How exploitable is this vulnerability in practice?

Exploitability is significant for any environment where untrusted or semi-trusted users can authenticate to Bugsink and access artifact bundle functionality. The impact depends on what directories are writable by the Bugsink process and how other components interact with the files that can be written or overwritten.

Does an attacker need special privileges to exploit this issue?

The attacker needs a valid authentication token for Bugsink, but no additional special privileges are implied by the description. Any authenticated user able to reach the artifact bundle assembly flow could potentially attempt to exploit the weakness.

What is the safest general fix pattern for this vulnerability class?

The most robust fix is to ensure that all file-write operations are based on server-controlled paths and naming schemes, with user input limited to non-sensitive metadata. All file-related input should be strictly validated and normalized, and the application should refuse to act on any values that escape designated directories or formats.

Severity:

HIGH RISK

(7.1)

Improper Input Validation (CWE-20) in Bugsink Artifact Bundle Assembly Allows Authenticated File Write

CVE-2026-40162

Published:

Apr 10, 2026

Status:

Received

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

CRITICAL RISK

CRITICAL

(9.8)

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

Remote Code Execution on the Router

April 12, 2026

CWE-77;CWE-78

CRITICAL RISK

CRITICAL

(9.8)

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

Remote Code Execution on the Router

April 12, 2026

Vulnerability Type

Category:

Improper Input Validation

CWE:

CWE-20

Impact:

Authenticated Arbitrary File Write within Application Context

Severity:

HIGH RISK

(7.1)

CVSS Version:

3.1

Vulnerability Type

Category:

Improper Input Validation

CWE:

CWE-20

Impact:

Authenticated Arbitrary File Write within Application Context

Severity:

HIGH RISK

(7.1)

CVSS Version:

3.1

Catch This CVE While Code Is Being Written

Detect vulnerable code directly in pull requests, so CVEs are fixed before merge.

Get Started

Ship clean & secure code faster

START 14 DAYS FREE TRIAL

BOOK A DEMO

Made with Love in San Francisco

355 Bryant St. San Francisco, CA 94107, USA

Ask AI for summary of CodeAnt

Made with Love in San Francisco

355 Bryant St. San Francisco, CA 94107, USA

Ask AI for summary of CodeAnt

Made with Love in San Francisco

355 Bryant St. San Francisco, CA 94107, USA

Ask AI for summary of CodeAnt

Improper Input Validation (CWE-20) in Bugsink Artifact Bundle Assembly Allows Authenticated File Write

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

CRITICAL RISK

CRITICAL

(9.8)

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

CRITICAL RISK

CRITICAL

(9.8)

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

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

Product

Pricing

Company

Legal

Developers

Compare

Product

Pricing

Company

Legal

Developers

Compare

Product

Pricing

Company

Legal

Developers

Compare