What is CVE-2026-21855?

CVE-2026-21855 is a critical-severity vulnerability in Tarkov Tarkov_data_manager, classified under Cross-site Scripting. CVSS score: 9.3/10. Published 2026-01-07.

How severe is CVE-2026-21855?

Critical severity. CVSS v3 base score is 9.3 out of 10.

XSS in Tarkov Tarkov_data_manager

CVE-2026-21855

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 co…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.002 (10.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.3 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N.

Affected products

Tarkov Tarkov_data_manager
The-hideout Tarkov-data-manager — versions <= 2.0.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)

Frequently asked questions

What is CVE-2026-21855?: CVE-2026-21855 is a critical-severity vulnerability in Tarkov Tarkov_data_manager, classified under Cross-site Scripting. CVSS score: 9.3/10. Published 2026-01-07.
How severe is CVE-2026-21855?: Critical severity. CVSS v3 base score is 9.3 out of 10.