CVE-2026-74244 in OpenShift Update Service
Summary
by MITRE • 08/15/2026
A flaw was found in Red Hat Quay's Stripe billing webhook handler. This vulnerability allows an unauthenticated attacker to forge billing events by sending crafted JSON requests to the `/webhooks/stripe` endpoint without validating the Stripe-Signature header. Successful exploitation can lead to the unauthorized resetting of a namespace's build quota to its maximum and trigger unsolicited billing emails to namespace administrators.
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Analysis
by VulDB Data Team • 08/15/2026
This vulnerability resides within Red Hat Quay's Stripe billing webhook handler, representing a critical security flaw that undermines the integrity of the platform's billing system. The issue stems from insufficient input validation mechanisms that fail to authenticate incoming requests through the Stripe-Signature header, which serves as the primary means of verifying request origin and integrity in Stripe's webhook architecture. This weakness allows malicious actors to craft and send arbitrary JSON payloads to the /webhooks/stripe endpoint without proper authentication, effectively bypassing the security controls designed to protect namespace billing configurations.
The technical implementation of this vulnerability demonstrates a classic lack of input validation and authentication checks that aligns with CWE-287, which addresses improper authentication issues in software systems. When an attacker successfully exploits this flaw, they can manipulate the billing system by sending forged webhook events that appear legitimate to the Quay platform. The specific impact involves unauthorized modification of namespace build quotas, resetting them to their maximum allowed values, which represents a significant operational disruption to both the affected namespaces and the overall platform resource management. This manipulation occurs because the system accepts the forged events without verifying their authenticity through Stripe's signature validation process.
The operational implications of this vulnerability extend beyond simple quota manipulation to encompass broader security and administrative concerns. Namespace administrators receive unsolicited billing emails that could confuse them about their actual billing status, potentially leading to operational disruptions and security misconfigurations. This attack vector could be particularly dangerous in environments where multiple organizations share the same Quay instance, as unauthorized actors might target specific namespaces to cause service degradation or resource exhaustion. The vulnerability also introduces potential financial risks for users who may receive unexpected billing notifications that do not correspond to legitimate transactions.
Security practitioners should consider this weakness in relation to ATT&CK technique T1566.002 which covers phishing with malicious attachments and links, as similar principles apply to webhook-based attacks where attackers craft convincing payloads to bypass security controls. The mitigation strategy involves implementing proper signature validation for all incoming Stripe webhooks by verifying the Stripe-Signature header against the expected signature computed using the webhook signing secret. Organizations should also establish monitoring mechanisms to detect unauthorized quota resets and implement rate limiting on billing-related endpoints to prevent abuse. Additionally, regular security assessments of webhook handlers should be conducted to ensure that authentication mechanisms remain robust against evolving attack patterns in payment processing integrations.