How broadly exploitable is this reflected XSS vulnerability?

Reflected XSS is typically exploitable wherever an attacker can convince users to click or load a crafted URL, such as through social engineering, embedded links, or malicious redirects. It does not require the attacker to control the server; they only need to influence the URL visited by the victim.

Does an attacker need an account or authentication to exploit this?

Usually, no direct authentication is needed to deliver a malicious link, but impact is greater when a victim is authenticated to the application while visiting the crafted URL. In that case, injected scripts run with the victim's authenticated session context.

What is the safest general fix pattern for this issue?

The most robust fix is to enforce context-aware output encoding for all untrusted data rendered into the page and to route all toast/notification messages through a hardened, text-only interface that refuses raw HTML or script content. This reduces opportunities for injection even if some input validation fails.

Severity:

CRITICAL RISK

(9.3)

Reflected Cross-Site Scripting (CWE-79) in Tarkov Data Manager Toast Notifications

CVE-2026-21855

Published:

Jan 7, 2026

Status:

Analyzed

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-306

CRITICAL RISK

CRITICAL

(9.8)

Missing Authentication for Forgot-Password Email Change API (CWE-306)

Account Takeover / Loss of Account Control

February 17, 2026

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in node-sonos-http-api TTS Provider for macOS

Remote Code Execution on the Server Host

February 17, 2026

Vulnerability Type

Category:

Cross-Site Scripting (XSS)

CWE:

CWE-79

Impact:

Arbitrary JavaScript Execution in Victim Browser

Severity:

CRITICAL RISK

(9.3)

CVSS Version:

3.1

Vulnerability Type

Category:

Cross-Site Scripting (XSS)

CWE:

CWE-79

Impact:

Arbitrary JavaScript Execution in Victim Browser

Severity:

CRITICAL RISK

(9.3)

CVSS Version:

3.1

Catch This CVE While Code Is Being Written

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Made with Love in San Francisco

355 Bryant St. San Francisco, CA 94107, USA

Ask AI for summary of CodeAnt

Reflected Cross-Site Scripting (CWE-79) in Tarkov Data Manager Toast Notifications

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

CRITICAL RISK

CRITICAL

(9.8)

Missing Authentication for Forgot-Password Email Change API (CWE-306)

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in node-sonos-http-api TTS Provider for macOS

Vulnerability Type

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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