How severe is CVE-2026-34528?

CVE-2026-34528 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-34528 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-34528?

CVE-2026-34528 affects Filebrowser. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-34528?

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-2026-34528 have an EU (EUVD) identifier?

Yes. CVE-2026-34528 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-18050.

When was CVE-2026-34528 published?

CVE-2026-34528 was published on 2026-04-01 and last updated on 2026-06-17.

CVE-2026-34528

CVE-2026-34528 is a high-severity vulnerability in Filebrowser with a CVSS 3.x base score of 8.1. 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-269.

Key facts

Severity: High (CVSS 3.x base score 8.1)
EPSS exploit prediction: 1% (47th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-18050
Weakness: CWE-269
Affected product: Filebrowser
Published: 2026-04-01
Last modified: 2026-06-17

Description

File Browser is a file managing interface for uploading, deleting, previewing, renaming, and editing files within a specified directory. Prior to version 2.62.2, the signupHandler in File Browser applies default user permissions via d.settings.Defaults.Apply(user), then strips only Admin. The Execute permission and Commands list from the default user template are not stripped. When an administrator has enabled signup, server-side execution, and set Execute=true in the default user template, any unauthenticated user who self-registers inherits shell execution capabilities and can run arbitrary commands on the server. This issue has been patched in version 2.62.2.

Frequently asked questions

What is CVE-2026-34528?: File Browser is a file managing interface for uploading, deleting, previewing, renaming, and editing files within a specified directory. Prior to version 2.62.2, the signupHandler in File Browser applies default user permissions via d.settings.Defaults.Apply(user), then strips only Admin. The Execute permission and Commands list from the default user template are not stripped. When an administrator has enabled signup, server-side execution, and set Execute=true in the default user template, any unauthenticated user who self-registers inherits shell execution capabilities and can run arbitrary commands on the server. This issue has been patched in version 2.62.2.
How severe is CVE-2026-34528?: CVE-2026-34528 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-34528 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-34528?: CVE-2026-34528 affects Filebrowser. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-34528?: 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-2026-34528 have an EU (EUVD) identifier?: Yes. CVE-2026-34528 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-18050.
When was CVE-2026-34528 published?: CVE-2026-34528 was published on 2026-04-01 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:filebrowser:filebrowser:*:*:*:*:*:*:*:*

More vulnerabilities in Filebrowser

CVE-2026-32760 — Critical (CVSS 9.8): File Browser is a file managing interface for uploading, deleting, previewing, renaming, and editing files within a…
CVE-2025-53826 — Critical (CVSS 9.8): File Browser provides a file managing interface within a specified directory and it can be used to upload, delete,…
CVE-2026-29188 — Critical (CVSS 9.1): File Browser provides a file managing interface within a specified directory and it can be used to upload, delete,…
CVE-2023-39612 — Critical (CVSS 9.0): A cross-site scripting (XSS) vulnerability in FileBrowser before v2.23.0 allows an authenticated attacker to escalate…
CVE-2026-30934 — High (CVSS 8.9): 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…
CVE-2025-64523 — High (CVSS 8.8): File Browser provides a file managing interface within a specified directory and it can be used to upload, delete,…

All CVEs affecting Filebrowser →

Other CWE-269 (Improper Privilege Management) vulnerabilities

CVE-2026-31852 — Critical (CVSS 10.0): Jellyfin is an open-source media system. The code-quality.yml GitHub Actions workflow in jellyfin/jellyfin-ios is…
CVE-2025-20282 — Critical (CVSS 10.0): A vulnerability in an internal API of Cisco ISE and Cisco ISE-PIC could allow an unauthenticated, remote attacker to…
CVE-2025-0505 — Critical (CVSS 10.0): On Arista CloudVision systems (virtual or physical on-premise deployments), Zero Touch Provisioning can be used to gain…
CVE-2023-48418 — Critical (CVSS 10.0): In checkDebuggingDisallowed of DeviceVersionFragment.java, there is a possible way to access adb before SUW…
CVE-2023-48419 — Critical (CVSS 10.0): An attacker in the wifi vicinity of a target Google Home can spy on the victim, resulting in Elevation of Privilege
CVE-2023-31273 — Critical (CVSS 10.0): Protection mechanism failure in some Intel DCM software before version 5.2 may allow an unauthenticated user to…

Browse all CWE-269 (Improper Privilege Management) vulnerabilities →