{
    "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-2026-34523",
        "tracking": {
            "current_release_date": "2026-04-03T17:05:52.259429Z",
            "generator": {
                "date": "2026-02-17T15:00:00Z",
                "engine": {
                    "name": "V.E.L.M.A",
                    "version": "1.7"
                }
            },
            "id": "CVE-2026-34523",
            "initial_release_date": "2026-04-01T23:02:42.400922Z",
            "revision_history": [
                {
                    "date": "2026-04-01T23:02:42.400922Z",
                    "number": "1",
                    "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (2).| CWES updated (1)."
                },
                {
                    "date": "2026-04-01T23:02:44.433621Z",
                    "number": "2",
                    "summary": "NCSC Score created."
                },
                {
                    "date": "2026-04-02T17:38:44.168477Z",
                    "number": "3",
                    "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products created (1).| References created (2).| CWES updated (1)."
                },
                {
                    "date": "2026-04-02T17:38:53.217401Z",
                    "number": "4",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-04-02T18:26:34.057490Z",
                    "number": "5",
                    "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (2).| CWES updated (1)."
                },
                {
                    "date": "2026-04-02T18:26:35.503900Z",
                    "number": "6",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-04-03T15:31:28.223792Z",
                    "number": "7",
                    "summary": "Source connected.| CVE status created. (valid)| EPSS created."
                },
                {
                    "date": "2026-04-03T15:31:36.601838Z",
                    "number": "8",
                    "summary": "NCSC Score updated."
                },
                {
                    "date": "2026-04-03T16:38:55.604000Z",
                    "number": "9",
                    "summary": "Unknown change."
                }
            ],
            "status": "interim",
            "version": "9"
        }
    },
    "product_tree": {
        "branches": [
            {
                "branches": [
                    {
                        "branches": [
                            {
                                "category": "product_version_range",
                                "name": "vers:unknown/<1.17.0",
                                "product": {
                                    "name": "vers:unknown/<1.17.0",
                                    "product_id": "CSAFPID-5985091"
                                }
                            }
                        ],
                        "category": "product_name",
                        "name": "SillyTavern"
                    }
                ],
                "category": "vendor",
                "name": "SillyTavern"
            }
        ]
    },
    "vulnerabilities": [
        {
            "cve": "CVE-2026-34523",
            "cwe": {
                "id": "CWE-22",
                "name": "Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')"
            },
            "notes": [
                {
                    "category": "description",
                    "text": "### Summary\n\nA path traversal vulnerability in the static file route handler allows any unauthenticated user to determine whether files exist anywhere on the server's filesystem. By sending percent-encoded `../` sequences (`%2E%2E%2F`) in requests to static file routes, an attacker can check for the existence of files (404 if it doesn't exist, 403 means it exists).\n\n### Details\n\nThe vulnerability is in `createRouteHandler` (`src/users.js:947–963`), which backs all user-data static file routes:\n\n```javascript\nfunction createRouteHandler(directoryFn) {\n    return async (req, res) => {\n        const directory = directoryFn(req);\n        const filePath = decodeURIComponent(req.params[0]);\n        const exists = fs.existsSync(path.join(directory, filePath)); // no boundary check here\n        if (!exists) {\n            return res.sendStatus(404);\n        }\n        return res.sendFile(filePath, { root: directory });\n    };\n}\n```\n\n`req.params[0]` contains the raw (percent-encoded) wildcard from the URL. After `decodeURIComponent`, a request path like `/characters/%2E%2E%2F%2E%2E%2FUsers/kirakira` decodes to `../../Users/kirakira`, and `path.join` resolves it outside the intended directory. `res.sendFile` correctly blocks the file from being served (the `send` module's root check returns 403), but `fs.existsSync` had already run, and the 403/404 distinction reveals the result.\n\nAffected routes (they all use the same handler, so they're all affected):\n\n- `/characters/*`\n- `/user/files/*`\n- `/assets/*`\n- `/user/images/*`\n- `/backgrounds/*`\n- `/User%20Avatars/*`\n\n### PoC\n\n```bash\ncurl -o /dev/null -s -w \"%{http_code}\\n\" \"http://localhost:8000/characters/%2E%2E%2F%2E%2E%2F%2E%2E%2F%2E%2E%2F%2E%2E%2F%2E%2E%2F%2E%2E%2FUsers/kirakira/something\"\n```\n\n### Impact\n\nWhile file contents cannot be read (the `send` module blocks actual delivery), anyone who can reach the SillyTavern HTTP port can check the existence of files on the host filesystem.\n\n### Resolution\n\nThe issue was addressed in version 1.17.0.",
                    "title": "github - https://api.github.com/advisories/GHSA-525j-2hrj-m8fp"
                },
                {
                    "category": "description",
                    "text": "SillyTavern is a locally installed user interface that allows users to interact with text generation large language models, image generation engines, and text-to-speech voice models. Prior to version 1.17.0, a path traversal vulnerability in the static file route handler allows any unauthenticated user to determine whether files exist anywhere on the server's filesystem. by sending percent-encoded \"../\" sequences (%2E%2E%2F) in requests to static file routes, an attacker can check for the existence of files. This issue has been patched in version 1.17.0.",
                    "title": "cveprojectv5 - https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/34xxx/CVE-2026-34523.json"
                },
                {
                    "category": "description",
                    "text": "SillyTavern is a locally installed user interface that allows users to interact with text generation large language models, image generation engines, and text-to-speech voice models. Prior to version 1.17.0, a path traversal vulnerability in the static file route handler allows any unauthenticated user to determine whether files exist anywhere on the server's filesystem. by sending percent-encoded \"../\" sequences (%2E%2E%2F) in requests to static file routes, an attacker can check for the existence of files. This issue has been patched in version 1.17.0.",
                    "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-34523"
                },
                {
                    "category": "other",
                    "text": "0.00064",
                    "title": "EPSS"
                },
                {
                    "category": "other",
                    "text": "3.8",
                    "title": "NCSC Score"
                },
                {
                    "category": "other",
                    "text": "The value of the most recent EPSS score, There is cwe data available from source Nvd",
                    "title": "NCSC Score top decreasing factors"
                }
            ],
            "product_status": {
                "known_affected": [
                    "CSAFPID-5985091"
                ]
            },
            "references": [
                {
                    "category": "external",
                    "summary": "Source - github",
                    "url": "https://api.github.com/advisories/GHSA-525j-2hrj-m8fp"
                },
                {
                    "category": "external",
                    "summary": "Source - cveprojectv5",
                    "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/34xxx/CVE-2026-34523.json"
                },
                {
                    "category": "external",
                    "summary": "Source - nvd",
                    "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-34523"
                },
                {
                    "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/SillyTavern/SillyTavern/security/advisories/GHSA-525j-2hrj-m8fp"
                },
                {
                    "category": "external",
                    "summary": "Reference - github",
                    "url": "https://github.com/advisories/GHSA-525j-2hrj-m8fp"
                },
                {
                    "category": "external",
                    "summary": "Reference - cveprojectv5; nvd",
                    "url": "https://github.com/SillyTavern/SillyTavern/releases/tag/1.17.0"
                }
            ],
            "scores": [
                {
                    "cvss_v3": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
                        "baseScore": 5.3,
                        "baseSeverity": "MEDIUM"
                    },
                    "products": [
                        "CSAFPID-5985091"
                    ]
                }
            ],
            "title": "CVE-2026-34523"
        }
    ]
}