CVE-2026-123282 in Datalore
Summary
by MITRE • 11/06/2026
In JetBrains Datalore before 2026.4 missing expiration validation of account tokens allowed a new authenticated session
Be aware that VulDB is the high quality source for vulnerability data.
Analysis
by VulDB Data Team • 11/06/2026
The vulnerability identified in JetBrains Datalore prior to version 2026.4 represents a critical authentication bypass flaw rooted in the improper handling of token lifecycle management. Specifically, the application failed to enforce expiration constraints on certain types of account tokens used for establishing user sessions. In modern web and cloud-based development environments like Datalore, which provides an interactive coding environment based on Jupyter notebooks, session security relies heavily on the timely invalidation of access credentials after a defined period or upon specific events such as logout or password changes. When this validation logic is absent or flawed, tokens that should have been rendered obsolete remain valid and functional within the system's authentication mechanism. This deficiency allows an attacker who has obtained a previously issued token to reuse it indefinitely, effectively maintaining persistent authenticated access without needing to re-authenticate with current credentials.
From a technical perspective, this flaw aligns closely with CWE-613, which describes insufficient session expiration. The operational impact of such a vulnerability is severe in the context of cloud-based development tools where sensitive code repositories, proprietary algorithms, and personal data are processed. An adversary who gains access to these long-lived tokens can impersonate legitimate users, potentially leading to unauthorized modification or exfiltration of source code, injection of malicious dependencies into projects, or lateral movement within connected infrastructure if the user has broader permissions. Furthermore, because Datalore integrates with various version control systems and cloud providers, compromised sessions could serve as a pivot point for more extensive attacks against an organization's software supply chain. The lack of expiration validation undermines the principle of least privilege by allowing stale credentials to retain full access rights indefinitely, increasing the window of opportunity for exploitation significantly compared to environments where tokens are short-lived or strictly rotated.
This type of authentication failure is also relevant to MITRE ATT&CK technique T1078, specifically Valid Accounts, as it involves the misuse of legitimate credentials that have not been properly revoked due to system logic errors rather than direct credential theft through phishing or brute force. The persistence afforded by non-expiring tokens makes detection and remediation more challenging for security operations teams, as traditional monitoring might not flag activity from a token that appears technically valid according to the flawed validation rules. To mitigate this risk, it is imperative that organizations using affected versions of JetBrains Datalore upgrade immediately to version 2026.4 or later where the expiration logic has been corrected. Additionally, administrators should enforce strict session timeout policies and consider implementing multi-factor authentication to add a layer of defense-in-depth. Regular auditing of active sessions and revocation of unused tokens can further reduce the attack surface associated with stale credentials. Developers must also ensure that their CI/CD pipelines and automated scripts using API keys or personal access tokens are configured with appropriate expiration dates, adhering to industry best practices for credential management as outlined in standards such as NIST SP 800-63B regarding digital identity guidelines.