Client IP Spoofing via Untrusted HTTP Headers in PayTR's PayTR Virtual Pos iFrame API (v9x) WHMCS Module

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-16272
StatePUBLISHED
AssignerTR-CERT
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-09 09:17:10 UTC
Updated2026-09-09 21:17:01 UTC
DescriptionUse of less trusted source vulnerability in PayTR Payment and Electronic Money Institution Inc. PayTR Virtual Pos iFrame API (v9x) WHMCS Module allows Exploitation of Trusted Identifiers. This issue affects PayTR Virtual Pos iFrame API (v9x) WHMCS Module: from v9.0.0 before v9.0.3.

Risk And Classification

Primary CVSS: v3.1 9.1 CRITICAL from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS: 0.001440000 probability, percentile 0.040270000 (date 2026-09-10)

Problem Types: CWE-348 | CWE-348 CWE-348 Use of less trusted source

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
3.1CNACVSS9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA PayTR Payment And Electronic Money Institution Inc. PayTR Virtual Pos IFrame API V9x WHMCS Module affected v9.0.0 v9.0.3 custom Not specified

References

ReferenceSourceLinkTags
siberguvenlik.gov.tr/guvenlik-bildirimleri/detay/tr-26-1034 [email protected] siberguvenlik.gov.tr
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Efe KIRBAŞ (en)

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