{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-101274", "assignerOrgId": "655498c3-6ec5-4f0b-aea6-853b334d05a6", "state": "PUBLISHED", "assignerShortName": "pretix", "dateReserved": "2026-09-28T11:48:56.321Z", "datePublished": "2026-10-28T10:31:23.485Z", "dateUpdated": "2026-10-28T10:31:23.485Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "655498c3-6ec5-4f0b-aea6-853b334d05a6", "shortName": "pretix", "dateUpdated": "2026-10-28T10:31:23.485Z"}, "affected": [{"vendor": "pretix", "collectionURL": "https://pypi.python.org", "packageName": "pretix", "repo": "https://github.com/pretix/pretix", "versions": [{"status": "affected", "version": "0", "lessThan": "2026.6.4", "versionType": "python"}, {"status": "affected", "version": "2026.7.0", "lessThan": "2026.7.3", "versionType": "python"}, {"status": "affected", "version": "2026.8.0", "lessThan": "2026.8.1", "versionType": "python"}], "defaultStatus": "unaffected"}], "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.", "supportingMedia": [{"type": "text/html", "base64": false, "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."}]}], "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"}}], "credits": [{"lang": "en", "value": "Ravi Gohel", "type": "finder"}], "source": {"discovery": "UNKNOWN"}, "x_generator": {"engine": "Vulnogram 1.0.5"}}}}

{}

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{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": null}], "enrichment": {"confidence": 85.0, "confidence_source": "inferred", "scores": [{"score": 85.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "product": "pretix", "vendor": "pretix"}], "created": "2026-10-28T11:30:11.911993+00:00", "title": "Identity Provider Response Type Validation Bypass in SSO Leading to Token Acquisition", "updated": "2026-10-28T11:45:09.775323+00:00", "vendors": ["pretix", "pretix$PRODUCT$pretix"], "weaknesses": ["CWE-285", "CWE-20"]}