Security readout for executives and security teams
Plain-English summary
Older Calero VeraSMART systems may expose an unauthenticated remote service that lets an internet-reachable attacker read sensitive server files. Those files can include ASP.NET keys needed to forge ViewState data, potentially leading to remote code execution in IIS. The issue is critical because no login or user interaction is required.
Executive priority
Treat this as a top-priority remediation item for any VeraSMART deployment. A reachable vulnerable service could allow full application compromise without credentials, and sensitive key exposure may require follow-on credential and secret rotation.
Technical view
VeraSMART versions before 2022 R1 expose a .NET Remoting HTTP service on TCP 8001 with unsafe formatter behavior and Full TypeFilterLevel. Public advisory material describes arbitrary file read/write through exposed endpoints, web.config disclosure, machineKey recovery, ViewState-based RCE, and possible outbound SMB authentication leakage.
Likely exposure
Organizations running Calero VeraSMART before 2022 R1 are the stated exposure group, especially where TCP 8001 is reachable from untrusted networks. The bundle does not provide reliable CPEs or a full affected-version matrix.
Exploitation context
The source bundle does not show CISA KEV listing or active exploitation evidence. However, the described attack path is unauthenticated, remote, low-complexity, and can expose secrets enabling code execution, so exposed systems should be treated as urgent.
Researcher notes
Evidence is strongest for the Vulnerability Check advisory and CVE description. The affected product data in the bundle is sparse, so confirm versions with Calero. Avoid assuming exploitation in the wild unless new KEV or vendor intelligence appears.
Mitigation direction
- Identify all VeraSMART instances and confirm exact release versions.
- Upgrade affected systems to a Calero-supported non-affected release.
- Restrict TCP 8001 to trusted administrative networks only.
- Review Calero guidance before changing service behavior or configuration.
- Rotate exposed ASP.NET machineKey material if compromise is suspected.
- Monitor for unexpected outbound SMB authentication attempts.
Validation and detection
- Inventory VeraSMART hosts and verify whether any run versions before 2022 R1.
- Check whether TCP 8001 is reachable externally or from broad internal networks.
- Review IIS and application logs for suspicious remoting or ViewState activity.
- Confirm web.config and machineKey material were not exposed or reused.
- Validate compensating firewall controls after remediation.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-306: Credential and account abuse lookup
Authentication and credential weaknesses can make valid-account abuse and credential telemetry useful review starting points. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCWE-502: Code execution behavior lookup
Code execution and unsafe deserialization weaknesses often justify reviewing execution behavior and process telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupFile access behavior lookup
The CVE wording references file access or upload behavior, so file telemetry and web shell review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-26333 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 10 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H——VulnCheckVulnerability scoring details
Base CVSS 4.0 score
10CriticalVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://www.calero.com/CVE reference, VulnCheck · product
- https://www.vulncheck.com/advisories/calero-verasmart-2022-r1-net-remoting-arbitrary-file-read-leading-to-viewstate-rceCVE reference, VulnCheck · third-party-advisory
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Missing Authentication for Critical Function
Missing Authentication for Critical Function represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.
Deserialization of Untrusted Data
Deserialization of Untrusted Data represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.