CVE-2026-11901Network attack vector

Unauthenticated payment bypass via untrusted PayPal IPN validation

Published Jul 11, 2026 · Updated Jul 11, 2026

Payment-authenticity failure in ThimPress WP Hotel Booking 2.3.1 and earlier allows remote attackers to mark bookings as paid. The web_hook_process_paypal_standard() handler trusts the request-controlled test_ipn flag to choose PayPal's sandbox endpoint, completes pending transactions, and omits receiver, currency, and transaction-uniqueness checks after VERIFIED. No site credentials or special configuration are required; a free PayPal sandbox account or replayed verified IPN can falsely complete a booking without merchant payment.

CVSS severity5.3
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Payment-authenticity failure in ThimPress WP Hotel Booking 2.3.1 and earlier allows remote attackers to mark bookings as paid. The web_hook_process_paypal_standard() handler trusts the request-controlled test_ipn flag to choose PayPal's sandbox endpoint, completes pending transactions, and omits receiver, currency, and transaction-uniqueness checks after VERIFIED. No site credentials or special configuration are required; a free PayPal sandbox account or replayed verified IPN can falsely complete a booking without merchant payment.

The record

CVE
CVE-2026-11901
Published
Jul 11, 2026
Updated
Jul 11, 2026
Vendor
Overdrive Eletrônica
Product
WP Hotel Booking
Classifications
CWE-345, T1565.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 11, 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 <=2.3.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Overdrive Eletrônica · WP Hotel Bookingversion=0 <=2.3.1

Published CVSS scores

5.3WordfenceCVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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
T1565.003Runtime Data Manipulation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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