How broadly exploitable is this vulnerability?

Any unauthenticated user who can reach the `/api/uploadChunked/public` endpoint over the network can attempt exploitation. No valid user account or prior compromise is required, though the attacker is constrained by the filesystem permissions of the Fireshare process.

Does an attacker need local access to the server?

No local access is required. Exploitation occurs entirely over HTTP(S) by sending crafted upload requests. The server-side code performs the file writes based on untrusted parameters in those requests.

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

Centralize and harden upload handling by confining all file writes to a dedicated directory, using server-generated filenames, and enforcing strict canonicalization and directory-escape checks. Ensure that this hardened path is reused across both authenticated and public endpoints.

Severity:

CRITICAL RISK

(9.1)

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

CVE-2026-34745

Published:

Apr 2, 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

Impact:

Arbitrary File Write Leading to Potential Remote Code Execution or Data Compromise

Severity:

CRITICAL RISK

(9.1)

CVSS Version:

3.1

Vulnerability Type

Category:

Path Traversal / Arbitrary File Write

CWE:

CWE-22

Impact:

Arbitrary File Write Leading to Potential Remote Code Execution or Data Compromise

Severity:

CRITICAL RISK

(9.1)

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

Path Traversal (CWE-22) in Fireshare Public 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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