{
    "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-2026-31816",
        "tracking": {
            "current_release_date": "2026-03-26T15:09:54.304831Z",
            "generator": {
                "date": "2026-02-17T15:00:00Z",
                "engine": {
                    "name": "V.E.L.M.A",
                    "version": "1.7"
                }
            },
            "id": "CVE-2026-31816",
            "initial_release_date": "2026-03-09T21:26:18.316631Z",
            "revision_history": [
                {
                    "date": "2026-03-09T21:26:18.316631Z",
                    "number": "1",
                    "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (1).| CWES updated (1)."
                },
                {
                    "date": "2026-03-09T21:26:23.021731Z",
                    "number": "2",
                    "summary": "NCSC Score created."
                },
                {
                    "date": "2026-03-09T21:38:46.826831Z",
                    "number": "3",
                    "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products created (1).| References created (1).| CWES updated (1)."
                },
                {
                    "date": "2026-03-09T21:38:49.263484Z",
                    "number": "4",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-10T12:05:51.485004Z",
                    "number": "5",
                    "summary": "Source connected.| CVE status created. (valid)| Products connected (1).| References created (8)."
                },
                {
                    "date": "2026-03-10T12:05:53.816228Z",
                    "number": "6",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-10T14:20:49.326706Z",
                    "number": "7",
                    "summary": "Source created.| CVE status created. (valid)| EPSS created."
                },
                {
                    "date": "2026-03-10T14:20:51.387205Z",
                    "number": "8",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-10T15:38:39.941683Z",
                    "number": "9",
                    "summary": "Unknown change."
                },
                {
                    "date": "2026-03-13T18:25:01.182191Z",
                    "number": "10",
                    "summary": "Products created (1).| Product Identifiers created (1).| Exploits created (1)."
                },
                {
                    "date": "2026-03-13T18:25:04.660036Z",
                    "number": "11",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-20T09:32:49.211335Z",
                    "number": "12",
                    "summary": "Source connected.| CVE status created. (valid)| EPSS created."
                },
                {
                    "date": "2026-03-20T09:32:52.384428Z",
                    "number": "13",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-21T15:26:33.365689Z",
                    "number": "14",
                    "summary": "EPSS updated."
                },
                {
                    "date": "2026-03-21T15:26:44.704946Z",
                    "number": "15",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-25T18:00:58.227850Z",
                    "number": "16",
                    "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Exploits created (1).| References created (2).| CWES updated (1)."
                },
                {
                    "date": "2026-03-25T18:00:59.327379Z",
                    "number": "17",
                    "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Exploits created (1).| References created (2).| CWES updated (1)."
                },
                {
                    "date": "2026-03-25T18:00:59.598350Z",
                    "number": "18",
                    "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Exploits created (1).| References created (1).| CWES updated (1)."
                },
                {
                    "date": "2026-03-25T18:01:04.250784Z",
                    "number": "19",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-03-26T15:06:09.973490Z",
                    "number": "20",
                    "summary": "EPSS updated."
                },
                {
                    "date": "2026-03-26T15:06:13.176820Z",
                    "number": "21",
                    "summary": "NCSC Score updated."
