CVE-2026-77321Public exploitNetwork attack vectorHinoki check available

Trip data disclosure via missing MCP scope check

Published Sep 24, 2026 · Updated Sep 24, 2026

Authorization bypass in Liketrek TREK before 3.3.0 allows remote authenticated users to read trip data through an under-scoped MCP token. The get_trip_summary handler in server/src/mcp/tools/trips.ts spreads core trip data into its response without requiring trips:read, including member email addresses, itinerary days, and accommodations. A valid scoped OAuth token and access to the requested trip are required; cross-user authorization remains enforced, and the consequence is limited to disclosure.

CVSS severity4.3
Medium
EPSS probability0.20%
Next 30 days · Oct 18, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Authorization bypass in Liketrek TREK before 3.3.0 allows remote authenticated users to read trip data through an under-scoped MCP token. The get_trip_summary handler in server/src/mcp/tools/trips.ts spreads core trip data into its response without requiring trips:read, including member email addresses, itinerary days, and accommodations. A valid scoped OAuth token and access to the requested trip are required; cross-user authorization remains enforced, and the consequence is limited to disclosure.

The record

CVE
CVE-2026-77321
Published
Sep 24, 2026
Updated
Sep 24, 2026
Vendor
Liketrek
Product
TREK
Classifications
CWE-284, CWE-862, CWE-200, T1213
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 3.3.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Liketrek · TREKversion=< 3.3.0

Published CVSS scores

4.3GitHub Security AdvisoryCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-284Improper Access Control
CWE-862Missing Authorization
CWE-200Exposure of Sensitive Information to an Unauthorized Actor
T1213Data from Information Repositories

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

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Your stack

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