CVE-2026-15389
HighCVSS 8.7Exploitation Probability (EPSS)
Low risk19th percentile - higher than 19% of all known CVEs
Summary
A vulnerability in the Sesame Time web application and its REST v3 API allows session impersonation due to insufficient access control. The system uses the session identifier (USID) as the sole validation mechanism without verifying its ownership, and does not revoke old sessions upon new logins. An attacker with a valid USID can impersonate a victim and access confidential data including emails, user IDs, roles, and corporate information.
Risk Assessment
The organization faces risks of unauthorized access to sensitive user data, identity theft, and potential leakage of corporate information, leading to privacy breaches and regulatory non-compliance.
Recommendation
Immediately implement verification that the session identifier (USID) belongs to the authenticated user, and enforce revocation of previous sessions upon each new login.
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Original NVD description (English source)
A vulnerability relating to insufficient access control has been identified in the session management of the Sesame Time web application and its REST v3 API. The flaw lies in the fact that the system uses the session identifier (USID) as the sole validation mechanism, without verifying whether that identifier legitimately belongs to the user making the request. As a result, an attacker who obtains a valid USID can impersonate a victim’s session and access their confidential information, including emails, user IDs, roles and corporate data. This vulnerability is exacerbated by poor session lifecycle management: new logins generate additional USIDs without revoking the previous ones, allowing multiple active sessions to coexist and thereby expanding the attack surface.