CVE-2026-4515 is a code injection vulnerability identified in the Foundation Agents MetaGPT software, specifically affecting versions 0.8.0 and 0.8.1. The vulnerability resides in the code_generate function located in the metagpt/ext/aflow/scripts/operator.py file. This function improperly handles input, allowing an attacker to inject arbitrary code remotely without requiring authentication or user interaction. The vulnerability was publicly disclosed on March 21, 2026, with a CVSS 4.0 base score of 5.3, indicating medium severity. The attack vector is network-based with low attack complexity, and no privileges or user interaction are needed, making exploitation feasible in exposed environments. Despite public disclosure, no confirmed exploits have been detected in the wild, and the vendor has not issued a patch or responded to disclosure attempts. The vulnerability could allow attackers to execute arbitrary code on affected systems, potentially compromising confidentiality, integrity, and availability of the host. The lack of vendor response increases risk as no official remediation is currently available, necessitating proactive defensive measures by users. The affected product, MetaGPT, is a tool used in AI agent frameworks, which may be integrated into various development and operational environments, increasing the scope of potential impact.

The impact of CVE-2026-4515 is significant for organizations utilizing Foundation Agents MetaGPT versions 0.8.0 and 0.8.1. Successful exploitation enables remote code execution, which can lead to full system compromise, data theft, unauthorized access, and disruption of services. Since the vulnerability requires no authentication or user interaction, attackers can target exposed instances directly over the network, increasing the risk of automated or widespread attacks. The medium CVSS score reflects moderate but tangible risks to confidentiality, integrity, and availability. Organizations relying on MetaGPT for AI development or automation may face operational disruptions and potential intellectual property loss. The absence of vendor patches and public exploit code increases the urgency for organizations to implement compensating controls. Additionally, the vulnerability could be leveraged as a foothold in multi-stage attacks, especially in environments where MetaGPT is integrated with other critical systems. The overall impact is heightened by the vendor's lack of response, leaving users without official remediation guidance.

1. Immediate mitigation should focus on isolating MetaGPT instances from untrusted networks to reduce exposure to remote attacks. 2. Conduct manual code audits and apply strict input validation and sanitization in the code_generate function or any user-controllable inputs to prevent code injection. 3. Employ runtime application self-protection (RASP) or endpoint detection and response (EDR) tools to monitor for suspicious code execution behaviors. 4. Restrict permissions and run MetaGPT processes with the least privilege necessary to limit potential damage from exploitation. 5. Implement network-level controls such as firewalls and intrusion prevention systems (IPS) to detect and block exploit attempts targeting this vulnerability. 6. Monitor public sources for any emerging patches or vendor updates and apply them promptly once available. 7. Develop and rehearse incident response plans specific to code injection and remote code execution scenarios involving MetaGPT. 8. Consider temporary suspension or replacement of MetaGPT in critical environments until a secure version is released. 9. Engage with the security community and vendors for potential unofficial patches or workarounds. 10. Maintain comprehensive logging and alerting to detect anomalous activities related to MetaGPT usage.