TI-2026-81925 Aliases CVE-2026-101273 GHSA-c455-p7g3-cw6m

Authorization bypass in pretix lets attackers read gift card secrets

LOW 24CWE-639Published 2026-10-28 · Updated 2026-11-05

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Security bypass
Confidentiality · integrity · availability: None · Low · None
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-639.

Summary

pretix versions from 0 before 2026.6.4, from 2026.7.0 before 2026.7.3, and from 2026.8.0 before 2026.8.1 are affected. API endpoints did not check the auto-incremented internal ID of a gift card when creating order payments, which is CWE-639 (authorization bypass through a user-controlled key). An attacker with low privileges can create a payment that references a gift card from another organizer and obtain its secret. Triggering a refund on that payment then increases the gift card's value.

Written with Claude Haiku 5.5 from the sources below · 2026-11-05

Description from the CNA

Some of our API endpoints allowed to create order payments referencing a gift card by using the auto-incremented internal ID. This ID was not checked and allowed creating payments that reference gift cards from different organizers and thereby obtaining their secret. The gift card is not charged in this case, but by then triggering a refund on the payment, one can increase the value of the gift card.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00336 27th percentileScored 2026-11-07

Fix Fixed pretix (pretix): 2026.6.4, 2026.7.3, 2026.8.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
pretix	pretix	before 2026.6.4; 2026.7.0 to before 2026.7.3; 2026.8.0 to before 2026.8.1	2026.6.4, 2026.7.3, 2026.8.1	Patch available	CNA

pretix Vendorpretix Affected before 2026.6.4; 2026.7.0 to before 2026.7.3; 2026.8.0 to before 2026.8.1 Fixed in 2026.6.4, 2026.7.3, 2026.8.1 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:pretix:pretix::::::::	—	—	pretix

cpe:2.3:a:pretix:pretix:*:*:*:*:*:*:*:* Versions — — ·pretix

Remediation

Upgrade pretix to 2026.6.4, 2026.7.3 or 2026.8.1, matching your release branch.

Written with Claude Haiku 5.5 from the sources below · 2026-11-05

Fix · CNA pretix (pretix) Fixed in 2026.6.4, 2026.7.3, 2026.8.1

Timeline

2026-10-28 Threatist record created from CVE-2026-101273
2026-10-28 Alias added: GHSA-c455-p7g3-cw6m
2026-11-05 Weakness changed · CISA ADP
2026-11-05 CISA SSVC decision points changed

References

Advisory 1

https://pretix.eu/about/en/blog/20261028-release-2026-8-1/

TI-2024-18268 pretix before 2024.1.1 mishandles file validation. CVSS 3.1CRITICAL 9.8
TI-2026-11524 SSRF with API key leak in pretix-oppwa CVSS 4.0CRITICAL 9.0
TI-2026-41416 Cross-site scripting in pretix CVSS 4.0HIGH 8.8
TI-2026-11523 Session takeover vulnerability CVSS 4.0HIGH 7.7
TI-2026-02082 Unsafe variable evaluation in email templates CVSS 4.0HIGH 7.5
TI-2026-02081 Unsafe variable evaluation in email templates CVSS 4.0HIGH 7.5

See all 38 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences