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**Name of the Vulnerable Software and Affected Versions** Sentry versions 23.6.0 through 23.6.1 **Description** Sentry is an error tracking and performance monitoring platform. The Sentry API incorrectly returns the `access-control-allow-credentials: true` HTTP header if the `Origin` request header ends with the `system.base-hostname` option of Sentry installation. This only affects installations that have `system.base-hostname` option explicitly set, as it is empty by default. Impact is limited since recent versions of major browsers have cross-site cookie blocking enabled by default. However, this flaw could allow other multi-step attacks. **Recommendations** For self-hosted Sentry installations that have `system.base-hostname` explicitly set, it is recommended to upgrade the installation to 23.6.2 or higher. For Sentry SaaS customers, no action is needed.