Vulnerability Description
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.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Calero | Verasmart | < 2022.0 |
Related Weaknesses (CWE)
References
- https://www.calero.com/Product
- https://www.vulncheck.com/advisories/calero-verasmart-2022-r1-net-remoting-arbitThird Party Advisory
FAQ
What is CVE-2026-26333?
CVE-2026-26333 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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 RemoteFileR...
How severe is CVE-2026-26333?
CVE-2026-26333 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-26333?
Check the references section above for vendor advisories and patch information. Affected products include: Calero Verasmart.