CVE-2026-55807 in Drupal
Summary
by MITRE • 07/11/2026
Server-Side Request Forgery (SSRF) vulnerability in Drupal Drupal core allows Server Side Request Forgery. This issue affects Drupal core versions: from 0.0.0 to 10.5.12, from 10.6.0 to 10.6.11, from 11.2.0 to 11.2.14, from 11.3.0 to 11.3.12, from 0.0.0 to 11.0.*, from 0.0.0 to 11.1.*.
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Analysis
by VulDB Data Team • 07/11/2026
Server-Side Request Forgery vulnerabilities represent a critical class of security flaws that allow attackers to manipulate server-side applications into making unintended requests to internal or external resources. This particular vulnerability affects the Drupal core framework and demonstrates how seemingly innocuous input processing can be exploited to bypass security controls and access restricted systems. The vulnerability exists across multiple version ranges, indicating it has been present for an extended period and affects both major release lines of the platform.
The technical flaw stems from insufficient validation of user-provided input that is subsequently used in server-side requests without proper sanitization or restriction mechanisms. When Drupal processes certain inputs through its core functionality, it fails to adequately verify the destination of these requests, allowing malicious actors to redirect traffic to internal network services that should otherwise be inaccessible to external users. This creates a pathway for attackers to probe internal systems, access sensitive data, or even escalate privileges within the affected environment.
The operational impact of this vulnerability extends far beyond simple information disclosure. Attackers can leverage SSRF to bypass firewalls and security controls by making requests through the vulnerable Drupal server. This allows them to access internal services such as databases, administrative interfaces, or other systems that are normally protected from external access. The vulnerability can be exploited to perform reconnaissance activities, extract sensitive information, or even facilitate further attacks such as privilege escalation or data exfiltration. Organizations running affected Drupal versions face significant risk of unauthorized access to their internal infrastructure and potential data breaches.
Mitigation strategies for this SSRF vulnerability require immediate action from system administrators and security teams. The primary recommendation involves applying the latest security patches released by the Drupal project, which address the input validation flaws in the core framework. Additionally, organizations should implement network-level restrictions using firewalls and access control lists to prevent outbound requests to internal services from web servers. Input sanitization measures should be enhanced throughout the application, particularly in areas where external resource requests are processed. Security monitoring should be strengthened to detect unusual outbound traffic patterns that might indicate exploitation attempts.
This vulnerability aligns with CWE-918, which specifically addresses server-side request forgery flaws in software applications, and maps to ATT&CK technique T1190 for exploiting weaknesses in web applications. The attack surface is particularly concerning given Drupal's widespread adoption across various organizations including government agencies, financial institutions, and enterprise environments. The extended version ranges indicate that this vulnerability has persisted across multiple releases, suggesting either inadequate testing or delayed patch development processes within the project. Organizations should conduct comprehensive security assessments to identify any potential exploitation attempts and ensure proper network segmentation to limit the impact of successful attacks. Regular security updates and monitoring protocols are essential for maintaining protection against evolving threats targeting web application frameworks.