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Tarkov Data Manager CVE-2026-21854

CRITICAL
Improper Authentication (CWE-287)
2026-01-07 security-advisories@github.com
Authentication Bypass Tarkov Data Manager
9.8
CVSS 3.1 · GitHub Advisory
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Severity by source

GitHub Advisory PRIMARY
9.8 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

3
Analysis Generated
Mar 12, 2026 - 21:54 vuln.today
Patch released
Feb 03, 2026 - 16:21 nvd
Patch available
CVE Published
Jan 07, 2026 - 19:15 nvd
CRITICAL 9.8

DescriptionGitHub Advisory

The Tarkov Data Manager is a tool to manage the Tarkov item data. Prior to 02 January 2025, an authentication bypass vulnerability in the login endpoint allows any unauthenticated user to gain full admin access to the Tarkov Data Manager admin panel by exploiting a JavaScript prototype property access vulnerability, combined with loose equality type coercion. A series of fix commits on 02 January 2025 fixed this and other vulnerabilities.

AnalysisAI

Tarkov Data Manager's login endpoint can be bypassed using JavaScript prototype property access combined with loose equality type coercion. Any unauthenticated user can gain full admin access. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Send crafted JSON request to login endpoint
Exploit
Exploit prototype pollution via property access
Execution
Bypass authentication checks through type coercion
Impact
Gain unauthorized admin panel access
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Vulnerability AssessmentAI

Exploitation Tarkov Data Manager versions prior to 02 January 2025 with default authentication enabled. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment CVSS 9.8 (Critical). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker sends a login request with a carefully crafted password object that exploits prototype property access. The loose equality check returns true, granting admin access without knowing any credentials.
Remediation Update to the latest version. … Detailed patch versions, workarounds, and compensating controls in full report.
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Within 24 hours: Identify all affected systems and apply vendor patches immediately. …

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CVE-2026-21854 vulnerability details – vuln.today
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