Is CVE-2026-26335 actively exploited?

A proof-of-concept exploit is publicly available for CVE-2026-26335, but active exploitation has not been confirmed.

Can CVE-2026-26335 be exploited remotely?

Yes. CVE-2026-26335 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-26335?

CVE-2026-26335 has a CVSS score of 9.8 (CRITICAL) and an EPSS exploitation probability of 0.11%.

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CRITICALPOC

CVE-2026-26335

CWE-321Published: February 13, 2026· Updated: Feb 13, 2026

9.8

CVSS v3.1

EPSS:0.11%probability of exploitation in 30 daysPercentile:28.8th

Official 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.

NVD Source

Technical Analysis

CVE-2026-26335 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

A proof-of-concept (PoC) exploit exists for CVE-2026-26335. While not yet confirmed in active campaigns, the availability of PoC code increases exploitation risk substantially.