CVE-2026-53976 in OpenChamber
Summary
by MITRE • 08/06/2026
OpenChamber 1.11.7 contains a path traversal vulnerability in the file-serving endpoints /api/fs/read, /api/fs/stat, and /api/fs/raw that allows unauthenticated remote attackers to read arbitrary files by supplying the allowOutsideWorkspace=true query parameter alongside an absolute path, bypassing the workspace boundary check in resolveReadPathFromContext. Attackers can exploit the vacuous isPathWithinRoot guard to read sensitive files such as the JWT signing secret, SSH private keys, API credentials, and environment variables, enabling full authentication bypass by forging session cookies on password-protected deployments.
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Analysis
by VulDB Data Team • 08/06/2026
The OpenChamber 1.11.7 vulnerability represents a critical path traversal flaw that undermines fundamental security boundaries within the application's file system access controls. This vulnerability exists in three core endpoints designed for file reading operations: /api/fs/read, /api/fs/stat, and /api/fs/raw. The flaw manifests when attackers exploit the allowOutsideWorkspace=true query parameter in conjunction with absolute paths, effectively circumventing the intended workspace boundary restrictions that should contain file access within predefined directories. The root cause lies in the resolveReadPathFromContext function which fails to properly validate path resolution when the allowOutsideWorkspace flag is enabled, creating a dangerous condition where absolute paths can traverse beyond the designated workspace boundaries.
The technical implementation of this vulnerability follows a well-established pattern that aligns with common path traversal attack vectors and maps directly to CWE-22 - "Improper Limitation of a Pathname to a Restricted Directory." The flaw operates through what security researchers term a "vacuous guard" condition where the isPathWithinRoot validation becomes ineffective when combined with the allowOutsideWorkspace parameter. This creates a scenario where the application's intended security controls become counterproductive rather than protective, allowing attackers to craft malicious requests that bypass all file system access restrictions.
The operational impact of this vulnerability extends far beyond simple unauthorized file reading capabilities and represents a complete breakdown of authentication and authorization mechanisms within affected deployments. Attackers who successfully exploit this vulnerability gain access to sensitive system files including JWT signing secrets, SSH private keys, API credentials, and environment variables that typically contain critical authentication tokens and configuration data. The ability to extract these confidential materials enables attackers to forge session cookies and achieve full authentication bypass on password-protected systems, effectively granting them administrative access without requiring legitimate credentials. This vulnerability essentially provides attackers with a backdoor that can be used to completely compromise the security posture of affected OpenChamber deployments.
The exploitation of this vulnerability aligns with several tactics described in the MITRE ATT&CK framework, particularly those related to credential access and privilege escalation. The attack chain follows a pattern consistent with T1566 - "Phishing" through initial access, followed by T1078 - "Valid Accounts" for authentication bypass, and culminates in T1528 - "Steal Application Access Token" when attackers extract session tokens and JWT secrets. Organizations running OpenChamber 1.11.7 deployments face significant risk of lateral movement and persistent access once this vulnerability is exploited, as the extracted credentials can be used to access other systems within the network that may share the same authentication infrastructure.
Mitigation strategies for this vulnerability should prioritize immediate patching of affected OpenChamber installations to version 1.11.8 or later where the path traversal protection has been properly implemented. Network segmentation and firewall rules should be enforced to restrict direct access to the vulnerable endpoints from untrusted networks, while implementing proper input validation at all levels of the application stack. Organizations should also conduct comprehensive security audits to identify any other applications or systems that may be vulnerable to similar path traversal attacks, particularly those that allow external file access with configurable workspace boundaries. Regular monitoring of system logs for suspicious file access patterns and implementing automated security scanning tools can help detect exploitation attempts before they result in successful credential theft or unauthorized access to sensitive system resources.