CVE-2026-121553
mediumCotonti through 1.0.0 generates registration and email-change validation tokens with md5(microtime()), allowing attackers to bypass email-ownership verificatio…
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.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://github.com/Cotonti/Cotonti disclosure@vulncheck.com
- https://github.com/Cotonti/Cotonti/blob/1.0.0/modules/users/inc/users.functions.php#L97 disclosure@vulncheck.com
- https://github.com/Cotonti/Cotonti/blob/1.0.0/modules/users/inc/users.profile.php#L116 disclosure@vulncheck.com
- https://github.com/Cotonti/Cotonti/blob/1.0.0/modules/users/inc/users.register.php#L148 disclosure@vulncheck.com
- https://github.com/Cotonti/Cotonti/issues/1904 disclosure@vulncheck.com
- https://github.com/Cotonti/Cotonti/pull/1905 disclosure@vulncheck.com
- https://www.vulncheck.com/advisories/cotonti-through-1.0.0-predictable-validation-tokens-v... disclosure@vulncheck.com