CVE-2026-15966 in MOVEit Transfer
Summary
by MITRE • 07/24/2026
Permissive cross-domain security policy with untrusted domains vulnerability in Progress MOVEit Transfer.
This issue affects MOVEit Transfer: before 2025.1.5, from 2026.0.0 before 2026.0.3.
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Analysis
by VulDB Data Team • 07/24/2026
The vulnerability in Progress MOVEit Transfer represents a critical permissive cross-domain security policy that allows untrusted domains to establish connections and potentially execute malicious activities within the system. This flaw stems from an overly lenient configuration that fails to properly validate domain origins, creating an attack surface where external entities can manipulate the transfer process without proper authentication or authorization. The vulnerability affects specific version ranges including releases prior to 2025.1.5 and versions between 2026.0.0 and 2026.0.2, indicating a persistent issue that required multiple patch releases to address effectively.
Technical exploitation of this vulnerability occurs through cross-domain request manipulation where malicious actors can craft requests that bypass normal security boundaries. The flaw essentially allows unauthorized domains to participate in the file transfer process, potentially enabling man-in-the-middle attacks, data exfiltration, or injection of malicious content into transfer operations. This type of vulnerability aligns with CWE-614, which specifically addresses insecure cross-domain policies and improper access control mechanisms that allow external entities to interact with internal systems without proper validation.
The operational impact of this vulnerability extends beyond simple data security concerns to encompass complete system integrity compromise. Attackers can leverage the permissive policy to redirect transfers to malicious endpoints, intercept sensitive data during transit, or manipulate transfer parameters to execute unauthorized operations. The implications are particularly severe in enterprise environments where MOVEit Transfer typically handles confidential business information, customer data, and proprietary files that require strict security controls. This vulnerability essentially undermines the fundamental security model of the application by allowing external domains to participate in internal transfer processes without proper verification.
Organizations affected by this vulnerability should implement immediate mitigations including applying the patched versions 2025.1.5 and 2026.0.3 or later, which contain proper domain validation mechanisms. Security administrators must review and restrict cross-domain policies to only allow trusted domains that have been explicitly authorized for transfer operations. Network segmentation and monitoring should be enhanced to detect unusual cross-domain activity patterns. The remediation process should also include comprehensive security audits of all domain configurations and access controls. Additionally, implementing proper intrusion detection systems and logging mechanisms will help identify potential exploitation attempts and provide evidence for forensic analysis should an attack occur.
From a compliance perspective, this vulnerability creates significant risks for organizations subject to data protection regulations such as gdpr, hipaa, or pci dss standards, where unauthorized data access or processing could result in substantial penalties. The flaw represents a direct violation of security principle of least privilege and proper access control enforcement that are fundamental requirements in cybersecurity frameworks like nist csf and iso 27001. Organizations must also consider the broader implications for their security posture and conduct thorough vulnerability assessments to identify similar permissive policies in other applications and systems within their infrastructure.