{"id":"CVE-2026-101274","title":"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 S…","summary":"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 S…","severity":"medium","cvss":6.9,"cvssVector":"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","cvssSource":"cna","vendor":"pretix","product":"pretix","affected":["pretix < 2026.6.4","pretix >= 2026.7.0 < 2026.7.3","pretix >= 2026.8.0 < 2026.8.1"],"published":"2026-10-28","updated":"2026-10-28","sourceUpdated":"2026-10-28T10:31:23.485Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-101274","references":[{"url":"https://pretix.eu/about/en/blog/20261028-release-2026-8-1/"}],"tags":["cve.org"],"ingestedAt":"2026-10-28T11:09:40.462Z","slug":"CVE-2026-101274","body":"## Overview\n\nWhen 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.\n\n## Affected\n\n- `pretix < 2026.6.4`\n- `pretix >= 2026.7.0 < 2026.7.3`\n- `pretix >= 2026.8.0 < 2026.8.1`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":38,"depthScoreParts":{"impact":38,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}