How severe is CVE-2026-21854?

CVE-2026-21854 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-21854 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-21854?

CVE-2026-21854 affects Tarkov Tarkov Data Manager. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-21854?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-21854 have an EU (EUVD) identifier?

Yes. CVE-2026-21854 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-1399.

When was CVE-2026-21854 published?

CVE-2026-21854 was published on 2026-01-07 and last updated on 2026-06-17.

CVE-2026-21854

CVE-2026-21854 is a critical-severity vulnerability in Tarkov Tarkov Data Manager with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-287.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 0% (32nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-1399
Weakness: CWE-287
Affected product: Tarkov Tarkov Data Manager
Published: 2026-01-07
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-21854?: 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.
How severe is CVE-2026-21854?: CVE-2026-21854 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-21854 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-21854?: CVE-2026-21854 affects Tarkov Tarkov Data Manager. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-21854?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-21854 have an EU (EUVD) identifier?: Yes. CVE-2026-21854 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-1399.
When was CVE-2026-21854 published?: CVE-2026-21854 was published on 2026-01-07 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:tarkov:tarkov_data_manager:*:*:*:*:*:*:*:*

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Other CWE-287 (Improper Authentication) vulnerabilities

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CVE-2026-10611 — Critical (CVSS 10.0): An authentication bypass vulnerability exists in MISP when LDAP mixed authentication is enabled with OTP enforcement.…
CVE-2026-47280 — Critical (CVSS 10.0): Improper authentication in Azure Resource Manager (ARM) allows an unauthorized attacker to elevate privileges over a…
CVE-2026-42822 — Critical (CVSS 10.0): Improper authentication in Azure Local Disconnected Operations allows an unauthorized attacker to elevate privileges…
CVE-2026-20182 — Critical (CVSS 10.0): May 2026: This security advisory provides the details and fix information for a vulnerability that was discovered and…

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