CVE-2026-30934

moderate-risk
Published 2026-03-10

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.

Do I need to act?

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0.04% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
8
CVSS 8.9/10 High
NETWORK / LOW complexity

Affected Products (3)

Affected Vendors

Filebrowser

References (3)

Release Notes https://github.com/gtsteffaniak/filebrowser/releases/tag/v1.2.2-stable
Release Notes https://github.com/gtsteffaniak/filebrowser/releases/tag/v1.3.1-beta
Exploit https://github.com/gtsteffaniak/filebrowser/security/advisories/GHSA-r633-fcgp-m...
39
/ 100
moderate-risk
Severity 30/34 · Critical
Exploitability 0/34 · Minimal
Exposure 9/34 · Low