CVSS 3.1
Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)
Атакува се
Време до експлоатация
Атакува се по мрежата, без особени условия, без вход и след действие от потребителя.
- Експлоатация: има публичен пример за експлоатация
- Атаката не може да се автоматизира
Описание
Оригинално описание
RMCP is an official Rust SDK for the Model Context Protocol. Prior to 2.0.0, the rmcp crate's OAuth implementation in crates/rmcp/src/transport/auth.rs omits the RFC 9728 resource field from ResourceServerMetadata and allows discover_oauth_server_via_resource_metadata to use protected-resource metadata without confirming that the returned resource identifier exactly matches the configured MCP server. A malicious MCP server can publish metadata for a different legitimate MCP resource and its authorization server, causing a victim who connects and completes the authorization flow to obtain a legitimate access token that the client subsequently sends to the malicious server. The attacker can capture the token and impersonate the victim against the legitimate MCP resource within the token's granted scopes. This issue is fixed in version 2.0.0.
Засегнати продукти
- modelcontextprotocol rust-sdk: < 2.0.0
Вид слабост
История
- 16 септември 2026 Публикувано
Други уязвимости в modelcontextprotocol rust-sdk
Първоизточници
- https://www.cve.org/CVERecord?id=CVE-2026-63127
- https://nvd.nist.gov/vuln/detail/CVE-2026-63127
- https://github.com/modelcontextprotocol/rust-sdk/security/advisories/GHSA-33f5-2c5q-wgwj
- https://github.com/modelcontextprotocol/rust-sdk/pull/937
- https://github.com/modelcontextprotocol/rust-sdk/commit/c1a8b29ff2cc45e7820b900dae42cbb4958089ec
- https://github.com/modelcontextprotocol/rust-sdk/releases/tag/rmcp-v2.0.0