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fix(token): add reserved claim blocklist for custom scripts [C3] #545

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Merged
lakhansamani merged 1 commit into from
Apr 4, 2026
Merged

fix(token): add reserved claim blocklist for custom scripts [C3] #545

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25 changes: 23 additions & 2 deletions internal/token/auth_token.go
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Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,23 @@ import (
"github.com/authorizerdev/authorizer/internal/utils"
)

// reservedClaims are security-critical JWT claims that custom scripts must not override.
var reservedClaims = map[string]bool{
"sub": true,
"iss": true,
"aud": true,
"exp": true,
"iat": true,
"token_type": true,
"roles": true,
"allowed_roles": true,
"scope": true,
"nonce": true,
"login_method": true,
"at_hash": true,
"c_hash": true,
}

// AuthTokenConfig is the configuration for auth token
type AuthTokenConfig struct {
LoginMethod string
Expand Down Expand Up @@ -207,7 +224,9 @@ func (p *provider) CreateAccessToken(cfg *AuthTokenConfig) (string, int64, error
p.dependencies.Log.Debug().Err(err).Msg("error converting accessTokenScript response to map")
} else {
for k, v := range extraPayload {
customClaims[k] = v
if !reservedClaims[k] {
customClaims[k] = v
}
}
}
}
Expand Down Expand Up @@ -435,7 +454,9 @@ func (p *provider) CreateIDToken(cfg *AuthTokenConfig) (string, int64, error) {
p.dependencies.Log.Debug().Err(err).Msg("error converting accessTokenScript response to map")
} else {
for k, v := range extraPayload {
customClaims[k] = v
if !reservedClaims[k] {
customClaims[k] = v
}
}
}
}
Expand Down