CVE-2007-1718: CRLF injection vulnerability in the mail function in PHP 4.0.0 through 4.4.6 and 5.0.0 through 5.2.1 allows...

Security readout for executives and security teams

This is an old PHP mail handling flaw that could let a remote user add unintended email headers when an application passes unsafe input into Subject or To. The main business risk is abuse of affected systems for spam or misleading outbound email, not evidence of system takeover. Exposure is most likely in legacy applications still running affected PHP versions and using mail() with user-controlled Subject or To values. Modern maintained PHP deployments should not be affected if vendor updates were applied. Treat this as a legacy exposure cleanup item unless affected PHP versions are internet-facing or send business email. Prioritize remediation where outdated PHP handles contact forms, account workflows, or bulk outbound mail. Mitigation focus: Upgrade affected PHP versions using vendor or distribution advisories.; Prioritize systems still running PHP 4.x or PHP 5.0 through 5.2.1.; Review mail() call sites that accept user-controlled Subject or To values..

Prepared

Jun 29, 2026, 06:37 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.