                }
            ],
            "status": "interim",
            "version": "21"
        }
    },
    "product_tree": {
        "branches": [
            {
                "branches": [
                    {
                        "branches": [
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/<=3.31.4",
                                "product": {
                                    "name": "vers:unknown/<=3.31.4",
                                    "product_id": "CSAFPID-5815330",
                                    "product_identification_helper": {
                                        "cpe": "cpe:2.3:a:budibase:budibase:*:*:*:*:*:*:*:*"
                                    }
                                }
                            }
                        ],
                        "category": "product_name",
                        "name": "Budibase"
                    },
                    {
                        "branches": [
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/<=3.31.4",
                                "product": {
                                    "name": "vers:unknown/<=3.31.4",
                                    "product_id": "CSAFPID-5772489"
                                }
                            }
                        ],
                        "category": "product_name",
                        "name": "budibase"
                    }
                ],
                "category": "vendor",
                "name": "Budibase"
            },
            {
                "branches": [
                    {
                        "branches": [
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/<3.32.4",
                                "product": {
                                    "name": "vers:unknown/<3.32.4",
                                    "product_id": "CSAFPID-5774491"
                                }
                            }
                        ],
                        "category": "product_name",
                        "name": "Budibase"
                    }
                ],
                "category": "vendor",
                "name": "Open Source"
            }
        ]
    },
    "vulnerabilities": [
        {
            "cve": "CVE-2026-31816",
            "notes": [
                {
                    "category": "description",
                    "text": "Budibase is a low code platform for creating internal tools, workflows, and admin panels. In 3.31.4 and earlier, the Budibase server's authorized() middleware that protects every server-side API endpoint can be completely bypassed by appending a webhook path pattern to the query string of any request. The isWebhookEndpoint() function uses an unanchored regex that tests against ctx.request.url, which in Koa includes the full URL with query parameters. When the regex matches, the authorized() middleware immediately calls return next(), skipping all authentication, authorization, role checks, and CSRF protection. This means a completely unauthenticated, remote attacker can access any server-side API endpoint by simply appending ?/webhooks/trigger (or any webhook pattern variant) to the URL.",
                    "title": "nvd - https://nvd.nist.gov/vuln/detail/CVE-2026-31816"
                },
                {
                    "category": "description",
                    "text": "Budibase is a low code platform for creating internal tools, workflows, and admin panels. In 3.31.4 and earlier, the Budibase server's authorized() middleware that protects every server-side API endpoint can be completely bypassed by appending a webhook path pattern to the query string of any request. The isWebhookEndpoint() function uses an unanchored regex that tests against ctx.request.url, which in Koa includes the full URL with query parameters. When the regex matches, the authorized() middleware immediately calls return next(), skipping all authentication, authorization, role checks, and CSRF protection. This means a completely unauthenticated, remote attacker can access any server-side API endpoint by simply appending ?/webhooks/trigger (or any webhook pattern variant) to the URL.",
                    "title": "cveprojectv5 - https://www.cve.org/CVERecord?id=CVE-2026-31816"
                },
                {
                    "category": "description",
                    "text": "Budibase <= 3.31.4 contains an authentication bypass caused by unanchored regex in authorized() middleware matching webhook path patterns in query strings, letting unauthenticated remote attackers access any server-side API endpoint, exploit requires crafted request with webhook pattern in URL.\n",
                    "title": "nucleitemplates - https://github.com/projectdiscovery/nuclei-templates/raw/d91ea114d85e060bc90e5e42053473c301909648/http%2Fcves%2F2026%2FCVE-2026-31816.yaml"
                },
                {
                    "category": "description",
                    "text": "Budibase <= 3.31.4 contains an authentication bypass caused by unanchored regex in authorized() middleware matching webhook path patterns in query strings, letting unauthenticated remote attackers access any server-side API endpoint, exploit requires crafted request with webhook pattern in URL.\n",
                    "title": "nucleitemplates - https://github.com/projectdiscovery/nuclei-templates/raw/5171f76afae474379514e4b8c2c286637ce0044c/http%2Fcves%2F2026%2FCVE-2026-31816.yaml"
                },
                {
                    "category": "description",
                    "text": "Budibase <= 3.31.4 contains an authentication bypass caused by unanchored regex in authorized() middleware matching webhook path patterns in query strings, letting unauthenticated remote attackers access any server-side API endpoint, exploit requires crafted request with webhook pattern in URL.\n",
                    "title": "nucleitemplates - https://github.com/projectdiscovery/nuclei-templates/raw/683f829803868367e3a1fca02a842a9d84f175e0/http%2Fcves%2F2026%2FCVE-2026-31816.yaml"
                },
                {
                    "category": "other",
                    "text": "0.08419",
                    "title": "EPSS"
                },
                {
