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CVE-2026-49471

8.3 · HIGH

Serena is a powerful MCP toolkit for coding that provides semantic retrieval and editing capabilities.

Published Jul 7, 2026CWE-306EPSS 0.37%

Overview

CVE-2026-49471 is a high-severity vulnerability. It was published on July 7, 2026 and has a CVSS 3.1 base score of 8.3 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.3, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/oraios/serena/commit/016ccbe1c095a3eed7967737ac1d4df2754f5d96GitHubgithub.com/oraios/serena/releases/tag/v1.5.2GitHubgithub.com/oraios/serena/security/advisories/GHSA-37h2-6p4f-mp3q

How CyberStrike helps

Frequently asked questions

What is CVE-2026-49471?

CVE-2026-49471 is a high-severity vulnerability. It was published on July 7, 2026 and has a CVSS 3.1 base score of 8.3 (HIGH).

How severe is CVE-2026-49471?

This vulnerability has a CVSS 3.1 base score of 8.3, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-49471?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-49471?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-49471 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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