CVE-2026-26333: Calero VeraSMART versions prior to 2022 R1 expose an unauthenticated .NET Remoting HTTP service on TCP port 80

Q: How do I fix CVE-2026-26333?

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

Q: Is CVE-2026-26333 being exploited?

CVE-2026-26333 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-2026-26333 affect?

CVE-2026-26333 affects verasmart. Severity is critical (CVSS 9.8). 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

Q: How urgent is CVE-2026-26333?

Priority 58/100. Critical severity; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

This month

CRITICAL 9.8REMOTEUPGRADE

CVE-2026-26333 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 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.

Why this priority

Critical severity
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	1.1% (top 35%)
CISA exploited list	No
Weakness	CWE-306, CWE-502
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 46 · php-pecl-yac · FIXED · 3.0.2-1.fc46 · FEDORA-2026-0322a78385 · source

sudo dnf upgrade --advisory=FEDORA-2026-0322a78385

Fedora ELN · openldap · FIXED · 2.6.16-1.eln159 · FEDORA-2026-4b30c86326 · source

sudo dnf upgrade --advisory=FEDORA-2026-4b30c86326

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-2026-26333?

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

Is CVE-2026-26333 being exploited?

CVE-2026-26333 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-2026-26333 affect?

CVE-2026-26333 affects verasmart. Severity is critical (CVSS 9.8). 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

How urgent is CVE-2026-26333?

Priority 58/100. Critical severity; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-26335 CRITICAL 9.8 UPGRADE Calero VeraSMART versions prior to 2022 R1 use static ASP.NET/IIS machineKey values configured for the VeraSMA
CVE-2026-26334 HIGH 7.8 UPGRADE Calero VeraSMART versions prior to 2026 R1 contain hardcoded static AES encryption keys within Veramark.Framew

References

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