What is the CVSS score of CVE-2026-21884?

CVE-2026-21884 has a CVSS 3.1 base score of 8.2 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N. EPSS exploitation probability: 0.0%.

Which versions of React Router are affected by CVE-2026-21884?

Organizations using React Router face notable risk from CVE-2026-21884, a cross-site scripting vulnerability rated CVSS 8.2.. A patch is available.

How to fix or mitigate CVE-2026-21884?

Within 7 days: Identify all affected systems and apply vendor patches promptly. Verify anti-CSRF tokens and content security policies are enforced.

React Router CVE-2026-21884

HIGH

Cross-site Scripting (XSS) (CWE-79)

2026-01-10 security-advisories@github.com

GHSA-8v8x-cx79-35w7

XSS React Router Remix Run React

8.2

CVSS 3.1 · Vendor: github

Severity by source

Vendor (github) PRIMARY

8.2 HIGH

AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N

SUSE

HIGH

qualitative

Red Hat

8.2 HIGH

qualitative

Primary rating from Vendor (github).

CVSS VectorVendor: github

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

High

Integrity

Low

Availability

None

Lifecycle Timeline

Patch released

Mar 31, 2026 - 21:13 nvd

Patch available

Analysis Generated

Mar 12, 2026 - 21:54 vuln.today

CVE Published

Jan 10, 2026 - 03:15 nvd

HIGH 8.2

Blast Radius

ecosystem impact

† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth

1 npm packages depend on @remix-run/react (1 direct, 0 indirect)
6 npm packages depend on react-router (3 direct, 3 indirect)

Ecosystem-wide dependent count for version 2.17.3 and other introduced versions.

DescriptionCVE.org

React Router is a router for React. In @remix-run/react version prior to 2.17.3. and react-router 7.0.0 through 7.11.0, a XSS vulnerability exists in in React Router's <ScrollRestoration> API in Framework Mode when using the getKey/storageKey props during Server-Side Rendering which could allow arbitrary JavaScript execution during SSR if untrusted content is used to generate the keys. There is no impact if server-side rendering in Framework Mode is disabled, or if Declarative Mode (<BrowserRouter>) or Data Mode (createBrowserRouter/<RouterProvider>) is being used. This issue has been patched in @remix-run/react version 2.17.3 and react-router version 7.12.0.

AnalysisAI

React Router is a router for React. In @remix-run/react version prior to 2.17.3. [CVSS 8.2 HIGH]

Technical ContextAI

Classified as CWE-79 (Cross-site Scripting (XSS)). Affects React-Router. React Router is a router for React. In @remix-run/react version prior to 2.17.3. and react-router 7.0.0 through 7.11.0, a XSS vulnerability exists in in React Router's <ScrollRestoration> API in Framework Mode when using the getKey/storageKey props during Server-Side Rendering which could allow arbitrary JavaScript execution during SSR if untrusted content is used to generate the keys. There is no impact if server-side rendering in Framework Mode is disabled, or if Declarative Mode (<BrowserRout

RemediationAI

Monitor vendor advisories for a patch. Implement output encoding and Content Security Policy headers. Restrict network access to the affected service where possible.

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7.5 Jun 02

Denial of service in React Router 7.0.0-7.14.x and @remix-run/server-runtime 2.10.0-2.17.4 allows remote unauthenticated

CVE-2026-34077 HIGH This Week POC

7.5 Jun 02

Client-side Cross-Site Scripting in React Router 7.7.0 through 7.13.1 affects applications using the unstable React Serv

CVE-2026-33245 HIGH This Week

8.0 Jun 02

Client-side cross-site scripting in React Router 7.7.0 through 7.13.1 allows remote attackers to execute arbitrary scrip

CVE-2025-59057 HIGH This Week

7.6 Jan 10

React Router is a router for React. In @remix-run/react versions 1.15.0 through 2.17.0. [CVSS 7.6 HIGH]

CVE-2025-68470 MEDIUM This Month

6.5 Jan 10

React-Router versions up to 6.30.1 is affected by url redirection to untrusted site (open redirect) (CVSS 6.5).

