CVE-2026-88940 in knowns
Summary
by MITRE • 09/10/2026
knowns through 0.33.0 fails to validate the path query parameter in the workspace browse endpoint, allowing remote attackers to enumerate arbitrary directories on the host filesystem. Attackers can traverse the directory structure to locate project directories and identify targets for further exploitation.
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Analysis
by VulDB Data Team • 09/10/2026
The vulnerability described involves a critical input validation failure within the knowns software application, specifically affecting versions up through 0.33.0. The core technical flaw resides in the workspace browse endpoint, which is designed to allow users or applications to navigate and view directory structures associated with specific workspaces. However, the implementation fails to properly sanitize or validate the path query parameter supplied by the client during these requests. This lack of rigorous input validation creates a classic Path Traversal vulnerability, also known as Directory Traversal. By manipulating this parameter, an attacker can inject sequences such as dot-dot-slash (../) or other platform-specific traversal characters into the request payload. The server-side logic then processes these inputs without adequate checks to ensure they remain within the intended workspace boundary, effectively resolving them against the underlying host filesystem rather than restricting access to the designated application directory.
This technical deficiency allows remote attackers who have valid credentials for a knowns account or potentially unauthenticated users if authentication is not enforced on this specific endpoint to enumerate arbitrary directories on the host operating system. The operational impact of this vulnerability extends beyond simple information disclosure. By traversing up from the workspace root, an attacker can map out the entire directory structure of the server hosting the application. This reconnaissance phase enables the identification of sensitive project directories, configuration files, source code repositories, or other data stores that may contain valuable intellectual property or credentials. The ability to locate these targets significantly lowers the barrier for subsequent exploitation attempts, as it provides context about the environment and potential weak points within the broader infrastructure.
From a classification perspective, this vulnerability aligns with CWE-22: Improper Limitation of a Pathname to a Restricted Directory (Path Traversal). It represents a failure in access control mechanisms where the software does not enforce sufficient restrictions on file or directory paths that are resolved by the application. In terms of offensive security frameworks, this activity corresponds to ATT&CK technique T1083: File and Directory Discovery. Attackers utilize such techniques during the early stages of an intrusion campaign to gather information about the target environment, which is often a precursor to more destructive actions like data exfiltration or privilege escalation. The lack of validation on the query parameter means that standard web application firewall rules might not catch this if they are not specifically tuned for path traversal patterns in dynamic parameters.
Mitigation strategies must focus on implementing strict input validation and secure coding practices within the workspace browse endpoint logic. Developers should enforce a whitelist approach where only specific, expected directory names or identifiers are accepted as valid inputs rather than relying on blacklisting known malicious characters which can be easily bypassed using encoding techniques. Additionally, path canonicalization should be performed before any file system operations to resolve symbolic links and relative paths into their absolute forms, ensuring that the resulting path remains strictly within the allowed workspace root directory. Implementing chroot jails or containerized environments with restricted filesystem access can also provide a layer of defense in depth, limiting the blast radius even if traversal is attempted. Regular security code reviews and automated static analysis tools configured to detect CWE-22 patterns are essential for preventing such vulnerabilities from being introduced into future releases beyond version 0.33.