CVE-2024-43425

The vulnerability in the Moodle learning management system arises from insufficient restrictions within the calculated question types feature, which can lead to remote code execution (RCE). This flaw allows an attacker, who has the capability to add or update questions within the system, to inject malicious code that can be executed on the server. The underlying issue stems from the way user input is processed and validated, which fails to adequately sanitize inputs before they are executed. This oversight creates a pathway for attackers to manipulate the application and execute arbitrary commands, potentially compromising the integrity and confidentiality of the system.

Attack vectors for this vulnerability primarily involve social engineering tactics or insider threats, where an attacker gains access to an account with permissions to create or modify questions. Once inside, the attacker can craft a specially designed question that includes malicious code. When the question is processed by the Moodle application, the code is executed on the server, leading to a full compromise of the system. This scenario highlights the critical need for strict access controls and user permissions, as even a single compromised account can lead to devastating consequences for the entire platform.

The real-world impact of this vulnerability can be significant, particularly for educational institutions and organizations that rely on Moodle for e-learning and training. A successful exploitation could result in unauthorized access to sensitive data, including student records, personal information, and proprietary content. The potential for data breaches not only poses legal and compliance risks but can also damage the institution's reputation and erode trust among users. Furthermore, the financial implications of remediation efforts, legal liabilities, and potential fines can be substantial, making this vulnerability a pressing concern for organizations utilizing Moodle.

To detect and mitigate this vulnerability, organizations should implement a multi-layered security approach. Regular security assessments and code reviews can help identify and remediate weaknesses in the application. Additionally, employing web application firewalls (WAF) can provide an additional layer of protection by filtering out malicious requests before they reach the application. It is also crucial to enforce strict user permissions and limit the ability to add or modify questions to trusted users only. Educating users about the risks associated with social engineering and the importance of maintaining strong passwords can further reduce the likelihood of exploitation.

In conclusion, the vulnerability within the Moodle platform poses a serious risk of remote code execution due to inadequate input validation in calculated question types. The potential for exploitation through compromised accounts highlights the necessity for stringent access controls and user education. Organizations must adopt proactive detection and mitigation strategies to safeguard their systems against this threat, ensuring the integrity and security of their educational environments. By addressing these vulnerabilities promptly, institutions can protect their users and maintain the trust essential for successful e-learning initiatives.

CSURFACE threat intelligence has detected a marked escalation in exploitation attempts targeting CVE-2024-43425, with new proof-of-concept exploits emerging across multiple public repositories. This development indicates growing attacker interest and increasing accessibility of exploitation tools, which lowers the barrier for threat actors to leverage this vulnerability. Our telemetry shows a sharp rise in detection activity, underscoring that exploitation is moving beyond theoretical proof into active reconnaissance and potential compromise phases. Although the EPSS score remains high and stable, the proliferation of publicly available exploit code elevates the risk profile, particularly for environments where user privileges allow question modification. Defenders must recognize that the threat landscape is evolving rapidly, with adversaries now equipped to conduct authenticated remote code execution with greater ease. This shift amplifies the urgency for vigilant monitoring of privileged accounts and reinforces the criticality of layered security controls to mitigate exploitation attempts.

Update 2 — July 19, 2026

CSURFACE threat intelligence has identified a marked escalation in detection activity related to CVE-2024-43425, reflecting a doubling in observed exploitation attempts within monitored environments. This increase coincides with the continued emergence and refinement of publicly available proof-of-concept exploits, which now demonstrate greater reliability and ease of use for adversaries possessing the necessary privileges to modify Moodle question content. The heightened detection trend underscores an expanding attacker focus on leveraging authenticated remote code execution vectors, intensifying the operational risk for affected organizations. Although the EPSS score remains stable, the qualitative surge in exploitation attempts signals an elevated threat posture that demands heightened vigilance. This evolving landscape amplifies the potential impact of successful intrusions, as threat actors can more readily execute arbitrary code remotely, potentially leading to broader system compromise and data exposure.

Update 3 — August 03, 2026

CSURFACE threat intelligence has identified a marked escalation in exploitation attempts targeting the Moodle vulnerability CVE-2024-43425. Our telemetry indicates a doubling in detection frequency, reflecting increased adversary interest in leveraging authenticated remote code execution within calculated question types. While the EPSS score remains largely stable, this surge in activity signals a growing operational focus on this attack vector, potentially driven by the availability of multiple new proof-of-concept exploits circulating on public repositories. This development elevates the threat landscape by increasing the likelihood of successful intrusions, especially in environments where question modification privileges are granted. Defenders should recognize that the expanding exploitation attempts amplify the risk of unauthorized code execution, which could facilitate broader system compromise and data exfiltration. Consequently, the threat level associated with CVE-2024-43425 has intensified, warranting heightened monitoring and response readiness.