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CVE-2026-86405 – Signature Spoofing / Improper Cryptographic Signature Verification – Sipay Virtual

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Summary

CVE-2026-86405 is an improper cryptographic signature verification vulnerability (CWE-347) in the Sipay Virtual POS module for PrestaShop, published by Sipay Electronic Money and Payment Services Inc. It allows signature spoofing through improper validation. It is rated Critical (CVSS 9.8) and is remotely exploitable over the network without authentication or user interaction.

Technical details

  • Root cause: The module does not properly verify a cryptographic signature (CWE-347). The CVE record maps this to CAPEC-475, Signature Spoofing by Improper Validation.
  • Trigger conditions: The CVSS vector indicates no privileges and no user interaction are required, and attack complexity is low.
  • Attack vector: Network. A remote, unauthenticated attacker can submit data with a spoofed signature that the module fails to validate correctly.
  • Impact: The CVSS vector rates confidentiality, integrity and availability impact as High. The public CVE record does not describe specific exploitation outcomes, such as forged payment confirmations. No public proof-of-concept was found.

Affected software

  • Sipay Virtual POS Module for PrestaShop, versions 26.8.1 up to but not including 26.9.1 (the CVE description text says 26.8.1 through 26.9.0).

Severity

  • CVSS v3.1 base score: 9.8 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: Upgrade the Sipay Virtual POS PrestaShop module to version 26.9.1 or later. The affected range ends before 26.9.1.
  • Identify all PrestaShop storefronts that run the Sipay module and check their installed module versions.
  • If you cannot patch immediately: No vendor workaround was found in public sources. Consider disabling the Sipay payment module until you upgrade. Also review recent orders and payment records for mismatches against Sipay’s own transaction records.
  • Review the Turkish National Cyber Security Authority notice TR-26-1287 for further guidance. The CVE record credits the finder as Yasin SUER.

References

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