CVE-2026-30934CWE-79

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

High · published March 10, 2026

CVSS v3.1
8.9
EPSS
0%
Percentile
30.2
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
8.9 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L
CVSS v4.0
Not supplied
EPSS
0.00375 · 30.2th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-03-10T16:12Z
EPSS history
Timeline
  • 10 MAR 16:12Z
    FileBrowser Quantum: Stored XSS in public share page via unsanitized share metadata (text/template misuse)
    cvelistv5