Credit double-spend via transactionless row locking
Published Jul 20, 2026 · Updated Jul 20, 2026
Race condition in Paymenter before 1.5.5 allows remote authenticated users to pay multiple invoices with one valid credit balance. The payWithCredit implementation in app/Livewire/Invoices/Show.php calls lockForUpdate() without a database transaction, so concurrent requests read and approve against the same balance. Exploitation requires an authenticated account, a valid credit balance, multiple pending invoices, and precisely concurrent requests; successful payments provision services or digital goods beyond the paid balance.
Summary
What happened
Race condition in Paymenter before 1.5.5 allows remote authenticated users to pay multiple invoices with one valid credit balance. The payWithCredit implementation in app/Livewire/Invoices/Show.php calls lockForUpdate() without a database transaction, so concurrent requests read and approve against the same balance. Exploitation requires an authenticated account, a valid credit balance, multiple pending invoices, and precisely concurrent requests; successful payments provision services or digital goods beyond the paid balance.
The record
- CVE
- CVE-2026-55219
- Published
- Jul 20, 2026
- Updated
- Jul 20, 2026
- Vendor
- Paymenter
- Product
- Paymenter
- Classifications
- CWE-362, T1565.001
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 20, 2026CVE publishedPublication date reported by the CVE source.
- Jul 20, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 1.5.5
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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