High-Severity Laravel CRLF Injection Vulnerability Discovered
Severity: High (Score: 72.0)
Sources: Gbhackers, Cybersecuritynews
Published: · Updated:
Keywords: laravel, outbound, email, crlf, injection, vulnerability, processing
Severity indicators: vulnerability
Summary
A critical CRLF injection vulnerability in the Laravel framework, tracked as CVE-2026-48019, could allow attackers to manipulate outbound email processing in affected applications. This flaw affects Laravel versions up to 13.9.0 and versions before 12.60.0, potentially leading to unauthorized message delivery and data exposure. The vulnerability arises from improper neutralization of CRLF sequences in the framework's default email validation logic. Patches have been released in versions 13.10.0 and 12.60.0 to address this issue. Security professionals are urged to update their systems promptly to mitigate risks associated with this vulnerability. Key Points: • CVE-2026-48019 is a high-severity CRLF injection vulnerability in Laravel. • Affected versions include Laravel 13.9.0 and earlier, and 12.60.0 and earlier. • Patches are available in Laravel versions 13.10.0 and 12.60.0.
Detailed Analysis
**Impact** Organizations using Laravel framework versions up to 13.9.0 and before 12.60.0 are affected globally. The vulnerability allows attackers to manipulate outbound email processing, potentially causing unauthorized message delivery, data exposure, and abuse of mail relays. This can disrupt business communications and expose sensitive information handled via email systems integrated with Laravel applications. **Technical Details** The vulnerability, tracked as CVE-2026-48019, results from improper neutralization of CRLF sequences in Laravel’s default email validation logic. Attackers exploit CRLF injection to interfere with outbound email handling, impacting Laravel versions up to 13.9.0 and before 12.60.0. No specific malware, tools, or IOCs were mentioned in the articles. The attack targets the email processing stage within the application’s communication workflow. **Recommended Response** Apply patches by upgrading Laravel to versions 13.10.0 or 12.60.0 or later immediately. Monitor outbound email logs for irregularities or unauthorized message modifications. Harden email validation configurations if possible and implement network-level controls to detect and block unusual SMTP relay activity. No additional IOCs or detection signatures were provided in the sources.
Source articles (2)
- Laravel CRLF Injection Flaw Could Disrupt Outbound Email Handling — Gbhackers · 2026-06-03
A high-severity vulnerability in the Laravel framework could allow attackers to manipulate outbound email processing, potentially leading to unauthorized message delivery, data exposure, or the abuse… - Laravel CRLF Injection Vulnerability Enables an Attacker to Interfere with Outbound Email Processing — Cybersecuritynews · 2026-06-03
A high-severity CRLF injection vulnerability in the Laravel framework, tracked as CVE-2026-48019, could allow attackers to interfere with outbound email processing in affected applications. The issue…
Timeline
- 2026-06-03 — CVE-2026-48019 disclosed: A CRLF injection vulnerability in Laravel was disclosed, affecting multiple versions and allowing email processing manipulation.
- 2026-06-03 — Patch released for Laravel: Laravel released patches in versions 13.10.0 and 12.60.0 to address the CRLF injection vulnerability.
CVEs
Related entities
- Data Breach (Attack Type)
- Zero-day Exploit (Attack Type)
- CWE-78 - OS Command Injection (Cwe)
- Laravel (Platform)
- CRLF Injection (Vulnerability)
- CRLF Injection Flaw (Vulnerability)