MEDIUM 6.9 NVD

CVE-2026-101274

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` req

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.

References

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

Published: 2026-10-28 · Source: NVD · Feed updated: 2026-10-28

This medium severity vulnerability with a CVSS score of 6.9 was published on 2026-10-28 via NVD.

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