CVE-2026-53667

MEDIUMNVD 6.16.1—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.1 under NVD CVSS v3. EPSS exploit probability: 0.4% (26th percentile of EPSS-scored CVEs). 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, nvd
6.1EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 6.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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.

CVSS v3
6.1
EG Score
6.1MEDIUMmedium confidence
EG Risk
28
EG Risk 28/100CISA SSVC

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
Severity61% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.4%
EPSS %ILE
27th
KEV
Not listed

CISA SSVCTrack at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

July 23, 2026

Last Modified

August 3, 2026

Advisory Details (5)

Auto-updated Jul 27, 2026
Patch available. Sources: github, github_pr, github_commit, github_release.
github_release Patch Available

v7.18.0

Patch available: remix-run/react-router [email protected]

https://github.com/remix-run/react-router/releases/tag/[email protected]
generic

react-router/CHANGELOG.md at main · remix-run/react-router · GitHub

https://github.com/remix-run/react-router/blob/main/CHANGELOG.md#v7180
github_commit Patch Available

commit ce596e823f0d (remix-run/react-router)

Patch available: remix-run/react-router [email protected] (contains commit ce596e823f0d)

https://github.com/remix-run/react-router/commit/ce596e823f0d7b883a433af1d5a839a8b9fe0242
github_pr Patch Available

Validate RSC redirect protocols

Patch available: remix-run/react-router [email protected] (PR #15177 merged 2026-06-11)

https://github.com/remix-run/react-router/pull/15177
githubMentions a patch (unverified)

RSCErrorHandler Missing Protocol Validation (XSS) · Advisory · remix-run/react-router · GitHub

https://github.com/remix-run/react-router/security/advisories/GHSA-h8fp-f39c-q6mh

Vendor Advisories for CVE-2026-53667(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—
  • 7.11.0 up to 7.18.0: fixed in 7.18.0
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 37× 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 115 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
  4. 2026-10-07 23:48 UTCEPSS rescore
  5. 2026-10-06 15:18 UTCEPSS rescore
  6. 2026-10-05 17:43 UTCEPSS rescore
  7. 2026-10-04 23:22 UTCEPSS rescore
  8. 2026-10-04 08:19 UTCEG score recompute
  9. 2026-10-03 14:26 UTCEPSS rescore
  10. 2026-10-03 03:24 UTCEG score recompute
  11. 2026-10-02 17:56 UTCEPSS rescore
  12. 2026-10-01 19:50 UTCEPSS rescore
  13. 2026-10-01 06:15 UTCEG score recompute
  14. 2026-09-30 15:03 UTCEPSS rescore
  15. 2026-09-29 15:22 UTCEPSS rescore
  16. 2026-09-28 13:51 UTCEPSS rescore
  17. 2026-09-28 05:04 UTCEG score recompute
  18. 2026-09-27 13:48 UTCEPSS rescore
  19. 2026-09-26 15:59 UTCEPSS rescore
  20. 2026-09-24 14:04 UTCEPSS rescore
  21. 2026-09-23 22:21 UTCEG score recompute
  22. 2026-09-23 17:54 UTCEPSS rescore
  23. 2026-09-22 22:42 UTCEG score recompute
  24. 2026-09-20 20:16 UTCEPSS rescore
  25. 2026-09-20 01:46 UTCEG score recompute
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  1. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-18 07:48 UTCEG score recompute
  3. 2026-09-17 09:54 UTCEG score recompute
  4. 2026-09-16 14:08 UTCEPSS rescore
  5. 2026-09-16 12:00 UTCEG score recompute
  6. 2026-09-16 05:15 UTCEPSS rescore
  7. 2026-09-15 09:51 UTCEG score recompute
  8. 2026-09-14 10:26 UTCEG score recompute
  9. 2026-09-13 16:47 UTCEPSS rescore
  10. 2026-09-13 12:31 UTCEG score recompute
  11. 2026-09-11 16:42 UTCEG score recompute
  12. 2026-09-11 14:53 UTCEPSS rescore
  13. 2026-09-10 15:06 UTCEG score recompute
  14. 2026-09-10 09:35 UTCEPSS rescore
  15. 2026-09-09 08:53 UTCEG score recompute
  16. 2026-09-08 22:01 UTCEPSS rescore
  17. 2026-09-07 21:28 UTCEG score recompute
  18. 2026-09-07 16:01 UTCEPSS rescore
  19. 2026-09-06 17:25 UTCEG score recompute
  20. 2026-09-06 13:47 UTCEPSS rescore
  21. 2026-09-05 19:27 UTCEG score recompute
  22. 2026-09-04 13:14 UTCEG score recompute
  23. 2026-09-04 05:06 UTCEPSS rescore
  24. 2026-09-02 14:12 UTCEPSS rescore
  25. 2026-09-01 23:20 UTCEG score recompute
  26. 2026-09-01 13:54 UTCEPSS rescore
  27. 2026-09-01 04:40 UTCEPSS rescore
  28. 2026-08-30 22:23 UTCEG score recompute
  29. 2026-08-30 19:17 UTCEPSS rescore
  30. 2026-08-30 01:22 UTCEPSS rescore
  31. 2026-08-30 00:29 UTCEG score recompute
  32. 2026-08-28 21:41 UTCEPSS rescore
  33. 2026-08-27 14:25 UTCEPSS rescore
  34. 2026-08-27 10:09 UTCEG score recompute
  35. 2026-08-26 14:46 UTCEPSS rescore
  36. 2026-08-24 15:03 UTCEG score recompute
  37. 2026-08-23 17:08 UTCEG score recompute
  38. 2026-08-23 00:19 UTCEPSS rescore
  39. 2026-08-22 19:14 UTCEG score recompute
  40. 2026-08-21 23:49 UTCEPSS rescore
  41. 2026-08-20 23:25 UTCEG score recompute
  42. 2026-08-20 22:55 UTCEPSS rescore
  43. 2026-08-20 01:31 UTCEG score recompute
  44. 2026-08-19 17:04 UTCEPSS rescore
  45. 2026-08-19 03:36 UTCEG score recompute
  46. 2026-08-18 13:48 UTCEPSS rescore
  47. 2026-08-18 05:34 UTCEG score recompute
  48. 2026-08-17 13:47 UTCEPSS rescore
  49. 2026-08-17 07:21 UTCEG score recompute
  50. 2026-08-16 14:56 UTCEPSS rescore
  51. 2026-08-16 09:27 UTCEG score recompute
  52. 2026-08-16 02:14 UTCEPSS rescore
  53. 2026-08-15 11:33 UTCEG score recompute
  54. 2026-08-15 01:30 UTCEPSS rescore
  55. 2026-08-14 13:38 UTCEG score recompute
  56. 2026-08-13 22:00 UTCEPSS rescore
  57. 2026-08-12 17:50 UTCEG score recompute
  58. 2026-08-12 13:51 UTCEPSS rescore
  59. 2026-08-11 19:56 UTCEG score recompute
  60. 2026-08-11 00:00 UTCEPSS rescore
  61. 2026-08-10 00:08 UTCEG score recompute
  62. 2026-08-09 13:46 UTCEPSS rescore
  63. 2026-08-09 02:14 UTCEG score recompute
  64. 2026-08-08 16:37 UTCEPSS rescore
  65. 2026-08-08 04:19 UTCEG score recompute
  66. 2026-08-07 06:25 UTCEG score recompute
  67. 2026-08-06 13:47 UTCEPSS rescore
  68. 2026-08-06 08:30 UTCEG score recompute
  69. 2026-08-05 19:17 UTCEPSS rescore
  70. 2026-08-05 10:36 UTCEG score recompute
  71. 2026-08-04 15:10 UTCEPSS rescore
  72. 2026-08-04 12:39 UTCEG score recompute
  73. 2026-08-04 10:39 UTCEPSS rescore
  74. 2026-08-03 14:13 UTCEG score recompute▼ 0.80
  75. 2026-08-03 14:12 UTCNVD updateCVSS v3 → 6.1

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-53667?
CVE-2026-53667 is a medium vulnerability published on July 23, 2026. 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.…
When was CVE-2026-53667 disclosed?
CVE-2026-53667 was first published on July 23, 2026, with the most recent update on August 3, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-53667 actively exploited?
CVE-2026-53667 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (27th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-53667?
CVE-2026-53667 has a CVSS v3 base score of 6.1 (NVD).
How do I remediate CVE-2026-53667?
A fix for CVE-2026-53667 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-53667 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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