CVE-2026-121553
Medium
Description
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.
SeverityMedium
CVSS4.8
Exploit probability—
Product
Cotonti
PublishedNov 3, 2026
First seenNov 4, 2026
Weakness typeCWE-338CWE-338
How to fix
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| cotonti cotonti | v ≤ 1.0.0 | — |
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