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**Name of the Vulnerable Software and Affected Versions** TrueLayer.Client versions prior to v1.6.0 **Description** The issue could potentially allow a malicious actor to gain control over the destination URL of the HttpClient used in the API classes. For applications using the SDK, requests to unexpected resources on local networks or to the internet could be made, which could lead to information disclosure. The issue can be mitigated by having strict egress rules limiting the destinations to which requests can be made, and applying strict validation to any user input passed to the `truelayer-dotnet` library. **Recommendations** For versions prior to v1.6.0, consider having strict egress rules limiting the destinations to which requests can be made, and apply strict validation to any user input passed to the `truelayer-dotnet` library as a temporary workaround. Update to version v1.6.0 or later to resolve the issue.