CVE-2026-90930Public exploitNetwork attack vectorHinoki check available

Authenticated file disclosure and overwrite via symlink aliases

Published Sep 14, 2026 · Updated Sep 14, 2026

Access control bypass in File Browser 2.63.23 and earlier allows remote authenticated users to read or overwrite denied files via symlink aliases. The data.CheckRules path-rule check authorizes only the normalized lexical request path, while ScopedFs.within resolves the alias without reapplying rules to the target. Exploitation requires a pre-existing in-scope symbolic link to a denied target plus Download or Modify permission, and it does not cross the user's scope.

CVSS severity6.8
Medium
EPSS probability0.41%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Access control bypass in File Browser 2.63.23 and earlier allows remote authenticated users to read or overwrite denied files via symlink aliases. The data.CheckRules path-rule check authorizes only the normalized lexical request path, while ScopedFs.within resolves the alias without reapplying rules to the target. Exploitation requires a pre-existing in-scope symbolic link to a denied target plus Download or Modify permission, and it does not cross the user's scope.

The record

CVE
CVE-2026-90930
Published
Sep 14, 2026
Updated
Sep 14, 2026
Vendor
File Browser
Product
File Browser
Classifications
CWE-59, CAPEC-132, T1005, T1565.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 14, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=2.63.23

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

File Browser · File Browserversion=0 <=2.63.23

Published CVSS scores

6.8GitHub Security AdvisoryCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-59Improper Link Resolution Before File Access ('Link Following')
CAPEC-132Symlink Attack
T1005Data from Local System
T1565.001Stored Data Manipulation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo