CVE-2026-77321

Published: Set 24, 2026 Last Modified: Set 25, 2026

ExploitDB:

Other exploit source:

Google Dorks:

MEDIUM 4,3

Source: [email protected]

Attack Vector: network

Attack Complexity: low

Privileges Required: low

User Interaction: none

Scope: unchanged

Confidentiality: low

Integrity: none

Availability: none

Description

AI Translation Available

TREK is a collaborative travel planner. Prior to 3.3.0, the get_trip_summary tool in server/src/mcp/tools/trips.ts is registered for scoped OAuth MCP tokens without requiring trips:read and returns core trip summary data regardless of the delegated scopes. A token granted only an unrelated capability, such as weather:read, can receive trip metadata, member email addresses from server/src/services/tripService.ts, itinerary days, and accommodations for every trip accessible to the token's user. Cross-user trip authorization remains enforced, but the missing scope check defeats the consented least-privilege boundary and exposes trip content and third-party contact information to an MCP client that was not authorized to read it. This issue is fixed in version 3.3.0.

200

Exposure of Sensitive Information to an Unauthorized Actor

Draft

Abstraction: Class Structure: Simple

Common Consequences

Security Scopes Affected:

Confidentiality

Potential Impacts:

Read Application Data

Applicable Platforms

Technologies: Not Technology-Specific, Web Based, Mobile

Likelihood of Exploit: High

View CWE Details

284

Improper Access Control

Incomplete

Abstraction: Pillar Structure: Simple

Common Consequences

Security Scopes Affected:

Other

Potential Impacts:

Varies By Context

Applicable Platforms

Technologies: Not Technology-Specific, ICS/OT, Web Based

View CWE Details

862

Missing Authorization

Incomplete

Abstraction: Class Structure: Simple

Common Consequences

Security Scopes Affected:

Confidentiality Integrity Access Control Availability

Potential Impacts:

Read Application Data Read Files Or Directories Modify Application Data Modify Files Or Directories Gain Privileges Or Assume Identity Bypass Protection Mechanism Dos: Crash, Exit, Or Restart Dos: Resource Consumption (Cpu) Dos: Resource Consumption (Memory) Dos: Resource Consumption (Other)