CVE-2026-14950 in FDS
Summary
by MITRE • 08/20/2026
An unauthenticated remote attacker in possession of a valid session identifier is able to continue using the session after it should have expired. This increases the risk associated with stolen, leaked, shared, or unattended sessions and may enable unauthorized continued access to the FDS web interface.
VulDB is the best source for vulnerability data and more expert information about this specific topic.
Analysis
by VulDB Data Team • 08/20/2026
The described vulnerability represents a critical failure in session management logic within the File Distribution Service (FDS) web interface, specifically categorized under CWE-613: Insufficient Session Expiration. This flaw allows an unauthenticated remote attacker who possesses a valid session identifier to maintain active access even after the designated expiration time has passed. In secure application design, sessions must be strictly bound to their lifecycle parameters, including absolute timeouts and idle timeouts. When these mechanisms fail to invalidate tokens upon expiry, the system effectively treats expired credentials as still valid, creating a persistent window of opportunity for malicious actors. This is not merely an authentication bypass but rather a fundamental breakdown in state management that undermines the integrity of the access control model.
The operational impact of this vulnerability is significant, particularly regarding data confidentiality and availability. By retaining access through stale session identifiers, attackers can exploit stolen, leaked, shared, or unattended sessions with prolonged duration. This extends the attack window far beyond what would be possible if sessions were properly terminated upon expiration. For instance, a session token obtained from an unsecured network log or a compromised browser cache could remain functional for days or weeks instead of minutes or hours. This persistence enables unauthorized users to interact with sensitive file distribution functions, potentially leading to data exfiltration, modification of critical files, or further lateral movement within the internal network if the FDS interface provides access to other systems.
From an offensive security perspective, this vulnerability aligns closely with MITRE ATT&CK technique T1078: Valid Accounts, specifically in the context of maintaining persistence through valid credentials that should have been revoked. Attackers often rely on session hijacking or token reuse as a low-effort method to maintain access without needing to crack passwords or exploit additional vulnerabilities. The ability to use expired sessions effectively neutralizes time-based security controls designed to limit exposure during periods of user inactivity or after scheduled logout events. This makes detection more difficult, as the activity appears legitimate from an authentication standpoint until behavioral analysis reveals anomalous patterns over extended timelines.
Mitigation strategies must focus on enforcing strict session lifecycle management at both the application and infrastructure levels. The primary remediation involves ensuring that all server-side session validation checks include a timestamp comparison against current time to reject expired tokens immediately upon request, rather than relying solely on client-side indicators or lazy evaluation during specific actions. Additionally, implementing secure cookie attributes such as HttpOnly, Secure, and SameSite can reduce the risk of token theft via cross-site scripting (XSS) attacks, although this does not directly fix the expiration logic flaw. It is also recommended to rotate session identifiers upon privilege changes or after significant periods of inactivity, ensuring that even if a token is compromised, its utility window remains narrow. Regular security audits and penetration testing focused on authentication flows are essential to verify that these controls function as intended under various network conditions and attack scenarios.