What is the CVSS score of CVE-2026-30933?

CVE-2026-30933 has a CVSS 3.1 base score of 7.5 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N. EPSS exploitation probability: 0.1%.

How to fix or mitigate CVE-2026-30933?

Within 24 hours: Identify all FileBrowser Quantum instances in your environment and document versions currently deployed. Within 7 days: Implement network segmentation to restrict access to FileBrowser Quantum to trusted users only; consider disabling the application if not business-critical until patched. Within 30 days: Monitor vendor releases for version 1.3.1-beta or 1.2.2-stable availability and apply patches immediately upon release; establish a process to track CVE-2026-27611 and related disclosures.

Filebrowser CVE-2026-30933

HIGH

Information Exposure (CWE-200)

2026-03-10 security-advisories@github.com

GHSA-525j-95gf-766f

Information Disclosure Filebrowser Suse

7.5

CVSS 3.1 · GitHub Advisory

View

Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

Access

Access /public/api/share/info endpoint
Exploit

Request password-protected share metadata
Execution

Extract tokenized downloadURL from response
Impact

Use token to bypass access controls

Vulnerability Assessment

Weakness	CWE CWE-200 OWASP Top 10:2025 A01:2025 - Broken Access Control ASVS 5.0 V14 - Data Protection Data exposure prevention MITRE ATT&CK 2 techniques across 2 tactics: Collection, Discovery The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Exploitation Conditions	FileBrowser Quantum versions prior to 1.3.1-beta and 1.2.2-stable with password-protected shares enabled. No authentication required — unauthenticated remote access to /public/api/share/info endpoint.
Impact	CVSS 7.5 (HIGH). Attack vector: Network. Complexity: Low. Privileges required: None. User interaction: None.
Exploit ScenarioDerived	An attacker could exploit this vulnerability to compromise the affected system.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

Patch available 0.1% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

FileBrowser versions prior to 1.3.1-beta and 1.2.2-stable leak authentication tokens through the /public/api/share/info endpoint, allowing unauthenticated attackers to bypass password protections on shared files. The vulnerability stems from an incomplete fix to CVE-2026-27611 and enables token disclosure that could facilitate unauthorized file access. No patch is currently available for affected installations.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 21:55 CVSS 7.5

FileBrowser Quantum is a free, self-hosted, web-based file manager. Prior to 1.3.1-beta and 1.2.2-stable, the remediation for CVE-2026-27611 is incomplete. [CVSS 7.5 HIGH]

RemediationAI

Fixed in version 1.3.1. Restrict network access to the affected service where possible.

Affected Packages

go github.com/gtsteffaniak/filebrowser/backend fix: 0.0.0-20260307130210-09713b32a5f6

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-200 (Information Exposure). 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, the remediation for CVE-2026-27611 is incomplete. Password protected shares still disclose tokenized downloadURL via /public/api/share/info. 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

GitHub Advisory PRIMARY 7.5 HIGH

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

SUSE HIGH

Primary rating from GitHub Advisory.

CVSS VectorGitHub Advisory

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Lifecycle Timeline

Patch released

Mar 31, 2026 - 21:13 nvd

Patch available

CVE Published

Mar 10, 2026 - 18:18 nvd

HIGH 7.5

DescriptionGitHub Advisory

FileBrowser Quantum is a free, self-hosted, web-based file manager. Prior to 1.3.1-beta and 1.2.2-stable, the remediation for CVE-2026-27611 is incomplete. Password protected shares still disclose tokenized downloadURL via /public/api/share/info. This vulnerability is fixed in 1.3.1-beta and 1.2.2-stable.

Executive ViewAI

Why It Matters

FileBrowser Quantum contains a high-severity vulnerability (CVE-2026-30933) affecting self-hosted file manager deployments. Organizations using affected versions risk unauthorized file access or manipulation due to an incomplete security fix from a prior vulnerability. Immediate assessment and mitigation are required to prevent data breach or system compromise.

Business Impact: High

Compensating Controls

Implement WAF rules to restrict access to FileBrowser Quantum endpoints; enforce strict network segmentation limiting access to authorized administrators only; require multi-factor authentication for all FileBrowser Quantum access; enable comprehensive audit logging and monitor for suspicious file access patterns; consider disabling the application until patch availability; restrict file types or directories accessible through the interface.

Threat Intelligence Overview

EPSS Score

0.1%

Top 84% exploitable

Threat Intel

1 source

Data Quality

5 sources

Confidence: Medium

NVD

CVE.org

EPSS GHSA Vendor

GitHub

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.

SignalValue

Severity HIGH

CISA KEV No

Public POC No

EPSS 0.1%

Patch available Yes

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

None

System Exposure· derived

Open

Automatable· derived

Yes

Human Impact

High

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +38

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.