CVE-2026-53667: React Router is a router for React. In versions 7.11.0 through 7.17.0, the RSCErrorHandler is missing protocol validation, allowing for redirects from untrusted sources. This issue

mediumCVSS 6.9CVE-2026-53667

React Router is a router for React. In versions 7.11.0 through 7.17.0, the RSCErrorHandler is missing protocol validation, allowing for redirects from untrusted sources. This issue is a follow up to CVE-2026-53667, and only affects consuming applications if they are using the unstable RSC APIs. This issue has been fixed in version 7.18.0.

Details

Source: NVD Recent CVEs (US · database · site)
Severity: medium — CVSS 6.9
Published: 2026-07-27
Last updated: 2026-07-28
Exploitation: Not in CISA KEV at last sync

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-53667

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-536670.35% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 28% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-53667	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

mediumGHSA-h8fp-f39c-q6mh: React Router: RSCErrorHandler Missing Protocol Validation (XSS)ghsa

Recent advisories for React Router is

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

unknownCVE-2026-55685: React Router is a router for React. In versions 7.0.0 through 7.17.0, the manifest endpoint co…nvd · 2026-07-27
unknownCVE-2026-53669: React Router is a router for React. Versions 6.0.0 through 7.17.0 are vulnerable to Open Redir…nvd · 2026-07-27
mediumCVE-2026-53668: React Router is a router for React. In versions 6.30.2 through 6.30.4 and 7.9.6 through 7.12.0…nvd · 2026-07-27
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