CVE-2026-26335: Calero VeraSMART < 2022 R1 Static IIS Machine Keys Enable ViewState RCE

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 3.0% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-02-13 · updated 2026-06-17
Weakness: CWE-321

Description

Calero VeraSMART versions prior to 2022 R1 use static ASP.NET/IIS machineKey values configured for the VeraSMART web application and stored in C:\\Program Files (x86)\\Veramark\\VeraSMART\\WebRoot\\web.config. An attacker who obtains these keys can craft a valid ASP.NET ViewState payload that passes integrity validation and is accepted by the application, resulting in server-side deserialization and remote code execution in the context of the IIS application.

Affected products

Calero VeraSMART: before 2022.0; 2022.0 — fixed in 2022.0

How to fix

Upgrade to a fixed version: Calero VeraSMART 2022.0. Check the vendor advisory for mitigations.

References

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