{
    "document": {
        "category": "csaf_base",
        "csaf_version": "2.0",
        "distribution": {
            "tlp": {
                "label": "WHITE"
            }
        },
        "lang": "en",
        "notes": [
            {
                "category": "legal_disclaimer",
                "text": "The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this portal to enhance access to its information and vulnerabilities. The use of this information is subject to the following terms and conditions:\n\nThe vulnerabilities disclosed in this portal are gathered by NCSC-NL from a variety of open sources, which the user can retrieve from other platforms. NCSC-NL makes every reasonable effort to ensure that the content of this portal is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or real-time keeping up-to-date. NCSC-NL does not control nor guarantee the accuracy, relevance, timeliness or completeness of information obtained from these external sources. The vulnerabilities disclosed in this portal are intended solely for the convenience of professional parties to take appropriate measures to manage the risks posed to the cybersecurity. No rights can be derived from the information provided therein.\n\nNCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of the vulnerabilities disclosed in this portal. This includes damage resulting from the inaccuracy of incompleteness of the information contained in it.\nThe information on this page is subject to Dutch law. All disputes related to or arising from the use of this portal regarding the disclosure of vulnerabilities will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings."
            }
        ],
        "publisher": {
            "category": "coordinator",
            "contact_details": "cert@ncsc.nl",
            "name": "National Cyber Security Centre",
            "namespace": "https://www.ncsc.nl/"
        },
        "title": "CVE-2026-3531",
        "tracking": {
            "current_release_date": "2026-04-01T18:27:29.120952Z",
            "generator": {
                "date": "2026-02-17T15:00:00Z",
                "engine": {
                    "name": "V.E.L.M.A",
                    "version": "1.7"
                }
            },
            "id": "CVE-2026-3531",
            "initial_release_date": "2026-03-05T00:30:42.207396Z",
            "revision_history": [
                {
                    "date": "2026-03-05T00:30:42.207396Z",
                    "number": "1",
                    "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| Products created (1).| References created (1)."
                },
                {
                    "date": "2026-03-05T00:30:47.364084Z",
                    "number": "2",
                    "summary": "NCSC Score created."
                },
                {
                    "date": "2026-03-05T11:06:11.258822Z",
                    "number": "3",
                    "summary": "Source connected.| CVE status created. (valid)| Products connected (1).| References created (10)."
                },
                {
                    "date": "2026-03-05T11:06:13.810937Z",
                    "number": "4",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-26T20:38:34.046005Z",
                    "number": "5",
                    "summary": "Source created.| CVE status created. (valid)| Description created for source.| Products created (1).| References created (1).| CWES updated (1)."
                },
                {
                    "date": "2026-03-26T20:38:38.282207Z",
                    "number": "6",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-26T21:28:13.889805Z",
                    "number": "7",
                    "summary": "Source created.| CVE status created. (valid)| Description created for source.| References created (1).| CWES updated (1)."
                },
                {
                    "date": "2026-03-26T21:28:18.592879Z",
                    "number": "8",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-27T20:55:43.674868Z",
                    "number": "9",
                    "summary": "Source connected.| CVE status created. (valid)| EPSS created."
                },
                {
                    "date": "2026-03-27T20:55:55.209966Z",
                    "number": "10",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-30T15:26:27.379453Z",
                    "number": "11",
                    "summary": "CVSS created."
                },
                {
                    "date": "2026-03-30T15:26:32.952526Z",
                    "number": "12",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-30T15:39:38.155876Z",
                    "number": "13",
                    "summary": "CVSS created.| Unknown change."
                },
                {
                    "date": "2026-03-30T15:39:39.795333Z",
                    "number": "14",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-04-01T18:27:19.980721Z",
                    "number": "15",
                    "summary": "Products created (1).| Product Identifiers created (1)."
                },
                {
                    "date": "2026-04-01T18:27:22.095381Z",
                    "number": "16",
                    "summary": "NCSC Score updated."
