Calero VeraSMART prior 2022 R1 Remoting HTTP Service WebRoot\\web.config WebClient missing authentication

Summaryinfo

A vulnerability, which was classified as critical, has been found in Calero VeraSMART. This affects the function WebClient of the file WebRoot\web.config of the component Remoting HTTP Service. The manipulation leads to missing authentication. This vulnerability is documented as CVE-2026-26333. The attack can be initiated remotely. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Calero VeraSMART. It has been rated as critical. This issue affects the function WebClient of the file WebRoot\\web.config of the component Remoting HTTP Service. The manipulation with an unknown input leads to a missing authentication vulnerability. Using CWE to declare the problem leads to CWE-306. The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Calero VeraSMART versions prior to 2022 R1 expose an unauthenticated .NET Remoting HTTP service on TCP port 8001. The service publishes default ObjectURIs (including EndeavorServer.rem and RemoteFileReceiver.rem) and permits the use of SOAP and binary formatters with TypeFilterLevel set to Full. An unauthenticated remote attacker can invoke the exposed remoting endpoints to perform arbitrary file read and write operations via the WebClient class. This allows retrieval of sensitive files such as WebRoot\\web.config, which may disclose IIS machineKey validation and decryption keys. An attacker can use these keys to generate a malicious ASP.NET ViewState payload and achieve remote code execution within the IIS application context. Additionally, supplying a UNC path can trigger outbound SMB authentication from the service account, potentially exposing NTLMv2 hashes for relay or offline cracking.

The weakness was released by Victor A. Morales. The identification of this vulnerability is CVE-2026-26333 since 02/13/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available.

Upgrading to version 2022 R1 eliminates this vulnerability.

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Productinfo

Vendor

• Calero

Name

• VeraSMART

CPE 2.3info

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CPE 2.2info

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