Sipay PrestaShop Virtual POS Module: Signature verification bypass
Summary
The Sipay Virtual POS payment module for PrestaShop online shops does not properly verify cryptographic signatures, which allows signature spoofing. Based on the CVSS vector, an unauthenticated attacker on the network can exploit this without user interaction. Public information on the exact attack path is limited, but the risk is that payments or orders can be accepted without money being received.
Affected
- PrestaShop Virtual POS Module from 26.8.1 before 26.9.1 (CNA record).
- Secondary sources state 26.8.1 through 26.9.0; treat 26.9.0 and earlier in this line as affected and check the record directly.
Fixed in
- Version 26.9.1 (reported by secondary sources; Sipay advisory not verified).
Workaround
- No vendor workaround known. Upgrading is the documented remediation.
- Interim (unconfirmed vendor guidance): identify all PrestaShop shops that run the Sipay module and check installed versions.
Exploitation
- No known exploitation in the wild; not listed in CISA KEV.
- No public proof of concept found at the time of research.
- CISA SSVC: exploitation none, automatable yes, technical impact total.
- EPSS about 0.2% (30 days).
Our recommendation
- Check whether the Sipay PrestaShop Virtual POS Module is installed and which version runs.
- Upgrade affected installations to version 26.9.1 or later as a priority.
- Review payment and order logs for anomalies, especially orders marked as paid without matching incoming payments.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- CVE record (CNA data, TR-CERT) raw.githubusercontent.com
- Turkish national CERT notice tr-26-1287 siberguvenlik.gov.tr
- cveboard.org CVE-2026-86405 cveboard.org
- ionix.io threat center CVE-2026-86405 www.ionix.io
- Strix CVE-2026-86405 www.strix.ai
- Netsecreview: upgrade Sipay Virtual POS to 26.9.1 netsecreview.com
- RedTeamWatch CVE-2026-86405 redteamwatch.com
- TheHackerWire CVE-2026-86405 www.thehackerwire.com
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 30 Oct 2026, 20:05.
Original description (NVD)
Improper verification of cryptographic signature vulnerability in Sipay Electronic Money and Payment Services Inc. PrestaShop Virtual POS Module allows Signature Spoofing by Improper Validation. This issue affects PrestaShop Virtual POS Module: from 26.8.1 before 26.9.1.
NVD references (1)
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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