Is this vulnerability remotely exploitable?

Yes. Any remote client that can authenticate and access the chunked upload endpoint can attempt to exploit the vulnerability over the network, provided they can send crafted multipart/form-data requests.

Does an attacker need special privileges or just a regular account?

The issue as described requires an authenticated user with upload capability. Whether this is a low-privilege or more restricted role depends on the Fireshare deployment and how accounts are managed.

What is the safest general fix pattern for this type of bug?

The safest pattern is to avoid using user-supplied data directly in filesystem paths. Instead, store uploads in a fixed directory using server-generated identifiers, enforce canonical path checks to keep all file operations within that directory, and reject any input that introduces path separators or traversal sequences.

Severity:

HIGH RISK

(7.1)

Authenticated Path Traversal (CWE-22) in Fireshare Chunked Upload Endpoint

CVE-2026-33645

Published:

Mar 26, 2026

Status:

Analyzed

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

Remote Code Execution on the Router

April 6, 2026

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Remote Code Execution on Router Firmware

April 6, 2026

Vulnerability Type

Category:

Path Traversal / Arbitrary File Write

CWE:

CWE-22;CWE-73

Impact:

Authenticated Arbitrary File Write

Severity:

HIGH RISK

(7.1)

CVSS Version:

3.1

Vulnerability Type

Category:

Path Traversal / Arbitrary File Write

CWE:

CWE-22;CWE-73

Impact:

Authenticated Arbitrary File Write

Severity:

HIGH RISK

(7.1)

CVSS Version:

3.1

Catch This CVE While Code Is Being Written

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355 Bryant St. San Francisco, CA 94107, USA

Ask AI for summary of CodeAnt

Authenticated Path Traversal (CWE-22) in Fireshare Chunked Upload Endpoint

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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