CVE-2026-56767: Maxun < 0.0.42 - Cross-Tenant IDOR in Storage and Webhook API Handlers

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-25 · updated 2026-10-25
Weakness: CWE-862

Description

Maxun before 0.0.42 contains a cross-tenant insecure direct object reference vulnerability in storage and webhook API handlers that allows authenticated users to access other users' robots and OAuth tokens. Attackers can read plaintext Google and Airtable access tokens, modify, delete, or execute other users' robots by bypassing ownership checks in API endpoints.

Affected products

getmaxun maxun: before 0.0.42 — fixed in 0.0.42

How to fix

Upgrade to a fixed version: getmaxun maxun 0.0.42. Check the vendor advisory for mitigations.

References

https://github.com/getmaxun/maxun/commit/11db0257531f1c23dec94727793c9444ee2873cf
https://github.com/getmaxun/maxun/issues/1079
https://github.com/getmaxun/maxun/pull/1088
https://www.vulncheck.com/advisories/maxun-cross-tenant-idor-in-storage-and-webhook-api-handlers

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