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PayTR Module for WHMCS CVE-2026-16025: Input Data Manipulation

PayTR Virtual POS iFrame module for WHMCS is affected by CVE-2026-16025. Improper validation of specified quantity in input vulnerability in PayTR Payment and Electronic Money Institution Inc. PayTR Virtual Pos iFrame API (v9x) WHMCS Module allows Input Data Manipulation. This issue. Affected versions: v9.0.0 before v9.0.3. Fixed in v9.0.3. CVSS base score: 7.5.

High 7.5 CVSS
WHMCS AlmaLinux 8 AlmaLinux 9 Debian 11 Debian 12 Ubuntu 20.04 Ubuntu 22.04

Affected Versions

v9.0.0 before v9.0.3

Patched Version

v9.0.3

Default Update CMD

# Replace the PayTR module files with v9.0.3 from the vendor

Fix Commands

All supported operating systems

# Replace the PayTR Virtual POS iFrame module with v9.0.3 from the vendor
# WHMCS → Setup → Payment Gateways → confirm the module version

What this means under a SharedLicense license

Your SharedLicense WHMCS license itself is not affected — this is a vulnerability in PayTR Virtual POS iFrame module for WHMCS, not in licensing. Licenses continue to work during and after the update; there is no need to re-issue or re-activate anything. If you resell under your own brand, patch client servers too — unpatched installs put your reputation at risk, not your license.

Improper validation of specified quantity in input vulnerability in PayTR Payment and Electronic Money Institution Inc. PayTR Virtual Pos iFrame API (v9x) WHMCS Module allows Input Data Manipulation.

This issue affects PayTR Virtual Pos iFrame API (v9x) WHMCS Module: from v9.0.0 before v9.0.3.

Reference: https://nvd.nist.gov/vuln/detail/CVE-2026-16025

Frequently Asked Questions

What is CVE-2026-16025?
Improper validation of specified quantity in input vulnerability in PayTR Payment and Electronic Money Institution Inc. PayTR Virtual Pos iFrame API (v9x) WHMCS Module allows Input Data Manipulation. This issue. Affected versions: v9.0.0 before v9.0.3. Fixed in v9.0.3.
Is CVE-2026-16025 being exploited in the wild?
No confirmed public exploitation has been announced at the time of writing. With a CVSS base score of 7.5, apply the update on your next maintenance window and watch the vendor advisory for changes.
How do I fix CVE-2026-16025?
Replace the PayTR Virtual POS iFrame module with v9.0.3 from the vendor. WHMCS → Setup → Payment Gateways → confirm the module version.
Which versions are affected?
Affected: v9.0.0 before v9.0.3. Update to v9.0.3 or later.

References

Security Advisories

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