CVE-2026-67329: @better-auth/stripe before 1.6.21 Authorization Bypass via Organization Subscription

Severity: high (CVSS 7.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-01 · updated 2026-10-23
Weakness: CWE-639

Description

@better-auth/stripe versions >= 1.4.11 and < 1.6.21, and >= 1.7.0-beta.0 and < 1.7.0-beta.10, contain an authorization bypass in organization subscription actions. The middleware validates the organization ID taken from the request query string against the authorizeReference callback, but the handler reads the organization ID only from the request body and falls back to the caller's active organization from their session. When these differ, an authenticated member of multiple organizations can perform subscription actions (cancel, change plan, restore, billing portal access) against an organization they belong to but should not manage, and can access another organization's billing details including payment methods, invoices, and subscription state.

Affected products

better-auth stripe: from 1.4.11 before 1.6.21; from 1.7.0-beta.0 before 1.7.0-beta.10 — fixed in 1.6.21, 1.7.0-beta.10

How to fix

Upgrade to a fixed version: better-auth stripe 1.6.21, 1.7.0-beta.10. Check the vendor advisory for mitigations.

References

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