                    "category": "other",
                    "text": "4.5",
                    "title": "NCSC Score"
                },
                {
                    "category": "other",
                    "text": "The value of the most recent EPSS score, There is product data available from source Certbundde",
                    "title": "NCSC Score top increasing factors"
                },
                {
                    "category": "other",
                    "text": "Is related to (a version of) an uncommon product, The CVSS vector string contains A:H (Availability Impact: High), There is exploit data available from source Nvd",
                    "title": "NCSC Score top decreasing factors"
                }
            ],
            "product_status": {
                "known_affected": [
                    "CSAFPID-5772489",
                    "CSAFPID-5774491",
                    "CSAFPID-5815330"
                ]
            },
            "references": [
                {
                    "category": "external",
                    "summary": "Source - nvd",
                    "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31816"
                },
                {
                    "category": "external",
                    "summary": "Source raw - nvd",
                    "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-31816"
                },
                {
                    "category": "external",
                    "summary": "Source - cveprojectv5",
                    "url": "https://www.cve.org/CVERecord?id=CVE-2026-31816"
                },
                {
                    "category": "external",
                    "summary": "Source raw - cveprojectv5",
                    "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/31xxx/CVE-2026-31816.json"
                },
                {
                    "category": "external",
                    "summary": "Source - certbundde",
                    "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0651.json"
                },
                {
                    "category": "external",
                    "summary": "Source - first",
                    "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-31816"
                },
                {
                    "category": "external",
                    "summary": "Source raw - first",
                    "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0"
                },
                {
                    "category": "external",
                    "summary": "Source - first",
                    "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0"
                },
                {
                    "category": "external",
                    "summary": "Source - nucleitemplates",
                    "url": "https://github.com/projectdiscovery/nuclei-templates/raw/d91ea114d85e060bc90e5e42053473c301909648/http%2Fcves%2F2026%2FCVE-2026-31816.yaml"
                },
                {
                    "category": "external",
                    "summary": "Source - nucleitemplates",
                    "url": "https://github.com/projectdiscovery/nuclei-templates/raw/5171f76afae474379514e4b8c2c286637ce0044c/http%2Fcves%2F2026%2FCVE-2026-31816.yaml"
                },
                {
                    "category": "external",
                    "summary": "Source - nucleitemplates",
                    "url": "https://github.com/projectdiscovery/nuclei-templates/raw/683f829803868367e3a1fca02a842a9d84f175e0/http%2Fcves%2F2026%2FCVE-2026-31816.yaml"
                },
                {
                    "category": "external",
                    "summary": "Reference - certbundde; cveprojectv5; nucleitemplates; nvd",
                    "url": "https://github.com/Budibase/budibase/security/advisories/GHSA-gw94-hprh-4wj8"
                },
                {
                    "category": "external",
                    "summary": "Reference - certbundde",
                    "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0651.json"
                },
                {
                    "category": "external",
                    "summary": "Reference - certbundde",
                    "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-0651"
                },
                {
                    "category": "external",
                    "summary": "Reference - certbundde",
                    "url": "https://github.com/Budibase/budibase/security/advisories/GHSA-726g-59wr-cj4c"
                },
                {
                    "category": "external",
                    "summary": "Reference - certbundde",
                    "url": "https://github.com/Budibase/budibase/security/advisories/GHSA-2g39-332f-68p9"
                },
                {
                    "category": "external",
                    "summary": "Reference - certbundde",
                    "url": "https://github.com/Budibase/budibase/security/advisories/GHSA-2hfr-343j-863r"
                },
                {
                    "category": "external",
                    "summary": "Reference - certbundde",
                    "url": "https://github.com/Budibase/budibase/security/advisories/GHSA-pqcr-jmfv-c9cp"
                },
                {
                    "category": "external",
                    "summary": "Reference - certbundde",
                    "url": "https://github.com/Budibase/budibase/releases"
                },
                {
                    "category": "external",
                    "summary": "Reference - nucleitemplates",
                    "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31816"
                }
            ],
            "scores": [
                {
                    "cvss_v3": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
                        "baseScore": 9.1,
                        "baseSeverity": "CRITICAL"
                    },
                    "products": [
                        "CSAFPID-5772489",
                        "CSAFPID-5774491",
                        "CSAFPID-5815330"
                    ]
                }
            ],
            "title": "CVE-2026-31816"
        }
    ]
}