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Fencer Vulns
high 8.0

CVE-2026-33245 json

React Router vulnerable to XSS in unstable RSC redirect handling via javascript: redirect targets

published 2026-06-02 5 mo ago modified 2026-07-22 3 mo ago also EUVD-2026-33988 , GHSA-8646-j5j9-6r62

cvss
8.0
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 8%
public exploits
0
none known

Summary

React Router is a router for React. In versions 7.7.0 through 7.13.1, when using React Router's unstable React Server Components (RSC) APIs, there is a potential client-side Cross-Site Scripting (XSS) vulnerability in the RSC redirect handling if redirects come from untrusted sources. This does not impact applications that are not using the unstable RSC APIs in React Router. This is patched in version 7.13.2.

Patch / fix

  • npm react-router 7.13.2
  • shopify react-router 7.13.2
  • agama-web-ui openSUSE Tumbleweed 24+0.a836cced5-52.1

opensuse advisories openSUSE-SU-2026:11680-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-33245 updated cvss 4.2

react-router: React Router: Cross-Site Scripting vulnerability via untrusted React Server Component redirects

  • Red Hat Exploit Intelligence exploit-intelligence-tech-preview/agent-client-rhel9 Red Hat Migration Toolkit for Applications 8 mta/mta-ui-rhel8, mta/mta-ui-rhel9 Red Hat Migration Toolkit for Containers rhmtc/openshift-migration-ui-rhel8
    affected: workaround, no fix available
  • Red Hat Migration Toolkit for Virtualization mtv-candidate/mtv-console-plugin-rhel9, migration-toolkit-virtualization/mtv-console-plugin-rhel9
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Network Observability Operator network-observability/network-observability-console-plugin-rhel9, network-observability/network-observability-console-plugin-compat-rhel9 Red Hat Node HealthCheck Operator workload-availability/node-healthcheck-rhel9-operator, workload-availability/node-healthcheck-operator-bundle, workload-availability/node-healthcheck-must-gather-rhel9
    affected: workaround, no fix available
  • Red Hat OpenShift Lightspeed openshift-lightspeed/lightspeed-console-plugin-rhel9, openshift-lightspeed/lightspeed-console-plugin-419-rhel9, openshift-lightspeed/lightspeed-console-plugin-pf5-rhel9 Red Hat OpenShift Pipelines openshift-pipelines/pipelines-hub-ui-rhel8, openshift-pipelines/pipelines-hub-ui-rhel9, openshift-pipelines/pipelines-console-plugin-rhel8, openshift-pipelines/pipelines-console-plugin-rhel9, openshift-pipelines/pipelines-console-plugin-pf5-rhel9
    affected: workaround, no fix available, no fix planned “Will not fix”
  • Red Hat OpenShift Service Mesh 2 openshift-service-mesh/kiali-rhel8, openshift-service-mesh/kiali-ossmc-rhel8 Red Hat Advanced Cluster Management for Kubernetes 2 redhat-user-workloads/crt-redhat-acm-tenant/release-acm-212/console-acm-212
    affected: workaround, no fix available
  • Red Hat Ansible Automation Platform 2 automation-hub, automation-gateway, automation-controller, automation-platform-ui, automation-eda-controller, ansible-automation-platform-26/gateway-rhel9, +2 more
    affected: workaround, no fix available, no fix planned “Will not fix”
  • Red Hat build of Apache Camel - HawtIO 4 react-router Red Hat build of Apicurio Registry 2 react-router Red Hat build of Apicurio Registry 3 apicurio/apicurio-registry-ui-rhel8, apicurio/apicurio-registry-ui-rhel9 Red Hat Build of Keycloak react-router Red Hat Build of Podman Desktop rh-podman-desktop.git Red Hat Ceph Storage 5 rhceph/rhceph-5-dashboard-rhel8
    +1 more products
    Red Hat Ceph Storage 9 rhceph/alloy-rhel10
    affected: workaround, no fix available
