CVE-2026-18029Network attack vector

Ticket fraud via cross-payment status replay

Published Jul 28, 2026 · Updated Jul 28, 2026

Improper payment workflow validation in pretix-girosolution before 1.0.1 allows remote attackers to obtain multiple tickets with one payment. The GiroCheckout integration accepts a successful payment status response without verifying that it belongs to the payment being completed. Exploitation requires a valid response from one successful payment and its reuse for another payment; the result is unauthorized valid tickets without data disclosure.

CVSS severity6.3
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper payment workflow validation in pretix-girosolution before 1.0.1 allows remote attackers to obtain multiple tickets with one payment. The GiroCheckout integration accepts a successful payment status response without verifying that it belongs to the payment being completed. Exploitation requires a valid response from one successful payment and its reuse for another payment; the result is unauthorized valid tickets without data disclosure.

The record

CVE
CVE-2026-18029
Published
Jul 28, 2026
Updated
Jul 28, 2026
Vendor
pretix GmbH
Product
pretix-girosolution
Classifications
CWE-841, T1657
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 28, 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 <1.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

pretix GmbH · pretix-girosolutionversion=0 <1.0.1

Published CVSS scores

6.3National Vulnerability DatabaseCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA: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-841Improper Enforcement of Behavioral Workflow
T1657Financial Theft

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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