CVE-2026-18029
Received Received - Intake

Payment Status Validation Bypass in GiroCheckout

Publication date: 2026-07-28

Last updated on: 2026-07-28

Assigner: rami.io

Description
Our payment integration with GiroCheckout did not properly validate payment status responses. An attacker could use a successful payment status response from one payment and supply it to the system for a different payment, gaining access to multiple valid tickets with only one payment.

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Meta Information

Published
2026-07-28
Last Modified
2026-07-28
Generated
2026-07-28
AI Q&A
2026-07-28
EPSS Evaluated
N/A
NVD
CVE-2026-18029
EUVD
EUVD-2026-49752

Affected Vendors & Products

Currently, no data is known.

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-841 The product supports a session in which more than one behavior must be performed by an actor, but it does not properly ensure that the actor performs the behaviors in the required sequence.

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Executive Summary

This vulnerability involves a payment integration flaw with GiroCheckout where payment status responses were not properly validated. An attacker could exploit this by using a valid payment status from one transaction and applying it to another payment, allowing them to gain access to multiple valid tickets without making additional payments.

Detection Guidance

This vulnerability involves improper validation of payment status responses in GiroCheckout integration. To detect it, review payment logs for mismatches between payment IDs and status responses. Check for duplicate tickets issued for a single payment or unexpected payment confirmations without corresponding transactions.

Impact Analysis

If you are a user of the affected payment system, this vulnerability could allow attackers to obtain tickets for free or at a reduced cost by reusing payment confirmations from other transactions. This could lead to financial losses for the service provider and potential disruptions in ticket availability.

Compliance Impact

This vulnerability could lead to unauthorized access to valid tickets through improper payment validation, potentially violating data integrity and access control principles required by GDPR and HIPAA. Unauthorized access to payment-related data may also result in non-compliance with these regulations.

Mitigation Strategies

Immediately update the GiroCheckout integration to properly validate payment status responses against payment IDs. Implement strict checks to ensure status responses match the original payment request. Review and revoke any duplicate tickets issued due to this issue.

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