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JWT Token Validation in API Security / CWAF

  • 1.  JWT Token Validation in API Security / CWAF

    Posted 09-08-2026 05:18

    Hi 

    I want to do validation for JWT token. JWT token need to validate with JWK 

    can cwaf rules accomodate that validation ?


    #APISecurity

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    Aloysius Erwin
    Solutions Engineer
    PT Exclusive Networks Indonesia
    Jakarta
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  • 2.  RE: JWT Token Validation in API Security / CWAF

    Posted 09-15-2026 04:26

    Hi Aloysius,

    CWAF Custom Rules use a proprietary pattern-matching and logic engine.They do not have a built-in cryptographic engine to perform asymmetric/symmetric signature verification.

    What CWAF Custom Rules Can Do for JWTs

    Header Presence: Block requests where the Authorization header or custom token header is missing

    Format & Syntax Checks: Use regex to verify that the header contains a standard three-part base64-encoded JWT structure

    Static Header Matching: Inspect or block specific static header values or known bad signatures

    Regards

    Ankit Sharma



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    Ankit Sharma
    Cloud Security Engineer | Enterprise Services
    Imperva
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