> For the complete documentation index, see [llms.txt](https://hacking-notes.jord4n.pro/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hacking-notes.jord4n.pro/fr/web-vulnerabilities/json-web-token-jwt-attack/jwt-pivoting-user-pentesting-web.md).
# Pivot d’utilisateur via JWT
## JWT-null :
Nous nous authentifions en tant que **utilisateur normal** « user » avec des privilèges *invité*:
Nous observons que nous avons un **cookie de session** dans le JWT :
Depuis le **terminal**, nous traduisons en **base64** le « Header » et le « Payload » en modifiant le numéro d’identification, puis nous supprimons le « Verify signature » :
Nous collons le nouveau **cookie de session** et obtenons des privilèges *normal*:
## JWT-secret
Lors du test de la méthode JWT null, cela **ne fonctionnerait pas** et la tentative échouerait.
L’idée serait d’essayer des mots de passe dans le **Verify signature**, par force brute ou un peu d’ingénierie inverse pour obtenir le cookie :
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