CVE-2026-49471
Serena: Unauthenticated Flask dashboard on fixed port enables DNS rebinding → memory poisoning → RCE
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.
- Affected
- oraios · serena
- CVSS v3.1 GITHUB
- 8.3 HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H - EPSS
- 0.37% chance of exploitation in the next 30 days, 30th percentile
- Published
- 2026-07-07
- Updated
- 2026-07-09
Proof-of-concept exploits (1)
Security advisories
- oraios/serena/security/advisories/GHSA-37h2-6p4f-mp3q
- oraios/serena/commit/016ccbe1c095a3eed7967737ac1d4df2754f5d96