MEDIUM 6.3 NVD
CVE-2026-121553
Cotonti through 1.0.0 generates registration and email-change validation tokens with md5(microtime()), allowing attackers to bypass email-ownership verification
Cotonti through 1.0.0 generates registration and email-change validation tokens with md5(microtime()), allowing attackers to bypass email-ownership verification by predicting tokens. Attackers can derive the generation time from the HTTP Date header and compute candidate tokens offline. They then submit these tokens to the users.register.php validate handler to activate accounts or confirm email addresses they do not control.
References
- https://github.com/Cotonti/Cotonti
- https://github.com/Cotonti/Cotonti/blob/1.0.0/modules/users/inc/users.functions.php#L97
- https://github.com/Cotonti/Cotonti/blob/1.0.0/modules/users/inc/users.profile.php#L116
- https://github.com/Cotonti/Cotonti/blob/1.0.0/modules/users/inc/users.register.php#L148
- https://github.com/Cotonti/Cotonti/issues/1904
This medium severity vulnerability with a CVSS score of 6.3 was published on 2026-11-03 via NVD.
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