Medium severity · published Mar 10, 2026
CVE-2026-30934
FileBrowser Quantum: Stored XSS in public share page via unsanitized share metadata (text/template misuse)
5.4
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 31% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FI
filebrowser · gtsteffaniak
>= 1.3.0-beta, < 1.3.1-beta; < 1.2.2-stable · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-30934
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-30934
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-m532
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