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CVE Record

CVE-2026-22029: React Router vulnerable to XSS via Open Redirects

React Router is a router for React. In @remix-run/router version prior to 1.23.2 and react-router 7.0.0 through 7.11.0, React Router (and Remix v1/v2) SPA open navigation redirects originating from loaders or actions in Framework Mode, Data Mode, or the unstable RSC modes can result in unsafe URLs causing unintended javascript execution on the client. This is only an issue if you are creating redirect paths from untrusted content or via an open redirect. There is no impact if Declarative Mode (<BrowserRouter>) is being used. This issue has been patched in @remix-run/router version 1.23.2 and react-router version 7.12.0.

HighCVSS 8Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

Affected React applications can execute attacker-controlled JavaScript when unsafe redirect destinations reach certain client-side navigation flows. Exploitation requires user interaction and an application that builds redirects from untrusted input or permits open redirects. Applications using only Declarative Mode with BrowserRouter are not affected.

Executive priority

Prioritize remediation for public applications that combine affected versions with user-influenced redirects. Patch promptly because successful exploitation can compromise user data and application actions. BrowserRouter-only deployments can be deprioritized after their routing mode is verified.

Technical view

CVE-2026-22029 is a CWE-79 client-side XSS issue in SPA navigation redirects returned by loaders or actions in Framework Mode, Data Mode, or unstable RSC modes. It affects react-router 7.0.0 through 7.11.0, @remix-run/router before 1.23.2, and relevant Remix v1/v2 usage described by the advisory.

Likely exposure

Exposure is most likely in internet-facing applications using affected versions and non-Declarative routing modes where loader or action redirects incorporate untrusted content. Risk is substantially reduced when redirect destinations are strictly controlled. BrowserRouter-only Declarative Mode applications are explicitly unaffected.

Exploitation context

The CVSS score is 8.0, with network reachability, high attack complexity, no required privileges, and required user interaction. The supplied sources do not establish active exploitation, and the CVE is not listed as KEV in the source bundle.

Researcher notes

The vulnerability is conditional rather than universal: affected routing mode, an unsafe redirect source, and user interaction are required. CVSS indicates changed scope with high confidentiality and integrity impact but no availability impact. The bundle does not provide exploit telemetry or evidence of active exploitation.

Mitigation direction

  • Upgrade react-router to version 7.12.0 or later.
  • Upgrade @remix-run/router to version 1.23.2 or later.
  • Review vendor guidance for affected Remix v1/v2 applications.
  • Restrict redirects to explicitly allowlisted local destinations.
  • Stop constructing redirect paths from untrusted content.

Validation and detection

  • Inventory deployed react-router, @remix-run/router, and Remix versions.
  • Identify applications using Framework Mode, Data Mode, or unstable RSC modes.
  • Review loader and action redirects for untrusted destination input.
  • Confirm production dependency resolution contains the patched versions.
  • Verify redirect handling rejects non-allowlisted destinations.
Prepared
Confidence
high
Sources
3

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · medium confidence lookup

CWE-79: User-session and phishing behavior lookup

Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2026-22029 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
High
CVSS
8 (3.1)
Known Exploited
No
Published

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

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

2CVSS vectors
5Timeline events
2ADP providers
42Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: total

CVSS vector scores

2 official scores

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
8CVSS 3.1HighCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N1.65.8GitHub_M
8CVSS 3.1HighCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N1.65.8redhat-SADP

Vulnerability scoring details

Base CVSS 3.1 score

8High
CVSS 3.1 vector shape for CVE-2026-22029Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. ADP timelineredhat-SADP

    Made public.

  3. CVE publishedCVE Program

    The CVE record was published.

  4. ADP timelineredhat-SADP

    Reported to Red Hat.

  5. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc
redhat-SADP@remix-run/router: react-router: React Router vulnerable to XSS via Open Redirects
other:Red Hat severity ratingcvssV3_1
  • 2026-01-10T04:01:03.694Z: Reported to Red Hat.
  • 2026-01-10T02:42:32.736Z: Made public.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
remix-runreact-router>= 7.0.0, < 7.12.0Listed
remix-run@remix-run/router< 1.23.2Listed
Weakness

CWE details

CWE-79

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-79 · source CWE mapping

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Open CWE intelligenceSame-CWE CVEs