Paymenter up to 1.5.6 Upgrade Upgrade.php doUpgrade race condition

Summaryinfo

A vulnerability labeled as problematic has been found in Paymenter up to 1.5.6. This affects the function app/Livewire/Services/Upgrade.php::doUpgrade of the file app/Livewire/Services/Upgrade.php of the component Upgrade. Such manipulation leads to race condition. This vulnerability is referenced as CVE-2026-71537. It is possible to launch the attack remotely. No exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Paymenter up to 1.5.6. It has been rated as problematic. Affected by this issue is the function app/Livewire/Services/Upgrade.php::doUpgrade of the file app/Livewire/Services/Upgrade.php of the component Upgrade. The manipulation with an unknown input leads to a race condition vulnerability. Using CWE to declare the problem leads to CWE-362. The product contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently. Impacted is integrity. CVE summarizes:

Paymenter is a free and open-source webshop solution for management of hosting services. Prior to 1.5.7, app/Livewire/Services/Upgrade.php::doUpgrade() relies on Service::upgradable to check for a pending service upgrade and later executes $credit->increment('amount', abs($price)) without DB::transaction or lockForUpdate() spanning those operations. An authenticated customer with an active downgradable service can submit concurrent downgrade requests that each observe no pending upgrade, create separate upgrade records, and increment the same account credit balance, producing multiple spendable refunds for one downgrade. This issue is fixed in version 1.5.7.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-71537 since 08/06/2026. The exploitation is known to be easy. The attack may be launched remotely. Technical details are known, but there is no available exploit.

By approaching the search of inurl:app/Livewire/Services/Upgrade.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 1.5.7 eliminates this vulnerability.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Name

• Paymenter

Version

• 1.5.0
• 1.5.1
• 1.5.2
• 1.5.3
• 1.5.4
• 1.5.5
• 1.5.6

Website

• Product: https://github.com/Paymenter/Paymenter/

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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