EXECUTIVE SUMMARY:
CVE-2026-48019 with a CVSS score of 9.8 is a high‑severity CRLF injection flaw in the Laravel framework that affects all releases up to 13.9.0 and any version prior to 12.60.0; the vulnerability stems from inadequate neutralization of carriage‑return and line‑feed characters in the email validation routine, which Laravel passes directly to the underlying Symfony Mailer and Mime components. An attacker can exploit the issue by supplying a malicious email address—e.g., through registration, password‑reset, or contact‑form fields—containing crafted CRLF sequences; no authentication, privileged access, or user interaction is required, and the attack vector is purely network‑based. By injecting these control characters, the adversary can alter email headers, inject additional recipients, modify message bodies, or trigger unsolicited transmissions, effectively gaining the ability to redirect sensitive communications, conduct phishing campaigns, or abuse the application’s mail server for relay attacks. The business impact includes severe confidentiality and integrity breaches, potential reputational harm, mail server blocklisting, and regulatory repercussions, especially for organizations that rely on transactional or authentication‑related emails. Exploitation requires that the application accept untrusted email input without proper sanitization and that the vulnerable Laravel version be deployed in a publicly reachable environment.[/subscribe_to_unlock_form]
EXECUTIVE SUMMARY:
CVE-2026-48019 with a CVSS score of 9.8 is a high‑severity CRLF injection flaw in the Laravel framework that affects all releases up to 13.9.0 and any version prior to 12.60.0; the vulnerability stems from inadequate neutralization of carriage‑return and line‑feed characters in the email validation routine, which Laravel passes directly to the underlying Symfony Mailer and Mime components. An attacker can exploit the issue by supplying a malicious email address—e.g., through registration, password‑reset, or contact‑form fields—containing crafted CRLF sequences; no authentication, privileged access, or user interaction is required, and the attack vector is purely network‑based. By injecting these control characters, the adversary can alter email headers, inject additional recipients, modify message bodies, or trigger unsolicited transmissions, effectively gaining the ability to redirect sensitive communications, conduct phishing campaigns, or abuse the application’s mail server for relay attacks. The business impact includes severe confidentiality and integrity breaches, potential reputational harm, mail server blocklisting, and regulatory repercussions, especially for organizations that rely on transactional or authentication‑related emails. Exploitation requires that the application accept untrusted email input without proper sanitization and that the vulnerable Laravel version be deployed in a publicly reachable environment.[emaillocker id="1283"]
RECOMMENDATION:
REFERENCES:
The following reports contain further technical details:
https://cybersecuritynews.com/laravel-crlf-injection-vulnerability/