CVE-2026-33244

MEDIUMPre-NVD 5.45.4—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.4 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.1%, top 96% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
5.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.1%CVSS: 5.4Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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 (`) or Data Mode (createBrowserRouter/`). This is patched in version 7.13.2.

CVSS v3
5.4
EG Score
5.4MEDIUMmedium confidence
EG Risk
24
EG Risk 24/100

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity54% × 45%
Exploitation0% × 40%
Automatability0% × 15%
EPSS PROB
0.1%
EPSS %ILE
3rd
KEV
Not listed

Published

June 2, 2026

Last Modified

July 21, 2026

Advisory Details (1)

Auto-updated Jun 15, 2026
Patch available. Sources: github.
githubMentions a patch (unverified)

Stored XSS via unescaped Location header in prerendered redirect HTML · Advisory · remix-run/react-router · GitHub

https://github.com/remix-run/react-router/security/advisories/GHSA-f22v-gfqf-p8f3

Vendor Advisories for CVE-2026-33244(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFix by version rangeDependents
react-router—
  • 7.5.1 up to 7.13.2: fixed in 7.13.2
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 7× in last 7d / 27× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 166 total refreshes for this CVE.

  1. 2026-10-10 20:00 UTCEPSS rescore
  2. 2026-10-09 20:07 UTCEPSS rescore
  3. 2026-10-08 17:12 UTCEPSS rescore
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  9. 2026-10-03 12:39 UTCOSV refresh
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  24. 2026-09-13 16:47 UTCEPSS rescore
  25. 2026-09-13 00:06 UTCOSV refresh
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  1. 2026-09-12 15:01 UTCEPSS rescore
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  3. 2026-09-10 09:34 UTCEPSS rescore
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  18. 2026-08-25 03:44 UTCEG score recompute
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  27. 2026-08-19 17:03 UTCEPSS rescore
  28. 2026-08-18 13:48 UTCEPSS rescore
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  30. 2026-08-16 14:58 UTCEG score recompute
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  44. 2026-08-08 16:37 UTCEPSS rescore
  45. 2026-08-07 17:47 UTCEG score recompute
  46. 2026-08-06 19:12 UTCEG score recompute
  47. 2026-08-06 13:46 UTCEPSS rescore
  48. 2026-08-05 20:36 UTCEG score recompute
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  50. 2026-08-04 19:52 UTCEG score recompute
  51. 2026-08-04 15:10 UTCEPSS rescore
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  60. 2026-07-30 16:28 UTCEPSS rescore
  61. 2026-07-30 01:30 UTCEPSS rescore
  62. 2026-07-29 10:46 UTCEG score recompute
  63. 2026-07-28 03:37 UTCEG score recompute
  64. 2026-07-27 14:13 UTCEPSS rescore
  65. 2026-07-26 22:53 UTCEG score recompute
  66. 2026-07-26 14:54 UTCEPSS rescore
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  70. 2026-07-23 14:18 UTCEPSS rescore
  71. 2026-07-23 14:18 UTCEPSS rescore
  72. 2026-07-23 03:09 UTCEG score recompute
  73. 2026-07-22 14:08 UTCEPSS rescore
  74. 2026-07-21 15:24 UTCEPSS rescore
  75. 2026-07-20 17:08 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2026-33244?
CVE-2026-33244 is a medium vulnerability published on June 2, 2026. 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…
When was CVE-2026-33244 disclosed?
CVE-2026-33244 was first published on June 2, 2026, with the most recent update on July 21, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-33244 actively exploited?
CVE-2026-33244 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (3rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-33244?
CVE-2026-33244 has a CVSS base score of 5.4 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-33244?
A fix for CVE-2026-33244 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-33244 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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