CVE-2026-21855: The Tarkov Data Manager is a tool to manage the Tarkov item data

Q: How do I fix CVE-2026-21855?

tarkov data manager: upgrade to 2025-01-02. Exact commands for each OS are on this page.

Q: Is CVE-2026-21855 being exploited?

CVE-2026-21855 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-21855 affect?

CVE-2026-21855 affects tarkov data manager. Severity is critical (CVSS 9.3). 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 con

Q: How urgent is CVE-2026-21855?

Priority 41/100. Critical severity; Public exploit reference

This month

CRITICAL 9.3UPGRADE

CVE-2026-21855 is a critical-severity flaw (CVSS 9.3) affecting tarkov data manager. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Critical severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	9.3 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 85%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-01-07
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: tarkov

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-01-07 19:15 UTCPublished CVE record published
2026-06-17 10:19 UTCUpdated Record last modified

tarkov tarkov data manager UPGRADE

Affected: < 2025-01-02

Fixed in: 2025-01-02

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy tarkov-data-manager || rpm -q tarkov-data-manager || tarkov-data-manager --version

2. UPGRADE to 2025-01-02 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade tarkov-data-manager

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade tarkov-data-manager

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-21855?

tarkov data manager: upgrade to 2025-01-02. Exact commands for each OS are on this page.

Is CVE-2026-21855 being exploited?

CVE-2026-21855 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-21855 affect?

CVE-2026-21855 affects tarkov data manager. Severity is critical (CVSS 9.3). 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 con

How urgent is CVE-2026-21855?

Priority 41/100. Critical severity; Public exploit reference

Related CVEs

CVE-2026-21856 HIGH 7.2 UPGRADE The Tarkov Data Manager is a tool to manage the Tarkov item data
CVE-2026-21854 CRITICAL 9.8 UPGRADE The Tarkov Data Manager is a tool to manage the Tarkov item data

References

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