Vulnerability Intelligence Report
Inclusion of Functionality from Untrusted Control Sphere in PHPMailer/PHPMailer
CVE-2021-3603
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.
No Active Exploit Signals
CVSS Base Score
8.1
HIGH
Exploitability:2.3
Impact Score:5.9
EPSS Probability:2.26%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
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Authentication
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Weaponization
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SSVC Action
—
Weaknesses (CWE)
CWE-829 ↗CWE-829 Inclusion of Functionality from Untrusted Control Sphere
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| PHPMailer | PHPMailer | unspecified < 6.5.0 (affected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
EPSS Score
2.260%
GitHub Advisory
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | @huntrdev |
| Reserved | 2021-06-15T00:00:00 |
| Published | 2021-06-17T12:09:42 |
| Last Updated | 2024-08-03T17:01:07 |
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