CVE-2025-23921 is a critical vulnerability that allows for unrestricted upload of files with dangerous types in the sh1zen Multi Uploader for Gravity Forms. This vulnerability facilitates the upload of a web shell to a web server, significantly increasing the risk of unauthorized access and control over affected systems. The severity of this issue is underscored by a CVSS score of 9, categorizing it as critical, which warrants urgent attention from organizations utilizing this plugin.
With an attack vector of NETWORK and a high complexity requirement, the vulnerability necessitates no privileges or user interaction, making it particularly dangerous. Organizations should be aware that the risk to their systems includes potential data breaches, loss of integrity, and service disruptions. The vulnerability affects versions of the Multi Uploader for Gravity Forms from n/a up to and including 1.1.3, and immediate remediation is crucial.
Currently, there are no known exploits available for this vulnerability, but organizations should not be complacent. The absence of known public exploits does not reduce the urgency for patching, as the potential for exploitation remains high given the nature of the vulnerability. Organizations should prioritize patching immediately to safeguard against possible attacks.
As this vulnerability is classified as deferred, organizations must stay vigilant and monitor updates from the vendor regarding available patches and remediation options. Implementing strong file upload controls and restricting file types can help mitigate the risk until a patch is available.
Vulnerability Details
The CVE-2025-23921 vulnerability is characterized as an unrestricted upload of file with dangerous type, which allows an attacker to upload arbitrary files, including web shells, to the server. The CVSS score of 9 indicates the critical nature of the vulnerability, and the associated CWE-434 classification highlights the weakness related to file upload vulnerabilities.
Technical Analysis
The root cause of this vulnerability lies in the lack of proper validation of uploaded files, allowing potentially malicious files to be executed on the server. The attack vector is through the network, and the complexity of the attack is rated as high due to the requirement for specific conditions to be met for successful exploitation.
No privileges are required for an attacker to exploit this vulnerability, and no user interaction is necessary, which significantly lowers the barrier for exploitation. The impacts on confidentiality, integrity, and availability are all rated as high, indicating a severe risk to organizations that utilize this component.
Risk & Impact Analysis
The real-world risk of CVE-2025-23921 is significant. Organizations using the affected Multi Uploader for Gravity Forms may find their web servers compromised, potentially leading to unauthorized access, data theft, or service disruption. The blast radius of this vulnerability is broad, impacting any organization that relies on this plugin without proper security measures.
Given the critical CVSS score and the potential for exploitation, organizations must prioritize patching this vulnerability immediately. The urgency is underscored by the potential for attackers to leverage this vulnerability for malicious purposes, including deploying malware or exfiltrating sensitive data.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The vulnerability impacts all versions of the Multi Uploader for Gravity Forms up to and including version 1.1.3. Organizations using this plugin should ensure they update to the latest version as soon as it becomes available to mitigate the risks associated with this vulnerability. If version information is unavailable, assume all versions prior to the vendor patch are affected.
Mitigation & Remediation
Organizations should take immediate action to remediate this vulnerability. This includes applying any available patches or updates for the Multi Uploader for Gravity Forms. In the absence of a patch, organizations can implement workarounds such as restricting file upload types and enhancing server configuration to prevent the execution of potentially harmful files.
Furthermore, organizations should consider engaging in penetration testing to assess their systems for similar vulnerabilities and validate the effectiveness of their security measures.
Detection Guidance
To detect potential exploitation of this vulnerability, organizations should monitor logs for unusual file uploads, particularly any files with executable extensions. Behavioral anomalies, such as unexpected web shell activity, should also be scrutinized. Network signatures that identify unauthorized access attempts can aid in early detection of exploitation attempts.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2025-23921 lies in the ongoing risks associated with file upload vulnerabilities. They represent a recurring theme in application security, emphasizing the need for robust file handling practices. Security teams should remain vigilant against similar vulnerabilities across different components and ensure that their security posture evolves to address these threats.
Organizations can benefit from reviewing their approach to application security testing, including services such as application security assessment, to identify and remediate vulnerabilities before they can be exploited.
In addition, incorporating practices from the penetration testing methodology can provide a structured approach for identifying and addressing similar vulnerabilities across all applications.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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