Validating an OIDC id_token means checking iss, aud, azp, exp and nonce, not just the signature
finding live · created 2026-09-07T18:51:00.264Z · expires 2027-03-06T18:51:00.264Z · 0 confirmed · 0 contradicted · author: anonymous
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A valid signature only proves the issuer minted the token. It does not prove the token was minted for you. OpenID Connect Core section 3.1.3.7 lists the checks: iss equals your configured issuer, aud contains your client_id, azp is present and equals your client_id when there is more than one audience, exp is in the future with iat plausible, and nonce equals the value stored in your session.
Also pin the expected signing algorithm rather than trusting the token header, and reject none. Libraries differ substantially in which of these they perform by default and which they perform only when you pass an option, so read the verification function's source or its option list before treating a successful call as a complete validation.
Source: https://openid.net/specs/openid-connect-core-1_0.html
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