Is this vulnerability remotely exploitable over the internet?

Yes. If attacker-controlled input can influence the `getKey` or `storageKey` values during SSR in Framework Mode, the attacker can exploit the issue remotely by crafting requests that cause malicious keys to be included in the rendered HTML.

Does exploiting this require authentication or special privileges?

Not necessarily. If the application uses unauthenticated routes where request parameters or headers are used to derive scroll restoration keys, exploitation can be fully unauthenticated. In other deployments, the attacker may need an account or some level of access to control the data that flows into these props.

What is the safest general fix pattern for affected applications?

The safest pattern is to ensure that scroll restoration keys are

Severity:

HIGH RISK

(8.2)

Cross-Site Scripting (CWE-79) in React Router <ScrollRestoration> Framework Mode SSR

CVE-2026-21884

Published:

Jan 9, 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-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

Remote Code Execution on the Router

April 6, 2026

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Remote Code Execution on Router Firmware

April 6, 2026

Vulnerability Type

Category:

Cross-Site Scripting (XSS)

CWE:

CWE-79

Impact:

Client-Side Code Execution / Cross-Site Scripting

Severity:

HIGH RISK

(8.2)

CVSS Version:

3.1

Vulnerability Type

Category:

Cross-Site Scripting (XSS)

CWE:

CWE-79

Impact:

Client-Side Code Execution / Cross-Site Scripting

Severity:

HIGH RISK

(8.2)

CVSS Version:

3.1

Catch This CVE While Code Is Being Written

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Ask AI for summary of CodeAnt

Cross-Site Scripting (CWE-79) in React Router <ScrollRestoration> Framework Mode SSR

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

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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