{"id":"CVE-2026-101274","state":"PUBLISHED","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 authori","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.","publishedAt":"2026-10-28T10:31:23.485Z","updatedAt":"2026-10-28T10:31:23.485Z","severity":{"score":6.9,"label":"Medium","version":"4.0","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","source":"pretix"},"assigner":"pretix","products":["pretix pretix"],"affected":[{"vendor":"pretix","packageName":"pretix","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"2026.6.4","versionType":"python"},{"version":"2026.7.0","status":"affected","lessThan":"2026.7.3","versionType":"python"},{"version":"2026.8.0","status":"affected","lessThan":"2026.8.1","versionType":"python"}],"collectionURL":"https://pypi.python.org","repo":"https://github.com/pretix/pretix"}],"references":["https://pretix.eu/about/en/blog/20261028-release-2026-8-1/"],"weaknesses":[],"ingestedAt":"2026-10-29T20:10:13.529Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/101xxx/CVE-2026-101274.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-101274","state":"PUBLISHED","datePublished":"2026-10-28T10:31:23.485Z","dateUpdated":"2026-10-28T10:31:23.485Z","assignerShortName":"pretix","assignerOrgId":"655498c3-6ec5-4f0b-aea6-853b334d05a6","dateReserved":"2026-09-28T11:48:56.321Z"},"containers":{"cna":{"descriptions":[{"lang":"en","value":"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":[{"vendor":"pretix","packageName":"pretix","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"2026.6.4","versionType":"python"},{"version":"2026.7.0","status":"affected","lessThan":"2026.7.3","versionType":"python"},{"version":"2026.8.0","status":"affected","lessThan":"2026.8.1","versionType":"python"}],"collectionURL":"https://pypi.python.org","repo":"https://github.com/pretix/pretix"}],"references":[{"url":"https://pretix.eu/about/en/blog/20261028-release-2026-8-1/","tags":["vendor-advisory"]}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"PRESENT","privilegesRequired":"HIGH","userInteraction":"PASSIVE","vulnConfidentialityImpact":"HIGH","subConfidentialityImpact":"HIGH","vulnIntegrityImpact":"LOW","subIntegrityImpact":"NONE","vulnAvailabilityImpact":"NONE","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED","version":"4.0","baseSeverity":"MEDIUM","baseScore":6.9,"vectorString":"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"}}],"providerMetadata":{"shortName":"pretix","orgId":"655498c3-6ec5-4f0b-aea6-853b334d05a6","dateUpdated":"2026-10-28T10:31:23.485Z"},"credits":[{"lang":"en","value":"Ravi Gohel","type":"finder"}],"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"Vulnogram 1.0.5"}}}}}