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Security: danslabs/Claude.ai-CSS-fixes

SECURITY.md

Security Policy

Supported Versions

Only the latest version receives fixes. This project does not maintain older release branches.

Version Supported
2026-03-31.x
< 2026-03-31

Always use the auto-update feature in Tampermonkey to stay on the latest version.


Security Scope

This script is intentionally minimal:

  • It injects a single <style> tag into https://claude.ai/* only
  • It does not manipulate the DOM
  • It does not collect, transmit, or store any data
  • It does not make any network requests of its own
  • It has no backend, no server, and no authentication

The main realistic attack surfaces are:

  • Supply chain via @updateURL - if this GitHub repo were compromised, a malicious update could be pushed to users automatically
  • CSS injection - a crafted CSS rule could theoretically be used to obscure UI elements or create visual phishing overlaps on the Claude.ai page

Reporting a Vulnerability

If you believe you have found a security issue in this script:

  1. Do not open a public GitHub issue for anything that could be exploited before it is fixed
  2. Report privately by emailing or sending a direct message via GitHub - contact details are on the profile page
  3. Include as much detail as possible - what the issue is, how it could be exploited, and any suggested fix if you have one

You can expect:

  • An acknowledgement within a few days
  • A fix or decision (accept/decline) within 7 days for anything confirmed
  • A public note in the changelog once resolved, without disclosing exploit details until patched

If the issue is declined, you will receive a clear explanation of why it falls outside scope.


Recommendations for Users

  • Only install userscripts from sources you trust
  • Review the script source before installing - it is short and readable by design
  • Keep Tampermonkey set to check for updates regularly
  • If you fork or modify this script, disable @updateURL and @downloadURL so your modified version does not silently receive upstream updates

There aren't any published security advisories