diff --git a/src/main/java/org/cryptomator/common/mount/MountPointInUseException.java b/src/main/java/org/cryptomator/common/mount/MountPointInUseException.java
new file mode 100644
index 000000000..9f7f11174
--- /dev/null
+++ b/src/main/java/org/cryptomator/common/mount/MountPointInUseException.java
@@ -0,0 +1,8 @@
+package org.cryptomator.common.mount;
+
+public class MountPointInUseException extends IllegalMountPointException {
+
+	public MountPointInUseException(String msg) {
+		super(msg);
+	}
+}
diff --git a/src/main/java/org/cryptomator/common/mount/Mounter.java b/src/main/java/org/cryptomator/common/mount/Mounter.java
index 0161268f3..a56f2b01b 100644
--- a/src/main/java/org/cryptomator/common/mount/Mounter.java
+++ b/src/main/java/org/cryptomator/common/mount/Mounter.java
@@ -97,7 +97,11 @@ public class Mounter {
 				}
 			} else {
 				var mpIsDriveLetter = userChosenMountPoint.toString().matches("[A-Z]:\\\\");
-				if (!mpIsDriveLetter && canMountToParent && !canMountToDir) {
+				if (mpIsDriveLetter) {
+					if (driveLetters.getOccupied().contains(userChosenMountPoint)) {
+						throw new MountPointInUseException(userChosenMountPoint.toString());
+					}
+				} else if (canMountToParent && !canMountToDir) {
 					MountWithinParentUtil.prepareParentNoMountPoint(userChosenMountPoint);
 					cleanup = () -> {
 						MountWithinParentUtil.cleanup(userChosenMountPoint);
diff --git a/src/main/java/org/cryptomator/ui/unlock/UnlockInvalidMountPointController.java b/src/main/java/org/cryptomator/ui/unlock/UnlockInvalidMountPointController.java
index 7bc0cbccd..b07e3ffde 100644
--- a/src/main/java/org/cryptomator/ui/unlock/UnlockInvalidMountPointController.java
+++ b/src/main/java/org/cryptomator/ui/unlock/UnlockInvalidMountPointController.java
@@ -1,5 +1,6 @@
 package org.cryptomator.ui.unlock;
 
+import org.cryptomator.common.mount.MountPointInUseException;
 import org.cryptomator.common.mount.MountPointNotExistsException;
 import org.cryptomator.common.mount.MountPointNotSupportedException;
 import org.cryptomator.common.vaults.Vault;
@@ -41,6 +42,7 @@ public class UnlockInvalidMountPointController implements FxController {
 		var translationKey = switch (e) {
 			case MountPointNotSupportedException x -> "unlock.error.customPath.description.notSupported";
 			case MountPointNotExistsException x -> "unlock.error.customPath.description.notExists";
+			case MountPointInUseException x -> "unlock.error.customPath.description.inUse";
 			default -> "unlock.error.customPath.description.generic";
 		};
 		dialogDescription.setFormat(resourceBundle.getString(translationKey));
diff --git a/src/main/resources/i18n/strings.properties b/src/main/resources/i18n/strings.properties
index d38d542ee..ca051269a 100644
--- a/src/main/resources/i18n/strings.properties
+++ b/src/main/resources/i18n/strings.properties
@@ -130,6 +130,7 @@ unlock.success.revealBtn=Reveal Drive
 unlock.error.customPath.message=Unable to mount vault to custom path
 unlock.error.customPath.description.notSupported=If you wish to keep using the custom path, please go to the preferences and select a volume type that supports it. Otherwise, go to the vault options and choose a supported mount point.
 unlock.error.customPath.description.notExists=The custom mount path does not exist. Either create it in your local filesystem or change it in the vault options.
+unlock.error.customPath.description.inUse=Drive letter "%s" is already in use.
 unlock.error.customPath.description.generic=You have selected a custom mount path for this vault, but using it failed with the message: %s
 ## Hub
 hub.noKeychain.message=Unable to access device key
diff --git a/suppression.xml b/suppression.xml
index e7cc4ea65..36b795480 100644
--- a/suppression.xml
+++ b/suppression.xml
@@ -55,4 +55,12 @@
 		<cve>CVE-2022-45688</cve>
 	</suppress>
 
-</suppressions>
\ No newline at end of file
+	<suppress>
+		<notes><![CDATA[
+		False positive for jackson-databind-2.14.2.jar, see https://github.com/FasterXML/jackson-databind/issues/3972
+   ]]></notes>
+		<packageUrl regex="true">^pkg:maven/com\.fasterxml\.jackson\.core/jackson\-databind@.*$</packageUrl>
+		<cve>CVE-2023-35116</cve>
+	</suppress>
+
+</suppressions>