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.

CVSS 3.1

8.3CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H

EPSS

0.4% chance of exploitation in the next 30 days; higher than 30% of CVEs (scores of 2026-10-25)

CWEs

CWE-306, CWE-352

Published

2026-07-07

Modified

2026-10-25

Record from

the NVD, synced 2026-10-25

Affected

• oraios-ai:serena

Packages (OSV)

References

• https://github.com/oraios/serena/commit/016ccbe1c095a3eed7967737ac1d4df2754f5d96
• https://github.com/oraios/serena/releases/tag/v1.5.2
• https://github.com/oraios/serena/security/advisories/GHSA-37h2-6p4f-mp3q

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