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.
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History
Fri, 10 Jul 2026 10:15:00 +0000
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Thu, 09 Jul 2026 14:30:00 +0000
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Tue, 07 Jul 2026 21:00:00 +0000
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| Description | 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. | |
| Title | Serena: Unauthenticated Flask dashboard on fixed port enables DNS rebinding → memory poisoning → RCE | |
| Weaknesses | CWE-306 CWE-352 |
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cvssV3_1
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Status: PUBLISHED
Assigner: GitHub_M
Published: 2026-07-07T20:50:50.545Z
Updated: 2026-07-09T13:55:44.505Z
Reserved: 2026-05-30T04:17:43.094Z
Link: CVE-2026-49471
Updated: 2026-07-09T13:55:41.181Z
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