How severe is CVE-2026-26335?

CVE-2026-26335 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-26335 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (85th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-26335?

CVE-2026-26335 primarily affects Calero Verasmart. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-26335?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-26335 have an EU (EUVD) identifier?

Yes. CVE-2026-26335 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-7363.

When was CVE-2026-26335 published?

CVE-2026-26335 was published on 2026-02-13 and last updated on 2026-06-17.

CVE-2026-26335

CVE-2026-26335 is a critical-severity vulnerability in Calero Verasmart with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-321.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v4: 9.3
EPSS exploit prediction: 3% (85th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-7363
Weakness: CWE-321
Affected product: Calero Verasmart
Published: 2026-02-13
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-26335?: 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.
How severe is CVE-2026-26335?: CVE-2026-26335 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-26335 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (85th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-26335?: CVE-2026-26335 primarily affects Calero Verasmart. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-26335?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-26335 have an EU (EUVD) identifier?: Yes. CVE-2026-26335 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-7363.
When was CVE-2026-26335 published?: CVE-2026-26335 was published on 2026-02-13 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:a:calero:verasmart:*:*:*:*:*:*:*:*
cpe:2.3:a:calero:verasmart:2022.0:-:*:*:*:*:*:*

More vulnerabilities in Calero Verasmart

CVE-2026-26333 — Critical (CVSS 9.8): Calero VeraSMART versions prior to 2022 R1 expose an unauthenticated .NET Remoting HTTP service on TCP port 8001. The…
CVE-2026-26334 — High (CVSS 7.8): Calero VeraSMART versions prior to 2026 R1 contain hardcoded static AES encryption keys within Veramark.Framework.dll…

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