Tencent WeKnora is an LLM-powered framework designed for deep document understanding and semantic retrieval. Prior to version 0.2.5, it contains a critical command injection vulnerability identified as CVE-2026-22688 (CWE-77). This vulnerability arises from improper neutralization of special elements in the stdio_config.command and stdio_config.args parameters, which are injected into the MCP stdio settings. Authenticated users can exploit this flaw by injecting arbitrary commands that the server executes as subprocesses, effectively allowing remote code execution with the privileges of the WeKnora service. The vulnerability does not require user interaction but does require authentication, making it a significant risk in environments where user credentials may be compromised or insider threats exist. The CVSS v3.1 score of 10 reflects the vulnerability's critical impact on confidentiality, integrity, and availability, as successful exploitation can lead to full system compromise, data exfiltration, or service disruption. No known exploits are currently reported in the wild, but the severity and ease of exploitation make it a high-priority patch. The vendor has addressed this issue in version 0.2.5, and users are strongly advised to upgrade. Given WeKnora's role in processing sensitive documents and semantic data, exploitation could have severe consequences for affected organizations.

For European organizations, exploitation of CVE-2026-22688 could lead to complete system compromise of WeKnora servers, resulting in unauthorized access to sensitive document data, manipulation or deletion of critical information, and disruption of document processing services. This could impact sectors relying on advanced document understanding such as legal, financial, healthcare, and government agencies. The ability to execute arbitrary commands on the server could also facilitate lateral movement within networks, enabling attackers to escalate privileges and access other critical infrastructure. The confidentiality breach risks exposure of personal data protected under GDPR, potentially leading to regulatory penalties and reputational damage. The integrity and availability impacts could disrupt business operations and delay critical decision-making processes dependent on semantic retrieval capabilities. The requirement for authentication reduces the attack surface but does not eliminate risk, especially in environments with weak credential management or insider threats. The lack of known exploits in the wild provides a window for proactive mitigation before widespread attacks occur.

1. Immediately upgrade Tencent WeKnora to version 0.2.5 or later where the vulnerability is patched. 2. Restrict access to WeKnora management interfaces and APIs to trusted, authenticated users only, employing strong authentication mechanisms such as multi-factor authentication (MFA). 3. Implement strict input validation and sanitization on any user-supplied parameters related to command or argument configurations, even beyond the vendor patch. 4. Monitor server logs and subprocess execution patterns for unusual or unauthorized commands indicative of exploitation attempts. 5. Employ network segmentation to isolate WeKnora servers from critical infrastructure to limit lateral movement in case of compromise. 6. Conduct regular security audits and penetration testing focused on command injection and privilege escalation vectors. 7. Educate administrators and users about the risks of credential compromise and enforce strong password policies. 8. Maintain an incident response plan tailored to rapid containment and remediation of command injection incidents.