CVE-2026-49471

Serena is a powerful MCP toolkit for coding that provides semantic retrieval and editing capabilities. Prior to v1.5.2, Serena's built-in web dashboard exposes an unauthenticated Flask API on a fixed, predictable port, with no authentication, no CSRF protection, and no Host header validation. A DNS rebinding attack allows a malicious webpage to reach this API from any browser and write arbitrary content to the agent's persistent memory store, which the agent reads and acts on autonomously. Combined with execute_shell_command using shell=True, this creates a remote code execution chain requiring only that the victim visit a malicious webpage while Serena is running. This issue is fixed in version v1.5.2.

• CWE-306
• CWE-352

• https://github.com/oraios/serena/commit/016ccbe1c095a3eed7967737ac1d4df2754f5d96Patch
• https://github.com/oraios/serena/releases/tag/v1.5.2Release Notes
• https://github.com/oraios/serena/security/advisories/GHSA-37h2-6p4f-mp3qExploit, Third Party Advisory

Published

Jul 7, 2026

Last Modified

Jul 20, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
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