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xs-leaks

95 / 100 · Low risk

Fine to try.

By BitterSecurity/Decepticon (GitHub) · coding · 6,581 stars · scanned at commit bdb1016

XS-Leaks — cross-site information leaks via timing, frame counting, navigation, error oracles. Side-channel attacks against same-origin authenticated state.

Works with any agent that supports SKILL.md skills.

What this skill can do

Install

Paste this into your terminal. It downloads exactly the version we scanned, not whatever is newest.

if [ -e ~/.agents/skills/'xs-leaks' ] || [ -L ~/.agents/skills/'xs-leaks' ]; then echo 'A skill folder named xs-leaks already exists — not replacing it' >&2; false; else d=$(mktemp -d) && git clone --quiet --filter=blob:none --no-checkout 'https://github.com/BitterSecurity/Decepticon' "$d" && git -C "$d" checkout --quiet 'bdb1016c93ed687f61ac57481da298c25a47c8f5' -- 'packages/decepticon/decepticon/skills/standard/exploit/web/xs-leaks' && mkdir -p ~/.agents/skills && cp -R "$d"/'packages/decepticon/decepticon/skills/standard/exploit/web/xs-leaks' ~/.agents/skills/'xs-leaks' && rm -rf "$d"; fi

Codex reads ~/.agents/skills directly. For Claude Code, Cursor, Copilot, Gemini CLI, Antigravity or OpenCode, also link it. For Claude Code: ln -s ~/.agents/skills/'xs-leaks' ~/.claude/skills/'xs-leaks' (other agents: ~/.cursor/skills, ~/.copilot/skills, ~/.gemini/skills, ~/.gemini/config/skills, ~/.config/opencode/skills). Or install through the finder skill, which does both.

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