Vulnerability · Published Oct 28, 2026 · Assigned by pretix

CVE-2026-101274

Medium 6.9

In plain English

A medium-severity missing authentication in pretix from pretix. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 31% of all known vulnerabilities).

Severity (CVSS 4.0)6.9Medium

Exploit odds (30 days)0.4%top 68.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

When pretix is used as the identity provider in a Single-Sign-On (SSO) setup for customer accounts, the system did not properly validate the `response_type` requested in an authorization request against the configured grant type of the SSO client. This means that if an SSO client was configured to only allow the `code` response type, which requires knowledge of the client secret to use and would wrongfully send a response type like `id_token`, it would receive back a valid token. Exploiting this requires the attacker to run JavaScript on the page specified by `redirect_uri`, which must be from a list specified in the client configuration.

Affected products (as reported)

Vendor	Product	Versions
pretix	pretix	0 – before 2026.6.42026.7.0 – before 2026.7.32026.8.0 – before 2026.8.1

Weakness: CWE-306 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:H/VI:L/VA:N/SC:H/SI:N/SA:N

References

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