CVE-2026-30934: filebrowser Cross-site Scripting
Vulnerability summary
CVE-2026-30934 is a high (CVSS 8.9) Cross-site Scripting vulnerability in filebrowser. EPSS estimates a 0.38% chance of exploitation in the next 30 days, higher than 30.2% of scored vulnerabilities. 1 public exploit is recorded.
Advisory lineage
Upstream 0 · Downstream 2 · Related 2Timeline
- 10-03-2026PublishedVulnerability first disclosed.
- 10-03-2026Last modifiedVulnerability information updated.
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 metrics
3 scores · 3 sources · 1 version- OSV · GoEcosystem advisory · calculated8.9HighCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L
- NVDNIST5.4MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:NDiffers
EPSS trend
Probability
0.38%
Chance of exploitation in the next 30 days
Percentile
30%
Versus all other CVEs
30-day change
+0.03 pp
From 0.35% on 22-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundFilebrowser
Maturity: poc
Weaknesses
CWE · root causeAffected systems
Filebrowser1 product
- filebrowser≤ 1.2.9 | 1.2.1:stable | 1.3.0:beta
Github.com/gtsteffaniak1 product
- filebrowser< 0.0.0-20260307130210-09713b32a5f6
Gtsteffaniak1 product
- filebrowser≥ 1.3.0-beta, < 1.3.1-beta | < 1.2.2-stable
3 vendors · 3 products
References
6 links- github.com/gtsteffaniak/filebrowser/security/advisories/GHSA-r633-fcgp-m532X Refsource CONFIRMWEBAdvisoryExploitVendor Advisory
