CVE-2024-54083 in Mattermost
Summary
by MITRE • 12/16/2024
Mattermost versions 10.1.x <= 10.1.2, 10.0.x <= 10.0.2, 9.11.x <= 9.11.4, 9.5.x <= 9.5.12 fail to properly validate the type of callProps which allows a user to cause a client side (webapp and mobile) DoS to users of particular channels, by sending a specially crafted post.
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Analysis
by VulDB Data Team • 09/30/2025
The vulnerability identified as CVE-2024-54083 represents a critical client-side denial of service flaw within the Mattermost collaboration platform across multiple version ranges including 10.1.2, 10.0.2, 9.11.4, and 9.5.12. This issue stems from insufficient validation of callProps parameters during post processing, creating an exploitable condition that can be leveraged by malicious actors to disrupt normal operations for affected users. The flaw specifically impacts both web application and mobile client interfaces, demonstrating the cross-platform nature of the vulnerability. According to CWE-20, this vulnerability falls under the category of "Improper Input Validation," where the system fails to properly validate the type of data being processed. The attack vector involves a malicious user sending a specially crafted post containing malformed callProps data that triggers unexpected behavior in the client-side rendering process. This vulnerability directly violates the principle of least privilege and input sanitization that should be enforced at all application layers.
The technical exploitation of this vulnerability occurs when a malicious user crafts a post containing improperly formatted callProps data that bypasses normal validation checks. When legitimate users attempt to view the channel containing this malicious post, the client-side application encounters unexpected data types during rendering operations, causing the application to crash or become unresponsive. The DoS condition affects both web and mobile clients, indicating that the vulnerability exists in shared client-side libraries or core rendering components. This type of vulnerability aligns with ATT&CK technique T1499.004, which involves network disruption through denial of service attacks, though in this case the disruption is client-side rather than network infrastructure based. The impact extends beyond simple application crashes to potentially disrupting team collaboration workflows, as users may be unable to access critical channels containing the malicious content. The vulnerability's persistence in multiple version streams suggests a fundamental flaw in the input validation architecture rather than a localized bug fix.
The operational impact of CVE-2024-54083 extends beyond immediate service disruption to potentially compromise team productivity and collaboration effectiveness within organizations using Mattermost. When users encounter client-side crashes or unresponsiveness, they lose access to critical communication channels, potentially blocking important discussions, file sharing, and real-time collaboration activities. This vulnerability particularly affects environments where Mattermost serves as the primary communication platform, as the DoS condition can be triggered by any user with posting privileges in affected channels. The cross-platform nature of the vulnerability means that mitigation efforts must address both web and mobile client implementations, increasing the complexity of remediation. Organizations may experience cascading effects where team members cannot access shared information, leading to delays in decision-making processes and potential security incidents. According to security best practices outlined in NIST SP 800-34, this vulnerability requires immediate attention due to its potential for widespread disruption across user bases. The vulnerability also represents a significant risk to user experience and platform reliability, potentially leading to loss of confidence in the platform's stability and security posture.
Mitigation strategies for CVE-2024-54083 should focus on immediate version upgrades to patched releases, as recommended by Mattermost security advisories and the vendor's security response protocols. Organizations should implement immediate monitoring for suspicious posts containing malformed callProps data and establish temporary channel restrictions or moderation policies to prevent exploitation. Network-level mitigations including content filtering and post validation can provide additional protection while waiting for official patches. The implementation of proper input validation at both server and client levels should be enforced to prevent similar vulnerabilities from emerging in future releases. Security teams should also consider implementing automated detection mechanisms that can identify and flag potentially malicious posts before they are rendered to end users. According to OWASP Top Ten 2021, this vulnerability type falls under the category of injection flaws and improper input validation, requiring comprehensive remediation approaches that include both immediate patching and architectural improvements. Regular security assessments and penetration testing should be conducted to identify similar validation gaps in other components of the Mattermost platform. Organizations should also establish incident response procedures specifically addressing client-side DoS conditions to minimize operational impact during exploitation attempts.