CVE-2026-26337 is an absolute path traversal vulnerability classified under CWE-36, affecting Hyland's Alfresco Transformation Service (Enterprise edition). This vulnerability allows unauthenticated attackers to manipulate file path inputs to access arbitrary files on the server filesystem. The flaw stems from insufficient validation or sanitization of file path parameters, permitting traversal sequences (e.g., '../') that escape the intended directory boundaries. By exploiting this, attackers can read sensitive files such as configuration files, credentials, or other critical data. Additionally, the vulnerability enables server-side request forgery (SSRF), allowing attackers to induce the server to make unauthorized requests to internal or external systems, potentially leading to further exploitation or data exfiltration. The CVSS 4.0 vector indicates the attack requires no privileges, no user interaction, and can be executed remotely over the network with low complexity, but with high impact on confidentiality and limited impact on integrity. The vulnerability does not require any authentication, making it highly accessible to attackers. No patches are currently listed, and no known exploits have been observed in the wild, but the risk remains significant due to the nature of the flaw and the criticality of the affected service in enterprise content management workflows.

The vulnerability poses a significant risk to organizations relying on Hyland Alfresco Transformation Service for document processing and content management. Successful exploitation can lead to unauthorized disclosure of sensitive information, including credentials, internal configurations, or proprietary data, severely impacting confidentiality. The SSRF capability can be leveraged to pivot attacks into internal networks, potentially compromising other systems or services. This can facilitate lateral movement, data exfiltration, or further exploitation of internal resources. The lack of authentication and user interaction requirements increases the likelihood of automated attacks and broad scanning. Enterprises in sectors such as finance, healthcare, government, and manufacturing that use Alfresco services may face data breaches, regulatory non-compliance, and operational disruptions. The absence of patches means organizations must rely on compensating controls until official fixes are released, increasing exposure duration.

Organizations should immediately audit their Alfresco Transformation Service deployments to identify exposure. Until patches are available, implement strict network segmentation to isolate the service from untrusted networks and limit outbound requests to prevent SSRF exploitation. Employ web application firewalls (WAFs) with custom rules to detect and block path traversal patterns and suspicious SSRF attempts. Monitor logs for unusual file access patterns and unexpected outbound connections originating from the service. Restrict file system permissions to minimize accessible files by the service process. Conduct thorough vulnerability scanning and penetration testing focused on path traversal and SSRF vectors. Engage with Hyland for updates on patch availability and apply them promptly once released. Consider deploying runtime application self-protection (RASP) solutions to detect and block exploitation attempts in real time. Finally, educate security teams about this vulnerability to enhance incident detection and response capabilities.