CVE-2026-33244: React Router is a router for React

Q: How do I fix CVE-2026-33244?

react-router: upgrade to 7.13.2. Exact commands for each OS are on this page.

Q: Is CVE-2026-33244 being exploited?

CVE-2026-33244 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-33244 affect?

CVE-2026-33244 affects react-router. Severity is medium (CVSS 5.4). React Router is a router for React. In versions 7.5.1 through 7.13.1, when using Framework Mode with pre-rendering enabled, improper neutralization of the HTTP `Location` header value can permit Cross-Site Scripting (XSS) in the statically

Q: How urgent is CVE-2026-33244?

Priority 20/100. No elevated risk signals yet.

Routine

MEDIUM 5.4UPGRADE

CVE-2026-33244 is a medium-severity flaw (CVSS 5.4) affecting react-router. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

React Router is a router for React. In versions 7.5.1 through 7.13.1, when using Framework Mode with pre-rendering enabled, improper neutralization of the HTTP `Location` header value can permit Cross-Site Scripting (XSS) in the statically generated HTML files if the redirect location comes from an untrusted source. This does not impact applications using Declarative Mode (`<BrowserRouter>`) or Data Mode (`createBrowserRouter/<RouterProvider>`).

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.1% (top 96%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-06-02
Last modified	2026-07-21

Publisher (CNA): GitHub, Inc. · Vendor: shopify

Last updated 2026-07-21 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-02 17:16 UTCPublished CVE record published
2026-07-21 19:10 UTCUpdated Record last modified

shopify react-router UPGRADE

Affected: >= 7.5.1 and < 7.13.2

Fixed in: 7.13.2

Safe to downgrade to: a release before 7.5.1

1. Check installed version

npm ls react-router

2. UPGRADE to 7.13.2

npm install react-router@">=7.13.2"

3. If no update is available yet, DOWNGRADE to a release before 7.5.1

npm view react-router versions npm install react-router@"<7.5.1"

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-33244?

react-router: upgrade to 7.13.2. Exact commands for each OS are on this page.

Is CVE-2026-33244 being exploited?

CVE-2026-33244 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-33244 affect?

CVE-2026-33244 affects react-router. Severity is medium (CVSS 5.4). React Router is a router for React. In versions 7.5.1 through 7.13.1, when using Framework Mode with pre-rendering enabled, improper neutralization of the HTTP `Location` header value can permit Cross-Site Scripting (XSS) in the statically

How urgent is CVE-2026-33244?

Priority 20/100. No elevated risk signals yet.

Software pages

React vulnerabilities · Shopify vulnerabilities

Related CVEs

CVE-2026-55685 HIGH 7.5 UPGRADE React Router is a router for React
CVE-2026-53667 MEDIUM 6.9 UPGRADE React Router is a router for React
CVE-2026-53668 MEDIUM 6.9 UPGRADE React Router is a router for React
CVE-2026-53666 MEDIUM 6.1 UPGRADE React Router is a router for React
CVE-2026-53669 MEDIUM 6.1 UPGRADE React Router is a router for React

References

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