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    Repair CSRF Session Boundary Bugs

    1

    Repair CSRF and session-boundary bugs involving token rotation, Origin/Referer checks, login/logout transitions, SameSite assumptions, multi-tab state, unsafe methods, and stale session generations.

    $8.99

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    See it in action

    You say

    Our SPA keeps one CSRF token for the browser lifetime. After logout/login as another user, the same token is still accepted because it is not tied to the server session. Repair with local request fixtures and keep existing auth/session lifetime policy.

    Your agent does

    The CSRF token has browser lifetime instead of authenticated-session lifetime. The repair binds validation to the active session generation, rotates/invalidates it at existing login/logout boundaries, preserves Origin/SameSite policy, and tests account switch, multi-tab logout, old token replay, safe/unsafe methods, and allowed-origin behavior.

    What you get

    Resolve multi-tab CSRF token expiration conflictsAlign SameSite and Origin policies across servicesFix race conditions in session rotation during login/logoutStandardize session cleanup and state ownership logic

    About this skill

    The problem

    CSRF and session handling often break due to inconsistent state ownership, race conditions in multi-tab environments, or mismatched trust boundaries across components. Manually tracing these leaky abstractions leads to regression bugs or accidental security downgrades.

    What it does

    • Identifies and repairs inconsistent CSRF token binding and session rotation logic.
    • Reconstructs concurrent timelines to fix race conditions in multi-tab behavior and token consumption.
    • Relocates validation logic to occur before irreversible state mutations or dispatches.
    • Synchronizes Origin, Referer, and SameSite policies across the entire repository.
    • Generates deterministic local test fixtures and redacted observability metrics for regression testing.

    Why this beats prompting it yourself

    General prompts often suggest "quick fixes" like disabling validation or increasing timeouts, which introduce security risks. This skill enforces strict safety rules that preserve existing authentication policies and session lifetimes while ensuring repairs are verifiable through local loopback tests.

    Use cases

    • Fixing 403 Forbidden errors caused by CSRF token expiration in multi-tab web apps.
    • Hardening session boundaries during login/logout state transitions.
    • Aligning SameSite cookie attributes with modern browser security requirements.
    • Adding redacted logging to session lifecycle events for easier debugging.

    Known limitations

    Operates strictly on repository files and local fixtures. Cannot access production services, live secrets, or customer data.

    How to install

    Drop the file into your AI Agent. Works with Claude, Cursor, ChatGPT, and 20+ more.

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