CVE-2026-30934 json
FileBrowser Quantum: Stored XSS in public share page via unsanitized share metadata (text/template misuse)
published 2026-03-09 8 mo ago modified 2026-06-17 4 mo ago also EUVD-2026-10545 , GHSA-r633-fcgp-m532 , GO-2026-4660
- cvss
- 8.9
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 35%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- go github.com/gtsteffaniak/filebrowser 0.0.0-20260307130210-09713b32a5f6
- gtsteffaniak filebrowser_quantum 1.2.2-stable, 1.3.1-beta
- govulncheck-vulndb openSUSE Leap 15.6 0.0.20260317T205859-150000.1.152.1
suse advisories SUSE-SU-2026:1042-1
- govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1
opensuse advisories openSUSE-SU-2026:21483-1
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- total
- Assessed
- 8 mo ago
Exploit prediction
0.41% chance of exploitation in the next 30 days, higher than 35% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/gtsteffaniak/filebrowser/security/advisories/GHSA-r633-fcgp-m532 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.9 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L |
| GitHub | 3.1 | 8.9 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L |
| NVD | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | github.com/gtsteffaniak/filebrowser | <0.0.0-20260307130210-09713b32a5f6 |
0.0.0-20260307130210-09713b32a5f6 |
Affected products
- gtsteffaniak filebrowser
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
github.com
/gtsteffaniak/filebrowser/security/advisories/GHSA-r633-fcgp-m532
web, exploit, vendor-advisory, advisory
-
github.com
/gtsteffaniak/filebrowser/releases/tag/v1.2.2-stable
web, release-notes
-
github.com
/gtsteffaniak/filebrowser/releases/tag/v1.3.1-beta
web, release-notes
-
nvd.nist.gov
/vuln/detail/CVE-2026-30934
advisory
-
github.com
/gtsteffaniak/filebrowser
package
-
pkg.go.dev
/vuln/GO-2026-4660
web
Sources
- CVE List CVE-2026-30934
- GitHub Advisory GHSA-r633-fcgp-m532
- NVD CVE-2026-30934
- OSV GO-2026-4660
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.