CVE-2026-103820 in C2PA Tool
Summary
by MITRE • 10/14/2026
CAI Content Credential is affected by an Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability that could result in an arbitrary file system write. An attacker could leverage this vulnerability to write to unauthorized files or directories outside of intended restrictions. Exploitation of this issue requires user interaction in that a victim must extract a maliciously crafted file.
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Analysis
by VulDB Data Team • 10/14/2026
The CAI Content Credential software contains a critical security flaw classified as an Improper Limitation of a Pathname to a Restricted Directory, commonly known as path traversal or directory traversal. This vulnerability stems from insufficient validation and sanitization of user-supplied input when processing filenames within the application's file handling mechanisms. Specifically, the system fails to adequately restrict access to designated directories, allowing malicious actors to manipulate relative paths using standard navigation sequences such as dot-dot-slash (../) or their URL-encoded equivalents. By injecting these sequences into filename fields during the extraction process, an attacker can break out of the intended sandboxed environment and write data to arbitrary locations on the host file system. This behavior violates fundamental security principles regarding input validation and secure path resolution, aligning with CWE-22 in the Common Weakness Enumeration taxonomy which specifically addresses improper limitation of a pathname to a restricted directory.
The operational impact of this vulnerability is severe due to its potential for arbitrary file system writes. An attacker who successfully exploits this flaw can overwrite critical configuration files, inject malicious scripts into executable directories, or corrupt existing data structures outside the application's control scope. This capability effectively grants the attacker a degree of persistence and control over the underlying operating system environment, depending on the privileges under which the CAI Content Credential process is running. If the application executes with elevated permissions, such as root or administrator rights, the consequences can escalate to full system compromise, enabling further lateral movement within a network or installation of persistent backdoors. The ability to write arbitrary files disrupts the integrity and availability of the host system, potentially leading to service outages or unauthorized data exfiltration if combined with other vulnerabilities.
Exploitation of this path traversal vulnerability requires user interaction, as it necessitates that a victim extracts a maliciously crafted file containing the injected path sequences. This dependency on social engineering or targeted delivery means that while the technical flaw is significant, its practical exploitation relies heavily on convincing users to open specific files generated by an adversary. The attacker typically constructs a compromised archive or document where internal filenames contain the traversal payloads designed to escape the extraction directory upon decompression. Once extracted, the application processes these malformed paths without proper checks, resulting in the unintended write operation at the target location. This interaction model highlights the importance of user awareness training alongside technical controls, as human error remains a primary vector for initiating such attacks.
To mitigate this vulnerability and prevent similar path traversal issues, developers must implement rigorous input validation strategies that strictly sanitize all file paths before processing. Recommended practices include canonicalizing file paths to resolve any relative references and ensuring they remain within the allowed directory boundaries using absolute path comparisons rather than string matching alone. Additionally, employing allow-listing for permitted characters in filenames can reduce the attack surface by rejecting inputs containing special navigation sequences or non-standard symbols. From a defensive standpoint, organizations should enforce least-privilege principles by running application processes with minimal necessary permissions, thereby limiting the potential damage of any successful exploitation. Regular security audits and static code analysis tools configured to detect CWE-22 patterns can also help identify such flaws early in the development lifecycle. Furthermore, keeping CAI Content Credential updated to versions that include patches for this issue is essential for maintaining system integrity against known threats associated with ATT&CK techniques involving file manipulation and persistence mechanisms.