CVE-2026-83537Network attack vector

Unauthenticated order forgery via unchecked free checkout

Published Sep 9, 2026 · Updated Sep 9, 2026

Payment verification bypass in WP Express Checkout before 2.5.0 allows remote attackers to forge paid orders through free checkout. The wpec_process_empty_payment flow accepts a coupon-driven zero-total request and marks the resulting order paid without server-side confirmation that payment completed. Unauthenticated access is sufficient; successful abuse creates a completed order and can release purchased products or download links without payment.

CVSS severity5.3
Medium
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Payment verification bypass in WP Express Checkout before 2.5.0 allows remote attackers to forge paid orders through free checkout. The wpec_process_empty_payment flow accepts a coupon-driven zero-total request and marks the resulting order paid without server-side confirmation that payment completed. Unauthenticated access is sufficient; successful abuse creates a completed order and can release purchased products or download links without payment.

The record

CVE
CVE-2026-83537
Published
Sep 9, 2026
Updated
Sep 9, 2026
Vendor
Tips and Tricks HQ
Product
WP Express Checkout
Classifications
CWE-345, T1565.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <2.5.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Tips and Tricks HQ · WP Express Checkoutversion=0 <2.5.0

Published CVSS scores

5.3WPScanCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-345Insufficient Verification of Data Authenticity
T1565.001Stored Data Manipulation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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