Security readout for executives and security teams
Plain-English summary
CVE-2026-26222 is a critical flaw in Altec DocLink 4.0.336.0, now associated with Beyond Limits Inc. A network attacker may access the DocLink remoting service without logging in, read or write server files, and in some configurations achieve remote code execution or denial of service.
Executive priority
Treat this as a high-priority remediation item for any affected DocLink deployment. The business risk is unauthorized access to sensitive files, service disruption, and possible server compromise if file writes reach executable web paths.
Technical view
The issue involves unauthenticated .NET Remoting endpoints exposed by Altec.RDCHostService.exe over TCP and HTTP/SOAP using ObjectURI doclinkServer.soap. Unsafe unmarshalling and file path handling allow arbitrary file read, SMB authentication coercion via UNC paths, and arbitrary file write. Web-accessible writable paths under IIS may turn file write into RCE.
Likely exposure
Organizations running Altec DocLink version 4.0.336.0 are the identified affected population. Exposure is highest where DocLink remoting services are reachable from untrusted networks or where IIS serves writable locations accessible to the service.
Exploitation context
The source bundle does not show CISA KEV listing or cited evidence of active exploitation. However, the issue is network-reachable, unauthenticated, low-complexity, and rated CVSS 10.0, so exposed systems should be treated as urgent.
Researcher notes
Evidence comes from the CVE record and VulnCheck advisory. Public sources identify one affected version, 4.0.336.0. No patch version is named in the provided sources. Avoid assuming exploitation in the wild without additional KEV or vendor confirmation.
Mitigation direction
- Identify whether Altec DocLink 4.0.336.0 is deployed.
- Restrict DocLink remoting access to trusted hosts or management networks.
- Block untrusted access to exposed TCP and HTTP/SOAP remoting interfaces.
- Review IIS writable paths and remove unnecessary write permissions.
- Check Beyond Limits or DocLink vendor guidance for patches or supported mitigations.
- Monitor for unusual file access, file creation, or outbound SMB authentication attempts.
Validation and detection
- Inventory hosts running Altec.RDCHostService.exe or DocLink services.
- Confirm whether doclinkServer.soap remoting endpoints are reachable from untrusted networks.
- Review DocLink version information for 4.0.336.0.
- Check IIS mappings for writable directories served as web content.
- Examine logs for unexpected local file reads, writes, or SMB connections.
- Validate that network controls prevent unauthenticated external access.
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-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 lookupCWE-918: Information exposure and cloud metadata lookup
Information exposure and SSRF weaknesses can make discovery, cloud metadata, and credential material review relevant. 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-2026-26222 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.
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——Primary CVE scoreVulnerability 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
Source materials
- CVE List V5 sourceCVE List V5
- https://doclinkai.com/CVE reference · product
- https://www.vulncheck.com/advisories/doclink-net-remoting-unauthenticated-arbitrary-file-read-write-rceCVE reference · 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.
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.
Server-Side Request Forgery (SSRF)
Server-Side Request Forgery (SSRF) represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.