VulnerabilityAnalyzed

CVE-2026-49471

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.

HIGH 8.3EPSS 0.37%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (0.37%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

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.

CVSS 3.1: 8.3 HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H
EPSS: 0.37% probability · 31th percentile
CISA KEV: Not listed
Weakness: CWE-306, CWE-352
Affected: oraios-ai/serena
Source: security-advisories@github.com

References

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

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.