ClosedPatched

PHPMailer: PHPMailer Command Injection Vulnerability

PHPMailer

PHPMailer contains a command injection vulnerability because it fails to sanitize user-supplied input. Specifically, this issue affects the 'mail()' function of 'class.phpmailer.php' script. An attacker can exploit this issue to execute arbitrary code within the context of the application. Failed exploit attempts will result in a denial-of-service condition. Added to CISA KEV on 2025-07-07.

Why this severity: CVSS 9.8 (CISA ADP, v3.1); actively exploited (CISA KEV)

Started: Jul 7, 2025
Closed: Jul 7, 2025
CVE: CVE-2016-10033

Follow this incident

Updated Jul 7, 2025

Affected

See vendor advisory / CISA notes (versions not always listed in KEV feed)

Fixed in

See vendor advisory linked in sources

Timeline1

Jul 7, 2025
CISA added CVE-2016-10033 to the KEV catalog (due 2025-07-28).

Advisories4

Notes & caveats

Derived from CISA KEV JSON feed catalogVersion 2026.10.21. CVSS from the CVE record (cvelistV5). Exact affected/fixed version strings are not always in the KEV record; verify against the vendor advisory URL. startedAt uses dateAdded (exploitation may have begun earlier; many entries are older CVEs newly confirmed as exploited in 2025).

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