Vulnerability-Lookup

CVE-2026-101274 (GCVE-0-2026-101274)

Vulnerability from cvelistv5 – Published: 2026-10-28 10:31 – Updated: 2026-10-28 10:31

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 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.

Severity

6.9 (Medium)


                        
                          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

Assigner

pretix CNA

CNA scorecard – unranked: 3 records in the last 180 days, 10 needed details

References

1 reference

URL	Tags
https://pretix.eu/about/en/blog/20261028-release-…	vendor-advisory

Impacted products

1 product

Vendor	Product	Version	CPE status
pretix		Affected: 0 , < 2026.6.4 (python) Affected: 2026.7.0 , < 2026.7.3 (python) Affected: 2026.8.0 , < 2026.8.1 (python)

Credits

Ravi Gohel

Show details on NVD website

JSON

To clipboard

{
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          "defaultStatus": "unaffected",
          "packageName": "pretix",
          "repo": "https://github.com/pretix/pretix",
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              "version": "0",
              "versionType": "python"
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              "lessThan": "2026.7.3",
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              "version": "2026.7.0",
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            },
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              "lessThan": "2026.8.1",
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              "version": "2026.8.0",
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            }
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        }
      ],
      "metrics": [
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            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 6.9,
            "baseSeverity": "MEDIUM",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "HIGH",
            "providerUrgency": "NOT_DEFINED",
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        "dateUpdated": "2026-10-28T10:31:23.485Z",
        "orgId": "655498c3-6ec5-4f0b-aea6-853b334d05a6",
        "shortName": "pretix"
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          "tags": [
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          "url": "https://pretix.eu/about/en/blog/20261028-release-2026-8-1/"
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      "source": {
        "discovery": "UNKNOWN"
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    "cveId": "CVE-2026-101274",
    "datePublished": "2026-10-28T10:31:23.485Z",
    "dateReserved": "2026-09-28T11:48:56.321Z",
    "dateUpdated": "2026-10-28T10:31:23.485Z",
    "state": "PUBLISHED"
  },
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  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-101274",
      "date": "2026-10-29",
      "epss": "0.00392",
      "percentile": "0.33294"
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    "nvd": {
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                "collectionURL": "https://pypi.python.org",
                "defaultStatus": "unaffected",
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                "repo": "https://github.com/pretix/pretix",
                "vendor": "pretix",
                "versions": [
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                    "status": "affected",
                    "version": "2026.8.0",
                    "versionType": "python"
                  }
                ]
              }
            ],
            "source": "655498c3-6ec5-4f0b-aea6-853b334d05a6"
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        ],
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            "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."
          }
        ],
        "id": "CVE-2026-101274",
        "lastModified": "2026-10-28T15:24:56.033",
        "metrics": {
          "cvssMetricV40": [
            {
              "cvssData": {
                "Automatable": "NOT_DEFINED",
                "Recovery": "NOT_DEFINED",
                "Safety": "NOT_DEFINED",
                "attackComplexity": "LOW",
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                "attackVector": "NETWORK",
                "availabilityRequirement": "NOT_DEFINED",
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                "confidentialityRequirement": "NOT_DEFINED",
                "exploitMaturity": "NOT_DEFINED",
                "integrityRequirement": "NOT_DEFINED",
                "modifiedAttackComplexity": "NOT_DEFINED",
                "modifiedAttackRequirements": "NOT_DEFINED",
                "modifiedAttackVector": "NOT_DEFINED",
                "modifiedPrivilegesRequired": "NOT_DEFINED",
                "modifiedSubAvailabilityImpact": "NOT_DEFINED",
                "modifiedSubConfidentialityImpact": "NOT_DEFINED",
                "modifiedSubIntegrityImpact": "NOT_DEFINED",
                "modifiedUserInteraction": "NOT_DEFINED",
                "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
                "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
                "modifiedVulnIntegrityImpact": "NOT_DEFINED",
                "privilegesRequired": "HIGH",
                "providerUrgency": "NOT_DEFINED",
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                "subConfidentialityImpact": "HIGH",
                "subIntegrityImpact": "NONE",
                "userInteraction": "PASSIVE",
                "valueDensity": "NOT_DEFINED",
                "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
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                "vulnConfidentialityImpact": "HIGH",
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                "vulnerabilityResponseEffort": "NOT_DEFINED"
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              "type": "Secondary"
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        "published": "2026-10-28T11:17:13.577",
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            "source": "655498c3-6ec5-4f0b-aea6-853b334d05a6",
            "url": "https://pretix.eu/about/en/blog/20261028-release-2026-8-1/"
          }
        ],
        "sourceIdentifier": "655498c3-6ec5-4f0b-aea6-853b334d05a6",
        "vulnStatus": "Deferred"
      }
    }
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}

GHSA-JGPC-MVF3-4RPJ

Vulnerability from github – Published: 2026-10-28 12:30 – Updated: 2026-10-28 12:30

Details

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.

Severity

6.9 (Medium)


                  
                    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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-101274"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-28T11:17:13Z",
    "severity": "MODERATE"
  },
  "details": "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.",
  "id": "GHSA-jgpc-mvf3-4rpj",
  "modified": "2026-10-28T12:30:36Z",
  "published": "2026-10-28T12:30:36Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-101274"
    },
    {
      "type": "WEB",
      "url": "https://pretix.eu/about/en/blog/20261028-release-2026-8-1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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