CVE-2026-26335: Calero VeraSMART versions prior to 2022 R1 use static ASP.NET/IIS machineKey values configured for the VeraSMA

Q: How do I fix CVE-2026-26335?

verasmart: upgrade to 2022.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-26335 being exploited?

CVE-2026-26335 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-26335 affect?

CVE-2026-26335 affects verasmart. Severity is critical (CVSS 9.8). 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

Q: How urgent is CVE-2026-26335?

Priority 69/100. Critical severity; Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2026-26335 is a critical-severity flaw (CVSS 9.8) affecting verasmart. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Critical severity
Public exploit reference
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	3.0% (top 13%)
CISA exploited list	No
Weakness	CWE-321
Published	2026-02-13
Last modified	2026-06-17

Publisher (CNA): VulnCheck · Vendor: calero

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-02-13 21:16 UTCPublished CVE record published
2026-06-17 10:26 UTCUpdated Record last modified

calero verasmart UPGRADE

Affected: < 2022.0 · 2022.0

Fixed in: 2022.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy verasmart || rpm -q verasmart || verasmart --version

2. UPGRADE to 2022.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade verasmart

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade verasmart

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Exact fixes by distribution

Fedora ELN · intel-ipsec-mb · FIXED · 3.0.1-1.eln159 · FEDORA-2026-ca01077210 · source

sudo dnf upgrade --advisory=FEDORA-2026-ca01077210

Fedora 46 · complytime-providers · FIXED · 0.3.0-2.fc46 · FEDORA-2026-7c372be466 · source

sudo dnf upgrade --advisory=FEDORA-2026-7c372be466

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

GitHub PoC: mbanyamer/CVE-2026-26335-Calero-VeraSMART-RCE (0 stars)
Exploit-DB: Repetier-Server 1.4.10 - Path Traversal

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-26335?

verasmart: upgrade to 2022.0. Exact commands for each OS are on this page.

Is CVE-2026-26335 being exploited?

CVE-2026-26335 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-26335 affect?

CVE-2026-26335 affects verasmart. Severity is critical (CVSS 9.8). 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

How urgent is CVE-2026-26335?

Priority 69/100. Critical severity; Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

Software pages

.NET vulnerabilities

Related CVEs

CVE-2026-26334 HIGH 7.8 UPGRADE Calero VeraSMART versions prior to 2026 R1 contain hardcoded static AES encryption keys within Veramark.Framew
CVE-2026-26333 CRITICAL 9.8 UPGRADE Calero VeraSMART versions prior to 2022 R1 expose an unauthenticated .NET Remoting HTTP service on TCP port 80

References

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