Filebrowser
CVE-2026-30934
HIGH
GHSA-r633-fcgp-m532
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain
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AccessAuthenticated user creates file share
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ExploitInjects malicious script in metadata fields
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ExecutionVictim visits public share URL
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ImpactScript executes in victim browser
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V1 - Encoding and Sanitization Output encoding, context-aware escaping
MITRE ATT&CK
2 techniques across 2 tactics: Initial Access, Execution The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Exploitation Conditions | FileBrowser Quantum versions prior to 1.3.1-beta or 1.2.2-stable; attacker requires valid login credentials; victim must click/visit the crafted /public/share/<hash> URL. |
| Impact | CVSS 8.9 (HIGH). Attack vector: Network. Complexity: Low. Privileges required: Low. User interaction: Required. |
| Exploit ScenarioDerived | An attacker could exploit this vulnerability to compromise the affected system. |
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Alert meAnalysisAIv1 – Mar 12, 2026
Stored cross-site scripting in FileBrowser versions prior to 1.3.1-beta and 1.2.2-stable allows authenticated attackers to inject malicious scripts through share metadata fields that are improperly rendered without HTML escaping. When victims visit affected share URLs, the injected scripts execute in their browsers with full privileges, potentially leading to session hijacking, credential theft, or further compromise. A patch is available in the fixed versions, though exploitation currently shows 0% adoption likelihood.
Earlier versions of this analysis (1)
FileBrowser Quantum is a free, self-hosted, web-based file manager. Prior to 1.3.1-beta and 1.2.2-stable, Stored XSS is possible via share metadata fields (e.g., title, description) that are rendered into HTML for /public/share/<hash> without context-aware escaping. [CVSS 8.9 HIGH]
RemediationAI
Fixed in version 1.3.1. Implement output encoding and Content Security Policy headers. Restrict network access to the affected service where possible.
Affected Packages
Source: OSV (Open Source Vulnerabilities)
Affects your stack
Affects 1 package in go
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
Classified as CWE-79 (Cross-site Scripting (XSS)). Affects web-based file manager.. FileBrowser Quantum is a free, self-hosted, web-based file manager. Prior to 1.3.1-beta and 1.2.2-stable, Stored XSS is possible via share metadata fields (e.g., title, description) that are rendered into HTML for /public/share/<hash> without context-aware escaping. The server uses text/template instead of html/template, allowing injected scripts to execute when victims visit the share URL. This vulnerability is fixed in 1.3.1-beta and 1.2.2-stable.
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- Exploit and PoC references, threat intelligence from 22 sources
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Severity by source
AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L
Primary rating from GitHub Advisory.
CVSS VectorGitHub Advisory
Lifecycle Timeline
2DescriptionGitHub Advisory
FileBrowser Quantum is a free, self-hosted, web-based file manager. Prior to 1.3.1-beta and 1.2.2-stable, Stored XSS is possible via share metadata fields (e.g., title, description) that are rendered into HTML for /public/share/<hash> without context-aware escaping. The server uses text/template instead of html/template, allowing injected scripts to execute when victims visit the share URL. This vulnerability is fixed in 1.3.1-beta and 1.2.2-stable.
Executive ViewAI
FileBrowser Quantum deployments are vulnerable to Stored Cross-Site Scripting (XSS) attacks through share metadata fields, allowing attackers to inject malicious code that executes when users access shared files. This affects any organization using FileBrowser Quantum versions prior to 1.3.1-beta or 1.2.2-stable, potentially compromising user sessions, credentials, and sensitive data accessed through shared links.
Disable public share functionality if not operationally critical; implement Web Application Firewall (WAF) rules to sanitize or block HTML/JavaScript characters (< > " ' script) in share metadata parameters; restrict network access to FileBrowser instances to authenticated corporate networks only; implement Content Security Policy (CSP) headers to prevent inline script execution; monitor public share URLs for suspicious access patterns; require user authentication for all file access where possible instead of public shares.
Threat Intelligence Overview
NVD
CVE.org
EPSS
VulDB
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Cross-Site Scripting occurs when an application accepts untrusted data and sends it to a web browser without proper validation or encoding.
Affected Products (CPE)GitHub Advisory
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