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

> Unauthenticated attackers can exploit .NET Remoting to read/write files, coerce authentication, and potentially execute code on Kofax Capture servers.

- **Severity:** Critical 9.3 (`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`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 23 Apr 2026
- **Updated:** 28 Jul 2026
- **Also known as:** GHSA-pc62-x5ww-3xm5

## What is CVE-2026-23751?

CVE-2026-23751 is a critical unsafe deserialization vulnerability in Tungsten Capture (formerly Kofax Capture), published on 23 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official 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.

Weakness: CWE-441 (Unintended Proxy or Intermediary), CWE-306 (Missing Authentication for Critical Functionality)

## Which versions are affected by CVE-2026-23751?


## How do I fix CVE-2026-23751?

No fix has been published for CVE-2026-23751 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-23751 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-23751 exists.

Public exploit code:

- Patched RemotingClient to exploit CVE-2026-23751 (Tungsten Automation - Kofax Capture Unauthenticated File Read/Write, Remote Code Execution and SMB coercion via .NET HTTP Remoting) (github_poc): https://github.com/SieBRUM/CVE-2026-23751-poc

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-23751 and fix it if it is affected.

What it is: CVE-2026-23751 is a critical unsafe deserialization vulnerability in Tungsten Capture (formerly Kofax Capture), published on 23 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-23751 exists.

Affected product: Tungsten Capture (formerly Kofax Capture). No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-23751/ (Markdown: https://insights.sbomify.com/CVE-2026-23751/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-23751
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-23751
- OSV: https://osv.dev/vulnerability/CVE-2026-23751

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-23751/
Summaries are generated and may contain mistakes; the official description above is the record.