  • Red Hat Edge Manager 1 rhem/flightctl-ui-rhel9, rhem/flightctl-ui-rhel10, rhem/flightctl-ui-ocp-rhel9, rhem/flightctl-ui-ocp-rhel10
    affected: workaround, no fix planned “Will not fix”
show 10 more
  • Red Hat Enterprise Linux 8 thunderbird, cockpit-composer Red Hat Fuse 7 react-router Red Hat OpenShift Container Platform 4 openshift4/ose-console, openshift4/ose-console-rhel9, openshift4/ose-monitoring-plugin-rhel8, openshift4/ose-prometheus-alertmanager-rhel9, redhat-user-workloads/ocp-art-tenant/art-images Red Hat OpenShift Container Platform 5 openshift5/ose-console-rhel9 Red Hat Openshift Data Foundation 4 odf4/odf-console-rhel9, odf4/ocs-client-console-rhel9, rhceph-dev/odf4-odf-console-rhel9, odf4/odf-multicluster-console-rhel9, rhceph-dev/odf4-ocs-client-console-rhel9, rhceph-dev/odf4-odf-multicluster-console-rhel9 Red Hat OpenShift distributed tracing 3 rhosdt/tempo-jaeger-query-rhel9
    +5 more products
    Red Hat OpenShift GitOps openshift-gitops-1/argocd-rhel8, openshift-gitops-1/argocd-rhel9, openshift-gitops-1/console-plugin-rhel8, openshift-gitops-1/console-plugin-rhel9 Red Hat OpenShift Virtualization 4 container-native-virtualization/kubevirt-console-plugin, container-native-virtualization/kubevirt-console-plugin-rhel9 Red Hat Process Automation 7 react-router Red Hat Quay 3 quay/quay-rhel8, quay/quay-rhel9 Red Hat Satellite 6 satellite/iop-advisor-frontend-rhel9, satellite/iop-vulnerability-frontend-rhel9, satellite/iop-host-inventory-frontend-rhel9
    affected: workaround, no fix available
  • Red Hat Single Sign-On 7 react-router
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Trusted Artifact Signer rhtas/rhtas-console-ui-rhel9 Red Hat Trusted Profile Analyzer rhtpa/rhtpa-trustification-service-rhel9
    affected: workaround, no fix available
  • Red Hat Data Grid 8.6.2
    fixed: vendor fix RHSA-2026:41951
  • Red Hat Discovery 2 discovery/discovery-ui-rhel9 1792603924, discovery/discovery-ui-rhel9 1793218530
    fixed: vendor fix RHSA-2026:92136
  • Red Hat OpenShift AI 3.3 rhoai/odh-dashboard-rhel9 1783082634, rhoai/odh-dashboard-rhel9 1790128681, rhoai/odh-mod-arch-maas-rhel9 1783082680, rhoai/odh-mod-arch-maas-rhel9 1790128949, rhoai/odh-mod-arch-gen-ai-rhel9 1783082724, rhoai/odh-mod-arch-gen-ai-rhel9 1790128173, +2 more
    fixed: vendor fix RHSA-2026:73987
  • Red Hat OpenShift AI 3.4 rhoai/odh-dashboard-rhel9 1787347991, rhoai/odh-mod-arch-maas-rhel9 1782722695, rhoai/odh-mod-arch-automl-rhel9 1782722421, rhoai/odh-mod-arch-gen-ai-rhel9 1782134585, rhoai/odh-mod-arch-mlflow-rhel9 1782132932, rhoai/odh-mod-arch-autorag-rhel9 1782722485, +2 more
    fixed: vendor fix RHSA-2026:60520
  • Red Hat OpenShift Dev Spaces 3.29 devspaces/dashboard-rhel9 1784737150
    fixed: vendor fix RHSA-2026:48124
  • Red Hat Cryostat 4 react-router, grafana-infinity-datasource-npm, cryostat-openshift-console-plugin-npm
    not affected: component not present
  • Red Hat Gatekeeper 3 gatekeeper/gatekeeper-rhel9
    not affected: vulnerable code not in execute path

23 more not affected in the full advisory

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
5 mo ago

Exploit prediction

0.19% chance of exploitation in the next 30 days, higher than 8% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 8.0 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N
GitHub 3.1 8.0 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N
NVD 3.1 4.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected packages

ecosystem package affected fixed in
npm react-router
>=7.7.0, <7.13.2
7.13.2

Affected products

  • remix-run react-router

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.