CVE-2026-61501 in HFS
Summary
by MITRE • 07/13/2026
Rejetto HFS 3.0.0 through 3.2.0 renders log entries in the administration panel as HTML without sanitization. A remote unauthenticated attacker can submit a failed login with a crafted username that is written to the error log and executes JavaScript in an administrator's browser when the logs are viewed, allowing the attacker to create accounts or execute code on the server with the administrator's privileges.
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Analysis
by VulDB Data Team • 07/13/2026
This vulnerability exists in Rejetto HFS versions 3.0.0 through 3.2.0 where the web application fails to properly sanitize log entries before rendering them in the administration panel. The flaw represents a classic cross-site scripting vulnerability that operates through the application's logging mechanism rather than direct input validation. When an attacker submits a failed login attempt with a specially crafted username containing malicious javascript code, this input is written to the error log without proper HTML sanitization. The vulnerability is particularly dangerous because it does not require authentication to exploit, making it accessible to any remote attacker who can submit login attempts against the system. The attack vector leverages the administrative panel's display of log entries, where an administrator viewing the logs would inadvertently execute the malicious javascript code within their browser context, creating a persistent cross-site scripting scenario.
The technical implementation of this vulnerability aligns with CWE-79 - Cross-site Scripting and follows patterns similar to those documented in the ATT&CK framework under T1203 - Exploitation for Client Execution. The flaw exploits the trust relationship between the administrator's browser and the application's internal logging system, where legitimate administrative interface elements become attack vectors for code execution. The vulnerability is particularly severe because it operates at the administrative level, allowing attackers to execute arbitrary commands with full administrative privileges when the logs are viewed. This creates a persistent threat model where even after an initial attack, the malicious payload continues to execute whenever administrators review the logs, potentially enabling account creation, file manipulation, or other malicious activities that require elevated permissions.
The operational impact of this vulnerability extends beyond simple XSS exploitation and represents a significant risk to server integrity and security posture. An attacker can leverage this vulnerability to establish persistent access to the system by creating new administrative accounts or executing commands through the compromised administrative session. The vulnerability also enables reconnaissance activities where attackers can gather information about system configuration, user accounts, and other sensitive data through the execution environment provided by the administrator's browser session. Additionally, because the exploitation occurs through legitimate administrative interface elements, detection becomes more challenging as the malicious activity appears to originate from normal administrative log viewing operations rather than suspicious network traffic patterns.
Mitigation strategies for this vulnerability should focus on implementing proper input sanitization and output encoding mechanisms within the application logging system. The most effective approach involves ensuring that all log entries are properly escaped or sanitized before being rendered in any HTML context, particularly within administrative interfaces. Organizations should implement strict content security policies that prevent execution of inline javascript within administrative panels and consider implementing automatic log rotation with proper access controls to limit exposure windows. Network-level protections such as web application firewalls can provide additional defense-in-depth measures, though the primary remediation must occur at the application level through proper input validation and output encoding practices. Regular security audits should verify that all logging mechanisms properly handle potentially malicious input and that administrative interfaces maintain proper isolation between user-provided data and rendered content to prevent similar vulnerabilities from emerging in other components of the system.