{
    "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-2026-34598",
        "tracking": {
            "current_release_date": "2026-04-03T15:37:15.729818Z",
            "generator": {
                "date": "2026-02-17T15:00:00Z",
                "engine": {
                    "name": "V.E.L.M.A",
                    "version": "1.7"
                }
            },
            "id": "CVE-2026-34598",
            "initial_release_date": "2026-04-01T01:03:15.837154Z",
            "revision_history": [
                {
                    "date": "2026-04-01T01:03:15.837154Z",
                    "number": "1",
                    "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (2).| CWES updated (1)."
                },
                {
                    "date": "2026-04-01T01:03:29.229682Z",
                    "number": "2",
                    "summary": "NCSC Score created."
                },
                {
                    "date": "2026-04-02T18:26:59.114596Z",
                    "number": "3",
                    "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (2).| CWES updated (1)."
                },
                {
                    "date": "2026-04-02T18:27:01.843416Z",
                    "number": "4",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-04-02T18:48:08.237505Z",
                    "number": "5",
                    "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products created (1).| References created (2).| CWES updated (1)."
                },
                {
                    "date": "2026-04-02T18:48:10.150780Z",
                    "number": "6",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-04-02T19:39:18.798737Z",
                    "number": "7",
                    "summary": "Unknown change."
                },
                {
                    "date": "2026-04-03T15:31:12.979318Z",
                    "number": "8",
                    "summary": "Source connected.| CVE status created. (valid)| EPSS created."
                },
                {
                    "date": "2026-04-03T15:31:23.389055Z",
                    "number": "9",
                    "summary": "NCSC Score updated."
                }
            ],
            "status": "interim",
            "version": "9"
        }
    },
    "product_tree": {
        "branches": [
            {
                "branches": [
                    {
                        "branches": [
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/<4.6.0",
                                "product": {
                                    "name": "vers:unknown/<4.6.0",
                                    "product_id": "CSAFPID-5985239"
                                }
                            }
                        ],
                        "category": "product_name",
                        "name": "yeswiki"
                    }
                ],
                "category": "vendor",
                "name": "YesWiki"
            }
        ]
    },
    "vulnerabilities": [
        {
            "cve": "CVE-2026-34598",
            "cwe": {
                "id": "CWE-79",
                "name": "Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')"
            },
            "notes": [
                {
                    "category": "description",
                    "text": "### Summary\nA stored and blind XSS vulnerability exists in the form title field. A malicious attacker can inject JavaScript without any authentication via a form title that is saved in the backend database. When any user visits that injected page, the JavaScript payload gets executed.\n\nType: Stored and Blind Cross-Site Scripting (XSS)\nAffected Component: form title input field\nAuthentication Required: No (Unauthenticated attack possible)\nImpact: Arbitrary JavaScript execution in victim’s browser\n\n\n### Details\nA Stored XSS vulnerability occurs when an application stores malicious user input (in this case, a script injected via the form title field) in its backend database and renders it later on a page viewed by other users without proper sanitization or encoding.\n\nIn this case, the attacker can inject JavaScript payloads in the title field of a form, which the application stores in the database. When any user, such as an admin or another visitor, views the page that displays this title, the malicious script executes in their browser context.\n\n### PoC\n- Visit `https://yeswiki.net/?BazaR&vue=formulaire` or `localhost/?BazaR&vue=formulaire` or \n `https://ferme.yeswiki.net/[username]/?BazaR&vue=formulaire`\n- Click on the `+` icon to add a record via the `Diary` form.\n- Inject the payload like: `<script>alert(document.cookie)</script>` or `<script>alert(1)</script>` into `Name of the event` and `Description`\n- Then save the record by clicking `To validate`\n- The payload will be executed when anyone visits `/?BazaR&vue=consulter` also in the diary record \n`/?wiki=BazaR&vue=consulter&action=recherche&q=&id=2&facette=`\n\nThe payload is persistant.",
                    "title": "github - https://api.github.com/advisories/GHSA-37fq-47qj-6j5j"
                },
                {
                    "category": "description",
                    "text": "YesWiki is a wiki system written in PHP. Prior to version 4.6.0, a stored and blind XSS vulnerability exists in the form title field. A malicious attacker can inject JavaScript without any authentication via a form title that is saved in the backend database. When any user visits that injected page, the JavaScript payload gets executed. This issue has been patched in version 4.6.0.",
                    "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-34598"
                },
                {
                    "category": "description",
                    "text": "YesWiki is a wiki system written in PHP. Prior to version 4.6.0, a stored and blind XSS vulnerability exists in the form title field. A malicious attacker can inject JavaScript without any authentication via a form title that is saved in the backend database. When any user visits that injected page, the JavaScript payload gets executed. This issue has been patched in version 4.6.0.",
                    "title": "cveprojectv5 - https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/34xxx/CVE-2026-34598.json"
                },
                {
                    "category": "other",
                    "text": "0.00062",
                    "title": "EPSS"
                },
                {
                    "category": "other",
                    "text": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N",
                    "title": "CVSSV4"
                },
                {
                    "category": "other",
                    "text": "7.1",
                    "title": "CVSSV4 base score"
                },
                {
                    "category": "other",
                    "text": "3.5",
                    "title": "NCSC Score"
                },
                {
                    "category": "other",
                    "text": "The value of the most recent CVSS (V3) score, The value of the most recent EPSS score, Is related to (a version of) an uncommon product, There is cwe data available from source Nvd, Is related to CWE-79 (Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'))",
                    "title": "NCSC Score top decreasing factors"
                }
            ],
            "product_status": {
                "known_affected": [
                    "CSAFPID-5985239"
                ]
            },
            "references": [
                {
                    "category": "external",
                    "summary": "Source - github",
                    "url": "https://api.github.com/advisories/GHSA-37fq-47qj-6j5j"
                },
                {
                    "category": "external",
                    "summary": "Source - nvd",
                    "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-34598"
                },
                {
                    "category": "external",
                    "summary": "Source - cveprojectv5",
                    "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/34xxx/CVE-2026-34598.json"
                },
                {
                    "category": "external",
                    "summary": "Source - first",
                    "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0"
                },
                {
                    "category": "external",
                    "summary": "Reference - cveprojectv5; github; nvd",
                    "url": "https://github.com/YesWiki/yeswiki/security/advisories/GHSA-37fq-47qj-6j5j"
                },
                {
                    "category": "external",
                    "summary": "Reference - github",
                    "url": "https://github.com/advisories/GHSA-37fq-47qj-6j5j"
                },
                {
                    "category": "external",
                    "summary": "Reference - cveprojectv5; nvd",
                    "url": "https://github.com/YesWiki/yeswiki/releases/tag/v4.6.0"
                }
            ],
            "title": "CVE-2026-34598"
        }
    ]
}