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huntrMnqazi4747A485-77C3-4BB5-AAB0-21253EF303CA
HistoryApr 20, 2023 - 11:00 a.m.

Account TakeOver Due to Improper Handling of JWT Tokens

2023-04-2011:00:09
mnqazi
www.huntr.dev
12
vulnerability
jwt tokens
data modification
authorization bypass
improper verification
information security

EPSS

0.002

Percentile

57.9%

Description

I have discovered a vulnerability where any user can modify another user’s data including password simply by intercepting and changing the access token of the JWT using https://token.dev. The system does not verify whether the JWT token was issued by the server or not, allowing it to accept the edited JWT token. This can lead to unauthorized modification or changing of the email address, and password and other personal data of any user.

Proof of Concept

https://drive.google.com/file/d/1aTd_eBkqEX-LpdbCKI3E_fP1rzCg_aYd/view?usp=sharing

EPSS

0.002

Percentile

57.9%

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