CVE-2026-23751: CWE-306 Missing Authentication for Critical Function in Tungsten Automation Tungsten Capture (formerly Kofax Capture)
Kofax Capture, now referred to as Tungsten Capture, version 6.0.0.0 (other versions may be affected) exposes a deprecated .NET Remoting HTTP channel on port 2424 via the Ascent Capture Service that is accessible without authentication and uses a default, publicly known endpoint identifier. An unauthenticated remote attacker can exploit .NET Remoting object unmarshalling techniques to instantiate a remote System.Net.WebClient object and read arbitrary files from the server filesystem, write attacker-controlled files to the server, or coerce NTLMv2 authentication to an attacker-controlled host, enabling sensitive credential disclosure, denial of service, remote code execution, or lateral movement depending on service account privileges and network environment.
AI Analysis
Technical Summary
CVE-2026-23751 affects Tungsten Capture version 6.0.0.0 by exposing a deprecated .NET Remoting HTTP channel on port 2424 via the Ascent Capture Service. This channel is accessible without authentication and uses a default endpoint identifier, enabling unauthenticated remote attackers to perform .NET Remoting object unmarshalling attacks. Exploitation can instantiate a remote System.Net.WebClient object to read or write arbitrary files on the server filesystem or coerce NTLMv2 authentication to an attacker-controlled host. Depending on the privileges of the service account and network environment, this can lead to sensitive credential disclosure, denial of service, remote code execution, or lateral movement within the network. The vulnerability is classified under CWE-306 (Missing Authentication for Critical Function) and CWE-441 (Unintended Proxy or Intermediary). The CVSS 4.0 base score is 9.3, indicating critical severity. No patch or official remediation has been published, and the product is not a cloud service.
Potential Impact
The vulnerability allows unauthenticated remote attackers to bypass authentication controls on a critical service, enabling them to read and write arbitrary files on the affected server. Attackers can also coerce NTLMv2 authentication to attacker-controlled hosts, potentially disclosing sensitive credentials. Depending on the privileges of the service account and network context, this can result in denial of service, remote code execution, or lateral movement within the victim's network. The critical CVSS score reflects the high impact and ease of exploitation due to no required privileges or user interaction.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, organizations should consider disabling or restricting access to the .NET Remoting HTTP channel on port 2424, implement network-level controls to limit exposure, and monitor for unusual activity related to this service. Avoid exposing the affected service to untrusted networks. Follow vendor updates closely for any forthcoming patches or official mitigations.
CVE-2026-23751: CWE-306 Missing Authentication for Critical Function in Tungsten Automation Tungsten Capture (formerly Kofax Capture)
Description
Kofax Capture, now referred to as Tungsten Capture, version 6.0.0.0 (other versions may be affected) exposes a deprecated .NET Remoting HTTP channel on port 2424 via the Ascent Capture Service that is accessible without authentication and uses a default, publicly known endpoint identifier. An unauthenticated remote attacker can exploit .NET Remoting object unmarshalling techniques to instantiate a remote System.Net.WebClient object and read arbitrary files from the server filesystem, write attacker-controlled files to the server, or coerce NTLMv2 authentication to an attacker-controlled host, enabling sensitive credential disclosure, denial of service, remote code execution, or lateral movement depending on service account privileges and network environment.
CVSS v4.0
Score 9.3critical
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-23751 affects Tungsten Capture version 6.0.0.0 by exposing a deprecated .NET Remoting HTTP channel on port 2424 via the Ascent Capture Service. This channel is accessible without authentication and uses a default endpoint identifier, enabling unauthenticated remote attackers to perform .NET Remoting object unmarshalling attacks. Exploitation can instantiate a remote System.Net.WebClient object to read or write arbitrary files on the server filesystem or coerce NTLMv2 authentication to an attacker-controlled host. Depending on the privileges of the service account and network environment, this can lead to sensitive credential disclosure, denial of service, remote code execution, or lateral movement within the network. The vulnerability is classified under CWE-306 (Missing Authentication for Critical Function) and CWE-441 (Unintended Proxy or Intermediary). The CVSS 4.0 base score is 9.3, indicating critical severity. No patch or official remediation has been published, and the product is not a cloud service.
Potential Impact
The vulnerability allows unauthenticated remote attackers to bypass authentication controls on a critical service, enabling them to read and write arbitrary files on the affected server. Attackers can also coerce NTLMv2 authentication to attacker-controlled hosts, potentially disclosing sensitive credentials. Depending on the privileges of the service account and network context, this can result in denial of service, remote code execution, or lateral movement within the victim's network. The critical CVSS score reflects the high impact and ease of exploitation due to no required privileges or user interaction.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, organizations should consider disabling or restricting access to the .NET Remoting HTTP channel on port 2424, implement network-level controls to limit exposure, and monitor for unusual activity related to this service. Avoid exposing the affected service to untrusted networks. Follow vendor updates closely for any forthcoming patches or official mitigations.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-01-15T18:42:20.938Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69ea9e7887115cfb686fc41d
Added to database: 4/23/2026, 10:34:32 PM
Last enriched: 5/26/2026, 7:41:47 AM
Last updated: 6/8/2026, 2:53:58 AM
Views: 80
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