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CVE-2026-101274medium6.9

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…

Impact

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…

Source excerpt · pretix
Applies when

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 packages

This source has no supported package-version data for matching. You can read the advisory here, but this record alone cannot power a dependency check.

Affected products

Vendor version evidence. Product records are separate from automatic dependency matching.

pretix ·

Other versions: unaffected

Version / rangeSource status
0 to before 2026.6.4affected
2026.7.0 to before 2026.7.3affected
2026.8.0 to before 2026.8.1affected
pretix version evidence

Original source 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.

References