Laravel and Symfony: Laravel CRLF Injection Vulnerability Enables an Attacker to Interfere with Outbound Email Processing

Laravel Framework Hit by High-Severity CRLF Injection Vulnerability (CVE-2026-48019)

A critical CRLF injection vulnerability in the Laravel framework, tracked as CVE-2026-48019, has been disclosed, exposing applications to email header manipulation and unauthorized email transmissions. The flaw affects Laravel versions up to 13.9.0 and those before 12.60.0, with patches released in 13.10.0 and 12.60.0.

The vulnerability arises from improper sanitization of carriage return and line feed (CRLF) sequences in email validation logic (classified as CWE-93). When user-supplied email inputs such as those from registration forms or password resets are processed without adequate sanitization, attackers can inject malicious control characters. This becomes particularly dangerous when combined with Laravel’s underlying Symfony Mailer and Symfony Mime components, which handle email delivery.

Exploitation allows attackers to alter email headers, modify message content, or redirect messages all without requiring authentication or user interaction. Potential impacts include unauthorized email redirection, phishing campaigns, or abuse of mail servers for relay attacks, posing significant risks to confidentiality and integrity. The vulnerability has been assigned a CVSS v3.1 base score of 8.3 (High), reflecting its network-based attack vector, low complexity, and potential for downstream system compromise.

Security researcher OmarXtream disclosed the flaw via GitHub advisory GHSA-5vg9-5847-vvmq, emphasizing the persistent risks of inadequate input validation in email handling. Organizations using affected Laravel versions particularly those processing untrusted email inputs are urged to upgrade immediately to mitigate exposure. While the maintainers have released patches, additional measures such as strict input validation and code review are recommended to prevent similar issues.

The incident underscores the ongoing threat posed by email-based attack vectors, which remain a prime target for indirect exploitation in modern applications.

Source: https://cybersecuritynews.com/laravel-crlf-injection-vulnerability/

Laravel TPRM report: https://www.rankiteo.com/company/laravel

Symfony TPRM report: https://www.rankiteo.com/company/symfony-sas

"id": "larsym1780489420",
"linkid": "laravel, symfony-sas",
"type": "Vulnerability",
"date": "6/2026",
"severity": "85",
"impact": "4",
"explanation": "Attack with significant impact with customers data leaks"

{'affected_entities': [{'customers_affected': 'Organizations using Laravel '
                                              'versions up to 13.9.0 and '
                                              'before 12.60.0',
                        'industry': 'Technology/Software Development',
                        'name': 'Laravel Framework',
                        'type': 'Software Framework'}],
 'attack_vector': 'Network',
 'description': 'A critical CRLF injection vulnerability in the Laravel '
                'framework, tracked as CVE-2026-48019, has been disclosed, '
                'exposing applications to email header manipulation and '
                'unauthorized email transmissions. The flaw affects Laravel '
                'versions up to 13.9.0 and those before 12.60.0, with patches '
                'released in 13.10.0 and 12.60.0. The vulnerability arises '
                'from improper sanitization of carriage return and line feed '
                '(CRLF) sequences in email validation logic (classified as '
                'CWE-93). Exploitation allows attackers to alter email '
                'headers, modify message content, or redirect messages without '
                'requiring authentication or user interaction. Potential '
                'impacts include unauthorized email redirection, phishing '
                'campaigns, or abuse of mail servers for relay attacks.',
 'impact': {'brand_reputation_impact': 'Potential reputational damage due to '
                                       'phishing or unauthorized email '
                                       'activities',
            'operational_impact': 'Unauthorized email transmissions, email '
                                  'header manipulation, potential phishing '
                                  'campaigns, and mail server abuse',
            'systems_affected': 'Laravel applications using versions up to '
                                '13.9.0 and before 12.60.0'},
 'lessons_learned': 'The incident underscores the ongoing threat posed by '
                    'email-based attack vectors and the importance of proper '
                    'input validation in email handling.',
 'post_incident_analysis': {'corrective_actions': 'Patch management, input '
                                                  'validation, and code review',
                            'root_causes': 'Improper sanitization of CRLF '
                                           'sequences in email validation '
                                           'logic'},
 'recommendations': 'Upgrade to patched versions (13.10.0 or 12.60.0), '
                    'implement strict input validation, and conduct code '
                    'reviews to prevent similar vulnerabilities.',
 'references': [{'source': 'GitHub Advisory', 'url': 'GHSA-5vg9-5847-vvmq'}],
 'response': {'containment_measures': 'Upgrade to patched versions (13.10.0 or '
                                      '12.60.0)',
              'remediation_measures': 'Apply patches, implement strict input '
                                      'validation, and conduct code reviews'},
 'title': 'Laravel Framework Hit by High-Severity CRLF Injection Vulnerability '
          '(CVE-2026-48019)',
 'type': 'Vulnerability Exploitation',
 'vulnerability_exploited': 'CVE-2026-48019 (CWE-93 - CRLF Injection)'}