                }
            ],
            "status": "interim",
            "version": "16"
        }
    },
    "product_tree": {
        "branches": [
            {
                "branches": [
                    {
                        "branches": [
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/openid connect <1.5.0",
                                "product": {
                                    "name": "vers:unknown/openid connect <1.5.0",
                                    "product_id": "CSAFPID-5761776"
                                }
                            }
                        ],
                        "category": "product_name",
                        "name": "Drupal"
                    }
                ],
                "category": "vendor",
                "name": "Open Source"
            },
            {
                "branches": [
                    {
                        "branches": [
                            {
                                "category": "product_version_range",
                                "name": "vers:semver/0.0.0|<1.5.0",
                                "product": {
                                    "name": "vers:semver/0.0.0|<1.5.0",
                                    "product_id": "CSAFPID-5919178"
                                }
                            }
                        ],
                        "category": "product_name",
                        "name": "OpenID Connect / OAuth client"
                    }
                ],
                "category": "vendor",
                "name": "Drupal"
            },
            {
                "branches": [
                    {
                        "branches": [
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/>=0|<1.5.0",
                                "product": {
                                    "name": "vers:unknown/>=0|<1.5.0",
                                    "product_id": "CSAFPID-5759956"
                                }
                            }
                        ],
                        "category": "product_name",
                        "name": "openid_connect"
                    }
                ],
                "category": "vendor",
                "name": "drupal"
            },
            {
                "branches": [
                    {
                        "branches": [
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/<8.x-1.5",
                                "product": {
                                    "name": "vers:unknown/<8.x-1.5",
                                    "product_id": "CSAFPID-5982372",
                                    "product_identification_helper": {
                                        "cpe": "cpe:2.3:a:bojanz:openid_connect_\\/_oauth_client:*:*:*:*:*:drupal:*:*"
                                    }
                                }
                            }
                        ],
                        "category": "product_name",
                        "name": "openid_connect_\\/_oauth_client"
                    }
                ],
                "category": "vendor",
                "name": "bojanz"
            }
        ]
    },
    "vulnerabilities": [
        {
            "cve": "CVE-2026-3531",
            "cwe": {
                "id": "CWE-288",
                "name": "Authentication Bypass Using an Alternate Path or Channel"
            },
            "notes": [
                {
                    "category": "description",
                    "text": "This module enables you to use an external OpenID Connect login provider to authenticate and log in users on your site. If a user signs in with a login provider for the first time on the website, a new Drupal user will be created.\n\nA visitor who successfully logs in to their Identity Provider and is denied access to Drupal through custom code or a server error will maintain their session at the Identity Provider, possibly leading to access bypass situations, especially in a shared computing environment.",
                    "title": "osv - https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/Packagist%2FDRUPAL-CONTRIB-2026-026.json?alt=media"
                },
                {
                    "category": "description",
                    "text": "Authentication Bypass Using an Alternate Path or Channel vulnerability in Drupal OpenID Connect / OAuth client allows Authentication Bypass.This issue affects OpenID Connect / OAuth client: from 0.0.0 before 1.5.0.",
                    "title": "cveprojectv5 - https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/3xxx/CVE-2026-3531.json"
                },
                {
                    "category": "description",
                    "text": "Authentication Bypass Using an Alternate Path or Channel vulnerability in Drupal OpenID Connect / OAuth client allows Authentication Bypass.This issue affects OpenID Connect / OAuth client: from 0.0.0 before 1.5.0.",
                    "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-3531"
                },
                {
                    "category": "other",
                    "text": "0.00024",
                    "title": "EPSS"
                },
                {
                    "category": "other",
                    "text": "5.2",
                    "title": "NCSC Score"
                },
                {
                    "category": "other",
                    "text": "There is product data available from source Certbundde",
                    "title": "NCSC Score top increasing factors"
                },
                {
                    "category": "other",
                    "text": "The value of the most recent EPSS score, Is related to a product by vendor Open Source",
                    "title": "NCSC Score top decreasing factors"
                }
            ],
            "product_status": {
                "known_affected": [
                    "CSAFPID-5759956",
                    "CSAFPID-5761776",
                    "CSAFPID-5919178",
                    "CSAFPID-5982372"
                ]
            },
            "references": [
                {
                    "category": "external",
                    "summary": "Source - osv",
                    "url": "https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/Packagist%2FDRUPAL-CONTRIB-2026-026.json?alt=media"
                },
                {
                    "category": "external",
                    "summary": "Source - certbundde",
                    "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0599.json"
                },
                {
                    "category": "external",
                    "summary": "Source - cveprojectv5",
                    "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/3xxx/CVE-2026-3531.json"
                },
                {
                    "category": "external",
                    "summary": "Source - nvd",
                    "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-3531"
                },
                {
                    "category": "external",
                    "summary": "Source - first",
                    "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0"
                },
                {
                    "category": "external",
                    "summary": "Reference - certbundde; cveprojectv5; nvd; osv",
                    "url": "https://www.drupal.org/sa-contrib-2026-026"
                },
                {
                    "category": "external",
                    "summary": "Reference - certbundde",
                    "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0599.json"
                },
                {
                    "category": "external",
                    "summary": "Reference - certbundde",
                    "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-0599"
                },
                {
                    "category": "external",
                    "summary": "Reference - certbundde",
                    "url": "https://www.drupal.org/sa-contrib-2026-020"
                },
                {
                    "category": "external",
                    "summary": "Reference - certbundde",
                    "url": "https://www.drupal.org/sa-contrib-2026-021"
                },
                {
                    "category": "external",
                    "summary": "Reference - certbundde",
                    "url": "https://www.drupal.org/sa-contrib-2026-022"
                },
                {
                    "category": "external",
                    "summary": "Reference - certbundde",
                    "url": "https://www.drupal.org/sa-contrib-2026-023"
                },
                {
                    "category": "external",
                    "summary": "Reference - certbundde",
                    "url": "https://www.drupal.org/sa-contrib-2026-024"
                },
                {
                    "category": "external",
                    "summary": "Reference - certbundde",
                    "url": "https://www.drupal.org/sa-contrib-2026-025"
                },
                {
                    "category": "external",
                    "summary": "Reference - certbundde",
                    "url": "https://www.drupal.org/sa-contrib-2026-027"
                }
            ],
            "scores": [
                {
                    "cvss_v3": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
                        "baseScore": 6.5,
                        "baseSeverity": "MEDIUM"
                    },
                    "products": [
                        "CSAFPID-5759956",
                        "CSAFPID-5761776",
                        "CSAFPID-5919178",
                        "CSAFPID-5982372"
                    ]
                }
            ],
            "title": "CVE-2026-3531"
        }
    ]
}