Is this vulnerability remotely exploitable?

Yes. Any attacker with network access to the Tarkov Data Manager login endpoint can potentially exploit the issue, without prior authentication, if the vulnerable code is deployed.

What level of access does an attacker need to exploit this?

No valid credentials are required. The attacker only needs the ability to send crafted HTTP(S) requests to the affected login endpoint; the vulnerability arises entirely from server-side logic.

What is the safest general fix pattern for this issue?

The safest pattern is to redesign authentication logic to rely on well-defined, server-controlled identity and role state (sessions or signed tokens), using strict equality and strongly-typed checks, and ensuring that no security decisions depend on prototype-resolvable or user-controlled object properties.

Severity:

CRITICAL RISK

(9.8)

Authentication Bypass via Prototype Pollution and Loose Equality (CWE-287) in Tarkov Data Manager Login Endpoint

CVE-2026-21854

Published:

Jan 7, 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-306

CRITICAL RISK

CRITICAL

(9.8)

Missing Authentication for Forgot-Password Email Change API (CWE-306)

Account Takeover / Loss of Account Control

February 17, 2026

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in node-sonos-http-api TTS Provider for macOS

Remote Code Execution on the Server Host

February 17, 2026

Vulnerability Type

Category:

Authentication Bypass

CWE:

CWE-287;CWE-843;CWE-1321

Impact:

Privilege Escalation to Admin / Full Admin Compromise

Severity:

CRITICAL RISK

(9.8)

CVSS Version:

3.1

Vulnerability Type

Category:

Authentication Bypass

CWE:

CWE-287;CWE-843;CWE-1321

Impact:

Privilege Escalation to Admin / Full Admin Compromise

Severity:

CRITICAL RISK

(9.8)

CVSS Version:

3.1

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Made with Love in San Francisco

355 Bryant St. San Francisco, CA 94107, USA

Ask AI for summary of CodeAnt

Authentication Bypass via Prototype Pollution and Loose Equality (CWE-287) in Tarkov Data Manager Login 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

CRITICAL RISK

CRITICAL

(9.8)

Missing Authentication for Forgot-Password Email Change API (CWE-306)

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in node-sonos-http-api TTS Provider for macOS

Vulnerability Type

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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