CVE-2026-25890CWE-706CWE-863

File Browser has a Path-Based Access Control Bypass via Multiple Leading Slashes in URL

High · published February 9, 2026

CVSS v3.1
8.1
EPSS
1%
Percentile
48.6
In the wild
Unconfirmed
What it is

⚡ An authenticated user can easily slip past file path restrictions by just tweaking the request URL—like a clever party guest who sneaks through a side door! 🔥 Think of it as a restaurant that has a strict guest list but a sneaky diner who discovers that adding extra slashes to their name allows them to waltz in anyway, bypassing all security checks. The filesystem still lets them in, even when the guest list says 'no!' This vulnerability could allow an attacker to access sensitive files they shouldn't see—imagine a dinner where uninvited guests not only enjoy the meal but also sneak into the backroom to steal the recipes! It's a serious risk that could expose confidential information or lead to data manipulation.

Put simply

Think of it as a restaurant that has a strict guest list but a sneaky diner who discovers that adding extra slashes to their name allows them to waltz in anyway, bypassing all security checks. The filesystem still lets them in, even when the guest list says 'no!' The flaw in File Browser allows authenticated users to bypass authorization checks by manipulating the request URL with multiple slashes, causing the system to incorrectly validate access, thus granting unauthorized file retrieval.

What to do

This vulnerability could allow an attacker to access sensitive files they shouldn't see—imagine a dinner where uninvited guests not only enjoy the meal but also sneak into the backroom to steal the recipes! It's a serious risk that could expose confidential information or lead to data manipulation. To protect your system, upgrade to File Browser version 2.57.1 immediately. Additionally, conduct a thorough audit of file access controls to ensure other potential bypasses are blocked. Don't forget to educate your team on safe URL practices! You've got this! Implement these fixes and lock down your file access today! 🛡️

The record
Technical detail
CVSS v3.1
8.1 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.00611 · 48.6th percentile
Weaknesses
CWE-706 · Use of Incorrectly-Resolved Name or Reference; CWE-863 · Incorrect Authorization
Published
2026-02-09T21:21Z
EPSS history
Timeline
  • 09 FEB 21:21Z
    File Browser has a Path-Based Access Control Bypass via Multiple Leading Slashes in URL
    cvelistv5