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VulnerabilityPublished

CVE-2026-21854: the-hideout tarkov-data-manager · Improper Authentication

Affects the-hideout tarkov-data-managerSource CVE Database V5

0

Not known to be exploited · CVSS 9.8 Critical.

Data as of 26 Oct 2026, 17:16 UTC

CVSS 3.1 base score
9.8Critical
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.4% chance of exploitation in 30 days – higher than 39% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 7 Jan 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

What to do

Affected software

ProductAffectedFixed in
the-hideouttarkov-data-managerAffected
  • <=2.0.0
Fixed in–
GitHubthe-hideout/tarkov-data-managerpkg:github/the-hideout/tarkov-data-managerOther threatsAffected
  • <=2.0.0
Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

European organizations should immediately verify if they are running Tarkov Data Manager versions 2.0.0 or earlier and upgrade to the patched version released after 02 January 2025. If upgrading is not immediately possible, restrict network access to the Tarkov Data Manager admin panel using firewalls or VPNs to limit exposure to trusted users only. Implement strict monitoring and logging of access attempts to detect any unauthorized activity. Conduct code reviews and penetration testing focused on prototype pollution and authentication mechanisms in JavaScript-based applications. Educate development teams about the risks of loose equality checks and prototype pollution vulnerabilities to prevent similar issues in future software. Finally, maintain an incident response plan tailored to quickly address potential exploitation of this vulnerability.

Description

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.

References

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