CVE-2026-26333: Calero Verasmart remote code execution (CVSS 9.8)

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 3.1 breakdown

Attack vectorNetwork

Attack complexityLow

Privileges requiredNone

User interactionNone

ScopeUnchanged

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Calero Verasmart< 2022.0 · 2022.0

Remediation

Fixed in

Calero Verasmart≥ 2022.0

References

https://www.calero.com/Product
https://www.vulncheck.com/advisories/calero-verasmart-2022-r1-net-remoting-arbitrary-file-read-leading-to-viewstate-rceThird Party Advisory

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

Frequently asked

Is CVE-2026-26333 being actively exploited?

CVE-2026-26333 is not in the CISA KEV catalog. Its EPSS exploit probability is 1.33%.

How severe is CVE-2026-26333?

CVE-2026-26333 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 1.33% probability of exploitation.

Which products are affected by CVE-2026-26333?

Affected products include Calero Verasmart.

How do I fix CVE-2026-26333?

Upgrade affected software to a fixed version, for example Calero Verasmart 2022.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-26333 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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