CVE-2025-62401 is a vulnerability discovered in the timed assignment feature of Moodle, a widely used open-source learning management system (LMS). The flaw arises from improper authorization checks that allow authenticated students to bypass the time limits set on assessments. Specifically, the vulnerability enables students to extend their allowed time beyond the configured duration, undermining the fairness and integrity of timed exams. The issue affects Moodle versions 4.1.0, 4.4.0, 4.5.0, and 5.0.0. The vulnerability does not require user interaction beyond normal usage and can be exploited remotely over the network by users with valid student credentials. The CVSS 3.1 base score is 5.4, indicating a medium severity level, with the vector indicating network attack vector, low attack complexity, privileges required, no user interaction, unchanged scope, no confidentiality impact, low integrity impact, and low availability impact. Although no public exploits have been reported, the vulnerability poses a risk to the integrity of assessments and could disrupt availability if exploited at scale. Moodle administrators should monitor for patches and consider additional controls such as enhanced logging, anomaly detection on assignment submissions, and restricting time modifications. This vulnerability highlights the importance of robust authorization checks in LMS platforms, especially for features that enforce critical academic policies.

The primary impact of CVE-2025-62401 is on the integrity and availability of timed assessments within Moodle. Students exploiting this vulnerability can gain unfair advantages by extending their exam time, potentially invalidating assessment results and undermining academic standards. This can lead to reputational damage for educational institutions and loss of trust in the LMS platform. Additionally, if exploited widely, it could disrupt the scheduling and administration of exams, affecting availability. While confidentiality is not directly impacted, the integrity breach can have downstream effects on grading fairness and certification validity. Organizations relying heavily on Moodle for high-stakes testing or certification programs are particularly at risk. The vulnerability requires authenticated access, so the threat is limited to enrolled students, but insider threat or compromised accounts could exacerbate the risk. The absence of known exploits reduces immediate risk but does not eliminate the potential for future attacks.

1. Apply official patches from Moodle as soon as they become available to address the authorization flaw in the timed assignment feature. 2. Until patches are deployed, consider disabling timed assignments or restricting their use to low-stakes assessments. 3. Implement enhanced monitoring and logging of assignment start and submission times to detect anomalies indicative of time bypass attempts. 4. Enforce strict access controls and multi-factor authentication for student accounts to reduce the risk of account compromise. 5. Conduct regular audits of assessment configurations and student activity logs to identify suspicious behavior. 6. Educate instructors and administrators about the vulnerability and encourage vigilance during exam periods. 7. Explore additional LMS plugins or external proctoring tools that provide stronger timing enforcement and tamper resistance. 8. Review and update incident response plans to include scenarios involving LMS integrity breaches. 9. Coordinate with Moodle community and security advisories to stay informed about updates and exploit developments.