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CVE-2026-25890

Filebrowser broken access control

8.1 HIGHPublic exploitEPSS 0.61%
  1. Published9 Feb 2026

Description

File Browser provides a file managing interface within a specified directory and it can be used to upload, delete, preview, rename and edit files. Prior to 2.57.1, an authenticated user can bypass the application's "Disallow" file path rules by modifying the request URL. By adding multiple slashes (e.g., //private/) to the path, the authorization check fails to match the rule, while the underlying filesystem resolves the path correctly, granting unauthorized access to restricted files. This vulnerability is fixed in 2.57.1.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Affected products

Filebrowser< 2.57.1

Remediation

Fixed in
Filebrowser≥ 2.57.1

References

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Frequently asked

Is CVE-2026-25890 being actively exploited?

CVE-2026-25890 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.61%.

How severe is CVE-2026-25890?

CVE-2026-25890 has a CVSS 3.1 base score of 8.1, rated high. EPSS estimates a 0.61% probability of exploitation.

Which products are affected by CVE-2026-25890?

Affected products include Filebrowser.

How do I fix CVE-2026-25890?

Upgrade affected software to a fixed version, for example Filebrowser 2.57.1 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-25890 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.