CVE-2021-3603
Inclusion of Functionality from Untrusted Control Sphere in PHPMailer/PHPMailer
Description
PHPMailer 6.4.1 and earlier contain a vulnerability that can result in untrusted code being called (if such code is injected into the host project's scope by other means). If the $patternselect parameter to validateAddress() is set to 'php' (the default, defined by PHPMailer::$validator), and the global namespace contains a function called php, it will be called in preference to the built-in validator of the same name. Mitigated in PHPMailer 6.5.0 by denying the use of simple strings as validator function names.
How to fix CVE-2021-3603
To remediate CVE-2021-3603, upgrade the affected package to a fixed version below.
- —upgrade to 6.4.2 or later
- —no fix listed
- —upgrade to 6.5.0 or later
Is CVE-2021-3603 being exploited?
Low — EPSS is 0.8%, meaning exploitation activity has not been observed at scale.
Affected packages (3)
- from 0, < 6.4.2
- from 0
- from 0, < 6.5.0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH8.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |