Vulnerability · Published Jan 7, 2026 · Assigned by GitHub_M
CVE-2026-21855Tarkov Data Manager has Unauthenticated Reflected XSS
Critical 9.3
In plain English
A critical-severity cross-site scripting in tarkov-data-manager from the-hideout. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 15% of all known vulnerabilities).
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| the-hideout | tarkov-data-manager | <= 2.0.0 |
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N