How severe is CVE-2026-18029?

CVE-2026-18029 has a CVSS 4.0 base score of 6.3, rated medium severity.

Is CVE-2026-18029 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (11th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-18029?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2026-18029 published?

CVE-2026-18029 was published on 2026-07-28 and last updated on 2026-07-30.

CVE-2026-18029

CVE-2026-18029 is a medium-severity vulnerability with a CVSS 4.0 base score of 6.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-841.

Key facts

Severity: Medium (CVSS 4.0 base score 6.3)
EPSS exploit prediction: 0% (11th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-841
Published: 2026-07-28
Last modified: 2026-07-30

Description

Our payment integration with GiroCheckout did not properly validate payment status responses. An attacker could use a successful payment status response from one payment and supply it to the system for a different payment, gaining access to multiple valid tickets with only one payment.

Frequently asked questions

What is CVE-2026-18029?: Our payment integration with GiroCheckout did not properly validate payment status responses. An attacker could use a successful payment status response from one payment and supply it to the system for a different payment, gaining access to multiple valid tickets with only one payment.
How severe is CVE-2026-18029?: CVE-2026-18029 has a CVSS 4.0 base score of 6.3, rated medium severity.
Is CVE-2026-18029 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (11th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-18029?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2026-18029 published?: CVE-2026-18029 was published on 2026-07-28 and last updated on 2026-07-30.

References

https://pretix.eu/about/en/blog/20260728-release-2026-6-1/

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