CVE-2026-55466 in snipe-it
Summary
by MITRE • 07/10/2026
Snipe-IT is an IT asset/license management system. Prior to 8.6.2, UploadFileRequest sanitizes SVG content only when PHP finfo reports image/svg+xml and UploadedFilesController serves attachments inline without using StorageHelper::allowSafeInline(), allowing a low-privilege user to upload active XHTML or XML content that is later served same-origin and executes JavaScript in a viewer’s browser. This issue is fixed in version 8.6.2.
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Analysis
by VulDB Data Team • 07/10/2026
The vulnerability in Snipe-IT versions prior to 8.6.2 represents a critical server-side request forgery and cross-site scripting risk that stems from improper handling of file uploads, specifically targeting SVG content within the IT asset management system. This flaw occurs during the file validation process where the UploadFileRequest class only sanitizes SVG files when PHP's finfo extension correctly identifies them as image/svg+xml MIME types. However, when the MIME type detection fails or is bypassed, maliciously crafted XML content can be uploaded and subsequently served to users without proper security restrictions.
The technical implementation of this vulnerability exploits a weakness in the file validation logic where the system relies on MIME type detection from finfo to determine whether sanitization is required, but does not enforce consistent security measures for all uploaded files regardless of their detected type. When the UploadedFilesController serves attachments inline to users, it fails to utilize the StorageHelper::allowSafeInline() method that would normally prevent execution of potentially dangerous content types. This creates a scenario where an attacker can upload active XHTML or XML files containing JavaScript code that executes in the context of the victim's browser when viewed through the application's inline viewer functionality.
The operational impact of this vulnerability is significant as it allows low-privilege users to escalate their access level and execute arbitrary JavaScript code against other users within the same origin. This creates a persistent threat vector where malicious actors can perform actions such as stealing session cookies, redirecting users to phishing sites, or executing data exfiltration attacks against other authenticated users who view the compromised files. The vulnerability is particularly dangerous in enterprise environments where IT asset management systems contain sensitive organizational data and user credentials.
This issue aligns with CWE-434 which addresses "Unrestricted Upload of File with Dangerous Type" and represents a specific instance of improper input validation that enables code execution through file upload mechanisms. The vulnerability also maps to ATT&CK technique T1566.002 which covers "Phishing: Spearphishing Attachments" as the malicious files can be used to deliver payloads that execute in user browsers. Additionally, this represents a classic case of insufficient input sanitization and improper access control enforcement within file handling components. Organizations should immediately upgrade to Snipe-IT version 8.6.2 or later where the fix properly enforces consistent security measures for all uploaded files regardless of MIME type detection results, implements proper inline content restrictions, and ensures that SVG sanitization occurs consistently across all file upload pathways.
The remediation approach requires comprehensive validation of all file uploads through multiple verification layers including MIME type checking, content inspection, and consistent application of security policies regardless of initial detection results. Security controls should enforce strict file type validation at multiple points in the upload process and ensure that all served content undergoes appropriate sandboxing or security filtering mechanisms to prevent execution of potentially malicious code within the browser context.