FileBrowser Quantum: Stored XSS in public share page via unsanitized share metadata (text/template misuse)
Priority HIGH 74CWE-79Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- High · High · Low
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-79.
Summary
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.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00413 35th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed filebrowser (gtsteffaniak): 1.3.1-beta, 1.2.2-stablegithub.com/gtsteffaniak/filebrowser (Go): 0.0.0-20260307130210-09713b32a5f6
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| gtsteffaniak | filebrowser | 1.3.0-beta to before 1.3.1-beta; before 1.2.2-stable | 1.3.1-beta, 1.2.2-stable | Patch available | CNA |
| — | github.com/gtsteffaniak/filebrowser (Go) | before 0.0.0-20260307130210-09713b32a5f6 | 0.0.0-20260307130210-09713b32a5f6 | Patch available | GHSA-r633-fcgp-m532 |
- filebrowser Vendorgtsteffaniak Affected 1.3.0-beta to before 1.3.1-beta; before 1.2.2-stable Fixed in 1.3.1-beta, 1.2.2-stable Patch available CNA
- github.com/gtsteffaniak/filebrowser (Go) Vendor— Affected before 0.0.0-20260307130210-09713b32a5f6 Fixed in 0.0.0-20260307130210-09713b32a5f6 Patch available GHSA-r633-fcgp-m532
CPE configurations NVD · 3
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:filebrowser:filebrowser:*:*:*:*:*:*:*:* | up to 1.2.9 | Vulnerable | filebrowser |
| cpe:2.3:a:filebrowser:filebrowser:1.2.1:stable:*:*:*:*:*:* | 1.2.1 stable | Vulnerable | filebrowser |
| cpe:2.3:a:filebrowser:filebrowser:1.3.0:beta:*:*:*:*:*:* | 1.3.0 beta | Vulnerable | filebrowser |
- cpe:2.3:a:filebrowser:filebrowser:*:*:*:*:*:*:*:* Versions up to 1.2.9 Vulnerable ·filebrowser
- cpe:2.3:a:filebrowser:filebrowser:1.2.1:stable:*:*:*:*:*:* Versions 1.2.1 stable Vulnerable ·filebrowser
- cpe:2.3:a:filebrowser:filebrowser:1.3.0:beta:*:*:*:*:*:* Versions 1.3.0 beta Vulnerable ·filebrowser
Remediation
- Fix · CNA filebrowser (gtsteffaniak) Fixed in 1.3.1-beta, 1.2.2-stable
- Fix · GHSA-r633-fcgp-m532 github.com/gtsteffaniak/filebrowser (Go) Fixed in 0.0.0-20260307130210-09713b32a5f6 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-30934
- 2026-10-03 Alias added: GHSA-r633-fcgp-m532
References
More gtsteffaniak vulnerabilities
- TI-2026-36047 FileBrowser Quantum: Path Traversal in public share PATCH allows file ops outside shared directory CVSS 4.0CRITICAL 9.3
- TI-2026-32454 FileBrowser Quantum: Unauthenticated Path Traversal in Public Share Delete Allows Arbitrary File Deletion CVSS 3.1CRITICAL 9.1
- TI-2026-81497 Symlink following in FileBrowser Quantum exposes out-of-scope files CVSS 3.1HIGH 8.6
- TI-2026-23758 FileBrowser Quantum Incomplete Remediation of CVE-2026-27611: Password-Protected Share Bypass via /public/api/share/info CVSS 3.1HIGH 7.5
- TI-2026-21997 FileBrowser Quantum: Password Protection Not Enforced on Shared File Links CVSS 4.0HIGH 7.1
- TI-2026-39682 FileBrowser Quantum's path traversal issue in subtitle handler allows any authenticated user to read arbitrary files CVSS 3.1HIGH 7.7
Sources
- CVE-2026-30934 · CVE Program
- CVE-2026-30934 · NVD
- FIRST EPSS
- GHSA-r633-fcgp-m532 · GitHub Advisory Database · CC BY 4.0
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