CVE-2026-1884 in ZenTao
Summary
by MITRE • 02/05/2026
A weakness has been identified in ZenTao up to 21.7.6-85642. The impacted element is the function fetchHook of the file module/webhook/model.php of the component Webhook Module. This manipulation causes server-side request forgery. The attack may be initiated remotely. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.
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Analysis
by VulDB Data Team • 02/12/2026
The vulnerability identified in CVE-2026-1884 represents a critical server-side request forgery flaw within the ZenTao project management platform version 21.7.6-85642 and earlier releases. This weakness specifically resides within the fetchHook function located in the module/webhook/model.php file of the Webhook Module component. The vulnerability enables remote attackers to manipulate the application's webhook functionality to make unauthorized requests to arbitrary URLs, potentially compromising the system's security posture and data integrity. The presence of a publicly available exploit significantly increases the risk profile of this vulnerability, as malicious actors can readily leverage it without requiring advanced technical skills or extensive reconnaissance efforts.
The technical nature of this vulnerability aligns with CWE-918, which describes server-side request forgery vulnerabilities where applications fail to properly validate or sanitize user-supplied input that influences HTTP requests. The flaw occurs when the fetchHook function processes webhook requests without adequate validation of the target URLs or endpoints, allowing attackers to specify malicious destinations for outbound requests. This creates a dangerous attack vector where remote threat actors can potentially access internal network resources, bypass firewall restrictions, or perform unauthorized operations against systems that the vulnerable ZenTao instance can reach. The vulnerability's remote exploitability means that attackers do not require physical access or network proximity to the target system, making it particularly concerning for organizations with exposed web applications.
The operational impact of this vulnerability extends beyond simple data exfiltration or unauthorized access. Attackers could potentially use this flaw to probe internal network infrastructure, access sensitive backend services, or even establish persistent access through the exploitation of other vulnerabilities discovered during the reconnaissance phase. The webhook module is typically designed to facilitate integration with external systems and services, making it a prime target for attackers seeking to expand their attack surface. Organizations using ZenTao may experience unauthorized data transfers, potential system compromise, and increased risk of lateral movement within their network environments. The lack of vendor response to early disclosure attempts further compounds the risk, as organizations cannot rely on official patches or updates to address the vulnerability, leaving them to implement their own mitigation strategies.
The attack pattern associated with this vulnerability follows the ATT&CK framework's technique T1071.004, which covers application layer protocol: DNS, where attackers leverage legitimate application features to conduct unauthorized network communications. The exploitation process typically involves crafting malicious webhook configurations that redirect outbound requests to attacker-controlled servers, potentially enabling data exfiltration, command execution, or further reconnaissance activities. Organizations should implement network-level restrictions to prevent outbound connections to untrusted domains, monitor webhook activity for suspicious patterns, and ensure that the webhook module is properly configured with strict input validation. The absence of vendor response makes immediate remediation critical, as the vulnerability remains unpatched and actively exploitable in the wild. Security teams should consider implementing temporary network segmentation, disabling unnecessary webhook functionality, and conducting thorough network monitoring to detect any exploitation attempts targeting this specific vulnerability.