CVE-2026-61502 in HFS
Summary
by MITRE • 07/13/2026
Rejetto HFS 3.0.0 through 3.2.0 accepts state-changing API requests via the GET method and exempts GET requests from its anti-CSRF header check. A remote attacker can perform administrative actions including account creation and configuration changes leading to code execution - by causing a logged-in administrator's browser to navigate to a crafted URL, or without any credentials against default installations when the attack originates from the server's own machine.
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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 application incorrectly handles state-changing API requests through the GET method while simultaneously bypassing anti-CSRF protection mechanisms. The flaw stems from improper input validation and request handling where the system treats GET requests as safe for state modifications without proper authentication verification. This design oversight creates a critical security gap that allows remote attackers to execute administrative actions against vulnerable installations. The vulnerability manifests when attackers craft malicious URLs that trigger administrative functions through GET parameters, exploiting the absence of CSRF token validation for these specific request types.
The technical implementation of this flaw involves the application's API endpoint processing logic where GET requests are not properly filtered or validated before executing sensitive operations. According to CWE-352, this represents a Cross-Site Request Forgery vulnerability where the web application fails to verify the origin of requests. The attacker can leverage this weakness by constructing URLs that perform administrative tasks such as account creation, configuration modifications, and potentially code execution. When an authenticated administrator visits a malicious page containing a crafted GET request, their browser automatically executes the command with their privileges due to the missing CSRF protection. This attack vector is particularly dangerous because it operates without requiring authentication credentials from the attacker's perspective.
The operational impact of this vulnerability extends beyond simple privilege escalation to full system compromise in certain scenarios. When the application runs on default configurations where administrative access is available locally, attackers can exploit the vulnerability from the server itself without external network access. This creates a potential for local privilege escalation and remote code execution depending on the server configuration and installed modules. The vulnerability affects organizations using Rejetto HFS for file sharing and web serving applications, particularly those that do not properly restrict administrative access or implement additional security controls. According to ATT&CK framework technique T1059.007, this vulnerability enables adversaries to execute code through web-based attack vectors.
Mitigation strategies should focus on immediate patching of affected versions to address the core implementation flaw. Organizations must ensure that state-changing API requests are properly validated regardless of HTTP method and that CSRF protection mechanisms apply uniformly across all request types. Implementing proper request filtering, authentication verification for all administrative operations, and enforcing CSRF tokens for every sensitive action provides adequate defense. Network segmentation and access controls should limit exposure of vulnerable HFS installations to untrusted networks. Regular security assessments of web applications and monitoring for unauthorized administrative activities remain crucial defensive measures against similar vulnerabilities in other software systems.