CVE-2026-61503
MediumCVSS 5.3Exploitation Probability (EPSS)
Low risk27th percentile - higher than 27% of all known CVEs
Summary
Rejetto HFS versions 3.0.0 through 3.2.0 return observably different responses from its login endpoint depending on whether the submitted username exists. A remote unauthenticated attacker can use this to confirm valid account names, including the default admin account.
Risk Assessment
Disclosure of valid usernames facilitates password-guessing and session-forgery attacks, potentially leading to unauthorized access to the HFS system and managed files.
Recommendation
Immediately upgrade Rejetto HFS to version 3.2.1 or later, which fixes this vulnerability. If upgrading is not possible, consider restricting access to the login interface to trusted IP addresses only.
Other vulnerabilities in Rejetto HFS
See all- CVE-2026-61500Critical
The vulnerability in Rejetto HFS versions 3.0.0 through 3.2.0 derives the session-cookie signing key from the non-cryptographic Math.random() generator and discloses its outputs to unauthenticated clients during login. A remote attacker can collect a few login responses, reconstruct the generator's state, recover the signing key, and forge a valid administrator session cookie, leading to full administrative access and remote code execution via the server_code configuration feature.
- CVE-2026-61505Medium
A vulnerability in Rejetto HFS versions 3.0.0 through 3.2.0 allows a remote unauthenticated attacker to read JSON files outside shared folders by manipulating the 'lang' query parameter. Exploitation is limited to files with a narrow naming and format pattern, reducing practical impact.
- CVE-2026-61504Medium
A vulnerability in Rejetto HFS versions 3.0.0 through 3.2.0 allows XSS attacks due to improper escaping of file names in the basic web listing. An attacker with upload permissions or an anonymous user can upload a file with a malicious name that executes a script in the victim's browser.
- CVE-2026-61502Medium
A vulnerability in Rejetto HFS versions 3.0.0 through 3.2.0 allows state-changing API requests via the GET method, which is exempt from anti-CSRF header checks. A remote attacker can perform administrative actions including account creation and configuration changes leading to code execution.
- CVE-2026-61501Medium
A vulnerability in Rejetto HFS versions 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.
Original NVD description (English source)
Rejetto HFS 3.0.0 through 3.2.0 returns observably different responses from its login endpoint depending on whether the submitted username exists. A remote unauthenticated attacker can use this to confirm valid account names, including the default admin account, facilitating password-guessing and session-forgery attacks.