# CVE-2025-54792: LocalSend is Vulnerable to Man-in-the-Middle Attacks, Leading to File Interception

> An attacker on the local network can intercept and modify file transfers via a Man-in-the-Middle vulnerability in the discovery protocol.

- **Severity:** Critical 9.3 (`CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:H/SI:H/SA:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 1 Aug 2025
- **Updated:** 4 Aug 2025
- **Also known as:** GHSA-424h-5f6m-x63f

## What is CVE-2025-54792?

CVE-2025-54792 is a critical vulnerability in localsend, published on 1 Aug 2025. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

LocalSend is an open-source app to securely share files and messages with nearby devices over local networks without needing an internet connection. In versions 1.16.1 and below, a critical Man-in-the-Middle (MitM) vulnerability in the software's discovery protocol allows an unauthenticated attacker on the same local network to impersonate legitimate devices, silently intercepting, reading, and modifying any file transfer. This can be used to steal sensitive data or inject malware, like ransomware, into files shared between trusted users. The attack is hardly detectable and easy to implement, posing a severe and immediate security risk. This issue was fixed in version 1.17.0.

Weakness: CWE-345 (Insufficient Verification of Data Authenticity), CWE-300 (Channel Accessible by Non-Endpoint)

## Which versions are affected by CVE-2025-54792?

It affects 1 product.


Products: Localsend Localsend.

## How do I fix CVE-2025-54792?

No fix has been published for CVE-2025-54792 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-54792 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-54792 exists.

## Other vulnerabilities in localsend

- [CVE-2025-27142](https://insights.sbomify.com/CVE-2025-27142/): LocalSend path traversal vulnerability in the file upload endpoint allows nearby devices to execute arbitrary commands (medium 6.3)
- [CVE-2026-25154](https://insights.sbomify.com/CVE-2026-25154/): LocalSend has Stored XSS in Web Share Interface via Filename (medium 6.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-54792 and fix it if it is affected.

What it is: CVE-2025-54792 is a critical vulnerability in localsend, published on 1 Aug 2025. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-54792 exists.

Affected product: localsend. 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-2025-54792/ (Markdown: https://insights.sbomify.com/CVE-2025-54792/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-54792
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-54792
- OSV: https://osv.dev/vulnerability/CVE-2025-54792

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-54792/
Summaries are generated and may contain mistakes; the official description above is the record.