What is CVE-2026-30934?

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/ 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.

How severe is CVE-2026-30934?

CVE-2026-30934 has a CVSS 3.x base score of 8.9, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity high, and availability low.

Is CVE-2026-30934 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-30934?

CVE-2026-30934 primarily affects Filebrowser. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-30934?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-30934 have an EU (EUVD) identifier?

Yes. CVE-2026-30934 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-10545.

When was CVE-2026-30934 published?

CVE-2026-30934 was published on 2026-03-10 and last updated on 2026-06-17.

CVE-2026-30934

CVE-2026-30934 is a high-severity vulnerability in Filebrowser with a CVSS 3.x base score of 8.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: High (CVSS 3.x base score 8.9)
EPSS exploit prediction: 0% (27th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-10545
Weakness: CWE-79
Affected product: Filebrowser
Published: 2026-03-10
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-30934?: 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.
How severe is CVE-2026-30934?: CVE-2026-30934 has a CVSS 3.x base score of 8.9, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity high, and availability low.
Is CVE-2026-30934 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-30934?: CVE-2026-30934 primarily affects Filebrowser. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-30934?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-30934 have an EU (EUVD) identifier?: Yes. CVE-2026-30934 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-10545.
When was CVE-2026-30934 published?: CVE-2026-30934 was published on 2026-03-10 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:a:filebrowser:filebrowser:*:*:*:*:*:*:*:*
cpe:2.3:a:filebrowser:filebrowser:1.2.1:stable:*:*:*:*:*:*
cpe:2.3:a:filebrowser:filebrowser:1.3.0:beta:*:*:*:*:*:*

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