CVE-2026-25154 LocalSend has Stored XSS in Web Share Interface via Filename

Medium 6.1 Published 30 Jan 2026 Updated 2 Feb 2026

Attackers can inject malicious scripts via filenames in LocalSend's web share interface, potentially executing code or stealing data from users viewing the shared files.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2026-25154?

CVE-2026-25154 is a medium-severity cross-site scripting vulnerability in localsend, published on 30 Jan 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

LocalSend is a free, open-source app that allows users to share files and messages with nearby devices over their local network without needing an internet connection. In versions up to and including 1.17.0, when a user initiates a "Share via Link" session, the LocalSend application starts a local HTTP server to host the selected files. The client-side logic for this web interface is contained in `app/assets/web/main.js`. Note that at [0], the `handleFilesDisplay` function constructs the HTML for the file list by iterating over the files received from the server. Commit 8f3cec85aa29b2b13fed9b2f8e499e1ac9b0504c contains a patch.

Weakness: CWE-79

Which versions are affected by CVE-2026-25154?

It affects 1 product.

Products include Localsend Localsend.

How do I fix CVE-2026-25154?

No fix has been published for CVE-2026-25154 yet. Limit exposure of the affected software until one is available.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2026-25154 being exploited?

There is no known exploitation of CVE-2026-25154 in the wild and no public exploit code.

Sources

Also known as GHSA-34v6-52hh-x4r4.