CVE-2026-66488Network attack vector

Unauthenticated payment bypass via forged unbound callbacks

Published Jul 29, 2026 · Updated Jul 29, 2026

Improper authorization in Balbooa Gridbox 1.0.0 through 2.20.1 allows remote attackers to bypass payment via crafted callbacks. The payment callback logic accepts a forgeable signature when no shared secret is configured and fails to bind a verified transaction to its intended order. An internet-reachable store using an affected gateway configuration lets unauthenticated remote attackers mark an order paid without a valid payment.

CVSS severity5.3
Medium
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authorization in Balbooa Gridbox 1.0.0 through 2.20.1 allows remote attackers to bypass payment via crafted callbacks. The payment callback logic accepts a forgeable signature when no shared secret is configured and fails to bind a verified transaction to its intended order. An internet-reachable store using an affected gateway configuration lets unauthenticated remote attackers mark an order paid without a valid payment.

The record

CVE
CVE-2026-66488
Published
Jul 29, 2026
Updated
Jul 29, 2026
Vendor
Balbooa
Product
Gridbox
Classifications
CWE-285, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 29, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 29, 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=1.0.0-2.20.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Balbooa · Gridboxversion=1.0.0-2.20.1

Published CVSS scores

5.3CISA-ADPCVSS: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-285Improper Authorization
T1190Exploit Public-Facing Application

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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