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**Name of the Vulnerable Software and Affected Versions** Uptime Kuma versions prior to 1.23.9 **Description** The issue allows unauthorized access to user accounts, compromising the security of sensitive information. When a user changes their login password in Uptime Kuma, a previously logged-in user retains access without being logged out. This behavior persists consistently, even after system restarts or browser restarts. To mitigate the risks associated with this issue, the maintainers made the server emit a `refresh` event and then disconnecting all clients except the one initiating the password change. **Recommendations** Update Uptime Kuma to version 1.23.9 or later. As a temporary workaround, consider restricting access to sensitive information until the update is applied.

**Name of the Vulnerable Software and Affected Versions** Uptime Kuma versions prior to 1.23.3 **Description** The issue allows attackers with access to a user's device to gain persistent account access due to missing verification of Session Tokens after password changes and/or elapsed inactivity periods. This is caused by design flaws in the JWT tokens set by `uptime-kuma` for users after successful authentication. The tokens are stored in `sessionStorage` or `localStorage` and remain valid without any time limitation, even after long periods of inactivity, increasing the risk of session hijacking. Additionally, previously issued tokens remain valid forever if a user changes their password, and sessions are only deleted on the client side after a user logs out, allowing a local attacker to reuse the token. This poses a high security risk, as user cookies can remain valid even after changing passwords or being inactive. **Recommendations** For versions prior to 1.23.3, update to version 1.23.3 or later to patch the issue. As a temporary workaround, consider logging out of all sessions after changing passwords and restricting access to sensitive areas of the application to minimize the risk of exploitation. Avoid using the `Remember Me` feature until the issue is resolved, and restrict access to the `sessionStorage` and `localStorage` to prevent unauthorized access to JWT tokens.