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CVE-2026-72535 – Unauthenticated Stripe Billing Portal Access (Missing Authentication) – Chaskiq (al

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Summary

CVE-2026-72535 is a missing authentication vulnerability (CWE-306) in Chaskiq, an open-source customer messaging/support platform, affecting all versions up to and including commit 46dfdd1. The flaw resides in the stripeCustomerPortal GraphQL mutation, which fails to enforce any authentication or authorization checks before generating a Stripe Billing Portal session. As a result, an unauthenticated remote attacker can mint a valid Stripe Billing Portal session for any tenant, gaining unauthorized access to that tenant’s subscription and billing data. The issue carries a CVSS v3.1 base score of 8.2 (High).

Technical details

  • Root cause: The stripeCustomerPortal GraphQL mutation in Chaskiq creates a Stripe Billing Portal session linked to a tenant’s Stripe customer account without first verifying that the requester is authenticated or authorized to act on behalf of that tenant.
  • Trigger conditions: An attacker only needs to invoke the stripeCustomerPortal GraphQL mutation against a Chaskiq instance, typically by specifying or guessing a target tenant identifier; no valid session, API key, or credentials are required.
  • Attack vector: Network-based (AV:N), low attack complexity (AC:L), no privileges required (PR:N), no user interaction required (UI:N) — the mutation can be exploited directly over the network via the exposed GraphQL API.
  • Impact: Successful exploitation grants the attacker a legitimate Stripe Billing Portal session for an arbitrary tenant, exposing that tenant’s subscription and billing information (confidentiality impact: Low) and potentially allowing changes to subscription/payment settings (integrity impact: High), with a secondary availability impact (Low) to billing operations. Because the mutation works across tenants, the vulnerability is multi-tenant in scope — it is not limited to the attacker’s own account.

Affected software

  • Chaskiq (all versions/commits up to and including commit 46dfdd1)

Severity

  • CVSS v3.1 Base Score: 8.2 (High)
  • Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L
  • CWE: CWE-306 – Missing Authentication for Critical Function

Mitigation and recommended actions

  • Immediate: At the time of publication, no official patched release or fixed commit had been identified by the vendor beyond the vulnerable commit 46dfdd1. Security teams should monitor the Chaskiq GitHub repository for an official fix and upgrade to a patched version as soon as one is released.
  • If no patch is available:
    • Restrict or disable public/unauthenticated access to the Chaskiq GraphQL API endpoint (e.g., via a reverse proxy, WAF rule, or network ACL) until a fix is available.
    • Add authentication/authorization enforcement in front of the stripeCustomerPortal mutation (e.g., via an API gateway) to block requests lacking valid tenant-scoped credentials.
    • Monitor Stripe Billing Portal session creation logs for anomalous or unexpected sessions generated for tenants that did not initiate the request.
    • Restrict Stripe API key/webhook permissions where feasible to limit the blast radius of unauthorized portal session creation.

References

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