high · CVSS v3 7.5

CVE-2026-84918

Drupal Monobank payment API improperly verifies cryptographic signatures, enabling attackers to spoof transaction signatures. The flaw exist

Overview

Drupal Monobank payment API improperly verifies cryptographic signatures, enabling attackers to spoof transaction signatures. The flaw exists in all releases up to 1.0.3, potentially allowing unauthorized fund transfers. Defenders should verify signature logic and apply patches promptly.

Description

Improper Verification of Cryptographic Signature vulnerability in Drupal Monobank payment API allows Signature Spoof. This issue affects Monobank payment API versions: from 0.0.0 to 1.0.3.

Impact

The vulnerability compromises confidentiality, integrity, and availability of payment transactions. Attackers could forge signatures to redirect funds, causing financial loss and eroding customer trust. Defenders must monitor for anomalous payment activity and enforce strict signature validation.

Remediation

Update Monobank Payment API to version 1.0.4 or later where signature verification is fixed. If patch unavailable, replace the signature verification routine with a proven cryptographic library, enforce TLS, and add transaction logging. Additionally, perform a security audit of all payment endpoints.

Risk context

High severity (CVSS 7.5) with no EPSS data; the issue remains critical until patched. Immediate attention is warranted for systems using affected API versions.

Affected products

  • Monobank Payment API

Scores

Severity
high
CVSS v2
5
CVSS v3
7.5
CVSS v4
—
EPSS
—

cryptographic signature payment Drupal Monobank high-severity API

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