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CVE-2026-16037— Callback Authentication Bypass via Timing Attack in PayTR's PayTR Virtual Pos iFrame API (v9x) WHMCS Module

Quick assessment

Affected
PayTR Payment and Electronic Money Institution Inc. PayTR Virtual Pos iFrame API (v9x) WHMCS Module
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

PayTR 支付及电子货币机构（PayTR Payment and Electronic Money Institution Inc.）在其 PayTR 虚拟 POS iFrame API（v9x）WHMCS 模块中存在可观察的时序差异（Timing Discrepancy）漏洞，该漏洞允许攻击者进行黑盒逆向工程。 影响范围： 产品：PayTR 虚拟 POS iFrame API（v9x）WHMCS 模块 版本：v9.0.0 至 v9.0.3 之前（即 v9.0.0 < version < v9.0.3） 修复版本

CVSS 7.5 · High

Possible ATT&CK Techniques 1 AI

T1527

Affected Version Matrix 1

VendorProduct Version RangeStatus
PayTR Payment and Electronic Money Institution Inc. PayTR Virtual Pos iFrame API (v9x) WHMCS Module v9.0.0< v9.0.3 affected
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I. Basic Information for CVE-2026-16037

Vulnerability Information
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Vulnerability Title
Callback Authentication Bypass via Timing Attack in PayTR's PayTR Virtual Pos iFrame API (v9x) WHMCS Module
Source: CVE Program / CVE List V5
Vulnerability Description
Observable timing discrepancy vulnerability in PayTR Payment and Electronic Money Institution Inc. PayTR Virtual Pos iFrame API (v9x) WHMCS Module allows Black Box Reverse Engineering. This issue affects PayTR Virtual Pos iFrame API (v9x) WHMCS Module: from v9.0.0 before v9.0.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过时间差异性导致的信息暴露
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
PayTR Payment and Electronic Money Institution Inc. PayTR Virtual Pos iFrame API (v9x) WHMCS Module v9.0.0 ~ v9.0.3 -

II. Public POCs for CVE-2026-16037

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III. Intelligence Information for CVE-2026-16037

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Vendor Advisories for CVE-2026-16037 (1)

IV. Related Vulnerabilities

Same product: PayTR Virtual Pos iFrame API (v9x) WHMCS Module
Same vendor: PayTR Payment and Electronic Money Institution Inc.
Same weakness: CWE-208

V. Comments for CVE-2026-16037

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