What’s Vulnerable › Vulnerabilities

CVE-2026-30934: FileBrowser Quantum: Stored XSS in public share page via unsanitized share metadata (text/template misuse)

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-03-10 · updated 2026-06-17
• Weakness: CWE-79

Description

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.

Affected products

• filebrowser: through 1.2.9; 1.2.1-stable, 1.3.0-beta

References

• https://github.com/gtsteffaniak/filebrowser/releases/tag/v1.2.2-stable
• https://github.com/gtsteffaniak/filebrowser/releases/tag/v1.3.1-beta
• https://github.com/gtsteffaniak/filebrowser/security/advisories/GHSA-r633-fcgp-m532

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