CVE-2026-22030 MEDIUM This Month

6.5 Jan 10

React Router is a router for React. In @remix-run/server-runtime version prior to 2.17.3. [CVSS 6.5 MEDIUM]

CVE-2026-22029 MEDIUM This Month

6.1 Jan 10

React Router is a router for React. In @remix-run/router version prior to 1.23.2. [CVSS 8.0 HIGH]

Same weakness CWE-79 – Cross-site Scripting (XSS)

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CVE-2013-7389 MEDIUM POC

4.3

CVE-2021-25299 MEDIUM POC

6.1

CVE-2014-2120 MEDIUM

6.1

CVE-2023-40000 HIGH POC

8.3

CVE-2016-8581 MEDIUM POC

6.1

CVE-2013-5223 MEDIUM POC

5.4

CVE-2025-52367 MEDIUM POC

5.4

CVE-2015-0072 MEDIUM POC

4.3

Same technique XSS

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CVE-2017-9248 CRITICAL POC

9.8

CVE-2013-1710 CRITICAL POC

10.0

CVE-2013-7389 MEDIUM POC

4.3

CVE-2021-25299 MEDIUM POC

6.1

CVE-2014-2120 MEDIUM

6.1

CVE-2023-40000 HIGH POC

8.3

CVE-2024-52875 HIGH POC

8.8

CVE-2016-8581 MEDIUM POC

6.1

Vendor StatusVendor

SUSE

Severity: High

Product	Status
SUSE Linux Enterprise Module for Package Hub 15 SP7	Fixed
SUSE Linux Enterprise Module for SAP Applications 15 SP7	Fixed
SUSE Linux Enterprise Server 16.0	Fixed
SUSE Linux Enterprise Server 16.0	Fixed
SUSE Linux Enterprise Server 16.1	Fixed

CVE-2026-21884 vulnerability details – vuln.today

Back

SUSE Linux Enterprise Server for SAP Applications 15 SP7	Fixed
SUSE Linux Enterprise Server for SAP applications 16.0	Fixed
SUSE Linux Enterprise Server for SAP applications 16.0	Fixed
SUSE Linux Enterprise Server for SAP applications 16.0	Fixed
SUSE Linux Enterprise Server for SAP applications 16.1	Fixed
SUSE Linux Enterprise Server for SAP applications 16.1	Fixed
SUSE Manager Client Tools 15	Fixed
SUSE Manager Client Tools for SLE 12	Fixed
SUSE Manager Client Tools for SLE 15	Fixed
SUSE Multi-Linux Manager Client Tools for SLE 12	Fixed
SUSE Multi-Linux Manager Client Tools for SLE 15	Fixed
openSUSE Leap 15.6	Fixed
SUSE Linux Enterprise Server for SAP Applications 15 SP6	Fixed
SUSE Manager Proxy LTS 4.3	Fixed
SUSE Manager Proxy Module 4.3	Fixed
SUSE Enterprise Storage 6	Fixed
SUSE Linux Enterprise Module for Package Hub 15 SP5	Fixed
SUSE Linux Enterprise Module for Package Hub 15 SP6	Fixed
SUSE Linux Enterprise Module for SAP Applications 15 SP3	Fixed
SUSE Linux Enterprise Module for SAP Applications 15 SP4	Fixed
SUSE Linux Enterprise Module for SAP Applications 15 SP5	Fixed
SUSE Linux Enterprise Module for SAP Applications 15 SP6	Fixed
SUSE Linux Enterprise Server for SAP Applications 15 SP3	Fixed
SUSE Linux Enterprise Server for SAP Applications 15 SP4	Fixed
SUSE Linux Enterprise Server for SAP Applications 15 SP5	Fixed
SUSE Manager Proxy Module 4.1	Fixed
SUSE Manager Proxy Module 4.2	Fixed
openSUSE Leap 15.3	Fixed
openSUSE Leap 15.4	Fixed
openSUSE Leap 15.5	Fixed
SUSE Multi Linux Manager Tools SLE-15	Fixed

React Router CVE-2026-21884

Severity by source

CVSS VectorVendor: github

Lifecycle Timeline

Blast Radius

DescriptionCVE.org

AnalysisAI

Technical ContextAI

RemediationAI

More in React Router

Same weakness CWE-79 – Cross-site Scripting (XSS)

Same technique XSS

Vendor StatusVendor

SUSE

Share

External POC / Exploit Code