CVE-2026-118559 in Commerce Stripe Plugin
Summary
by MITRE • 10/30/2026
Improper Verification of Cryptographic Signature vulnerability in Drupal Commerce Stripe allows Signature Spoof. This issue affects Commerce Stripe versions: from 0.0.0 to 1.4, from 2.0.0 to 2.2.3.
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Analysis
by VulDB Data Team • 10/30/2026
The identified vulnerability represents a critical failure in the verification of cryptographic signatures within the Drupal Commerce Stripe module, specifically affecting version ranges from 0.0.0 through 1.4 and from 2.0.0 through 2.2.3. This flaw stems from an improper validation mechanism where the application fails to rigorously check the integrity and authenticity of incoming webhook payloads or API responses provided by the Stripe payment gateway. In secure implementations, every transactional event sent by a third-party service must be cryptographically signed using a secret key known only to the merchant account and the payment processor. The attacker exploits this deficiency by crafting malicious requests that mimic legitimate webhooks but contain altered data fields, such as changing the amount of money involved in a transaction or modifying the status from pending to completed without proper authorization.
From a technical perspective, the root cause is classified under CWE-347, which denotes Improper Verification of Cryptographic Signature. The module likely relies on default configuration settings or fails to implement strict signature verification algorithms such as HMAC-SHA256 before processing the incoming data. By bypassing this check, an attacker can inject arbitrary values into the system's state machine. For instance, a malicious actor could send a webhook indicating that a payment has been successfully processed for zero dollars while marking the order status as paid. This allows the fulfillment of goods or services without actual financial compensation, effectively enabling theft through transaction manipulation rather than traditional data exfiltration.
The operational impact of this vulnerability is severe and directly impacts the financial integrity of any e-commerce platform utilizing these affected versions of Commerce Stripe. Successful exploitation leads to direct monetary loss as attackers can receive products or digital goods for free by spoofing successful payment confirmations. Beyond immediate financial theft, this breach undermines trust in the payment infrastructure and may trigger fraudulent chargebacks if legitimate customers are confused by altered transaction records. Furthermore, because webhooks often drive downstream processes such as inventory updates, email notifications to customers, and analytics reporting, a signature spoof can corrupt business logic across multiple systems integrated with Drupal Commerce, leading to significant administrative overhead for reconciliation and forensic analysis.
This vulnerability aligns with the MITRE ATT&CK technique T1589.002, specifically Credential Guessing or Harvesting if used in conjunction with other attacks, but more accurately maps to T1496 Resource Hijacking where resources are consumed without proper authorization through manipulated states. It also reflects aspects of CWE-352 Cross-Site Request Forgery (CSRF) principles regarding the lack of request authenticity verification, although it is distinct as a server-side logic flaw rather than a client-side session hijack. The attack vector typically involves remote network access via HTTP/HTTPS requests directed at the webhook endpoint URL configured in Drupal Commerce Stripe settings.
To mitigate this risk, administrators must immediately upgrade to version 2.3 or later of the Commerce Stripe module where proper signature verification has been implemented and tested. For environments unable to patch immediately due to dependency constraints, a temporary workaround involves implementing an additional layer of validation at the web server level using tools like ModSecurity or Nginx Lua scripts to inspect incoming webhook payloads for expected cryptographic signatures before they reach the application logic. Additionally, ensuring that the Stripe secret key is stored securely and not exposed in client-side code is essential. Regular auditing of transaction logs against gateway records can help detect any past exploitation attempts where signature verification was bypassed.