CVE-2026-49291

HIGH 8.1

mcp-memory-service: OAuth read-only clients can write and delete memories through MCP tools/call

CVSS Score

8.1

EPSS Score

0.0%

EPSS Percentile

0th

mcp-memory-service is a semantic memory layer for AI applications. Prior to version 10.65.3, the HTTP MCP JSON-RPC endpoint at `/mcp` requires only OAuth `read` scope for all requests, then dispatches `tools/call` directly to handlers that include mutating tools. A read-only OAuth client can call `store_memory` and `delete_memory` through MCP even though the corresponding REST endpoints require `write` scope. Version 10.65.3 patches the issue.

CWE	CWE-862
Vendor	doobidoo
Product	mcp-memory-service
Published	Jun 19, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

High

Affected Versions

doobidoo / mcp-memory-service

< 10.65.3

References

NVD ↗ CVE.org ↗ EPSS Data ↗

web.archive.org: https://web.archive.org/web/20260508112116/https://github.com/doobidoo/mcp-memory-service/ github.com: https://github.com/doobidoo/mcp-memory-service/security/advisories/GHSA-2r68-g678-7qr3 pypi.org: https://pypi.org/project/mcp-memory-service/10.65.3