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CVE-2026-21855

Tarkov Data Manager cross-site scripting (XSS)

9.3 CRITICALPublic exploitEPSS 0.24%
  1. Published7 Jan 2026

Description

The Tarkov Data Manager is a tool to manage the Tarkov item data. Prior to 02 January 2025, a reflected Cross Site Scripting (XSS) vulnerability in the toast notification system allows any attacker to execute arbitrary JavaScript in the context of a victim's browser session by crafting a malicious URL. A series of fix commits on 02 January 2025 fixed this and other vulnerabilities.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionRequired
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N

Affected products

Tarkov Data Manager< 2025-01-02

Remediation

Fixed in
Tarkov Data Manager≥ 2025-01-02

References

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Frequently asked

Is CVE-2026-21855 being actively exploited?

CVE-2026-21855 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.24%.

How severe is CVE-2026-21855?

CVE-2026-21855 has a CVSS 3.1 base score of 9.3, rated critical. EPSS estimates a 0.24% probability of exploitation.

Which products are affected by CVE-2026-21855?

Affected products include Tarkov Data Manager.

How do I fix CVE-2026-21855?

Upgrade affected software to a fixed version, for example Tarkov Data Manager 2025-01-02 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-21855 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.