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CVE-2026-21855— Tarkov Data Manager has Unauthenticated Reflected XSS

Quick assessment

Affected
the-hideout tarkov-data-manager
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Tarkov Data Manager是The Hideout开源的一个数据库管理工具。 Tarkov Data Manager 2025年01月02日之前版本存在跨站脚本漏洞，该漏洞源于toast通知系统存在反射型跨站脚本，可能导致攻击者在受害者浏览器环境中执行任意JavaScript。

CVSS 9.3 · Critical EPSS 0.24% · P14
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I. Basic Information for CVE-2026-21855

Vulnerability Information
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Vulnerability Title
Tarkov Data Manager has Unauthenticated Reflected XSS
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Tarkov Data Manager 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Tarkov Data Manager是The Hideout开源的一个数据库管理工具。 Tarkov Data Manager 2025年01月02日之前版本存在跨站脚本漏洞，该漏洞源于toast通知系统存在反射型跨站脚本，可能导致攻击者在受害者浏览器环境中执行任意JavaScript。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
the-hideout tarkov-data-manager <= 2.0.0 -

II. Public POCs for CVE-2026-21855

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III. Intelligence Information for CVE-2026-21855

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Vendor Advisories for CVE-2026-21855 (1)

Same Patch Batch · the-hideout · 2026-01-07 · 3 CVEs total

CVE-2026-21854 9.8 CRITICAL Tarkov Data Manager Authentication Bypass vulnerability
CVE-2026-21856 7.2 HIGH Tarkov Data Manager has Authenticated SQL Injection

IV. Related Vulnerabilities

Same product: tarkov-data-manager
Same vendor: the-hideout
Same weakness: CWE-79

V. Comments for CVE-2026-21855

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