lateral movement across internal networks, and persistent backdoor installation. The lack of integrity verification undermines the fundamental trust model required for automated update systems, making it possible to escalate privileges or disrupt service availability by injecting destructive code that corrupts system files or initiates denial-of-service conditions through resource exhaustion.
To mitigate this risk, immediate action is required to upgrade spatie Scotty to version 1.4.3 or later, which incorporates the patch identified as commit 4b4e11bfc98e3a2159bb2b3d9b040293fcc44744. This update restores proper integrity verification procedures, ensuring that downloaded updates are validated against trusted cryptographic signatures before execution. In addition to upgrading the software component, administrators should enforce HTTPS for all communication channels related to update retrieval to prevent network-level interception and tampering. Implementing strict firewall rules to restrict outbound connections only to verified official repositories further reduces the attack surface. Regular monitoring of application logs for unexpected download activities or unauthorized process executions can also aid in early detection of exploitation attempts while maintaining a robust patch management lifecycle ensures long-term resilience against similar vulnerabilities.