CVE-2026-53667

MEDIUMNVD 6.16.1—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.1 under NVD CVSS v3. EPSS exploit probability: 0.2%, top 90% 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, nvd
6.1EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.1Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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
6.1(medium)
EG Risk
28(Track)
EG Risk 28/100SSVC: Track

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%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
10%
KEV
Not listed

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
github Patch Available

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 rangeFixed inDependents
react-router—7.18.0—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 54× 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.

  1. 2026-08-26 14:46 UTCEPSS rescore
  2. 2026-08-24 15:03 UTCEG score recompute
  3. 2026-08-23 17:08 UTCEG score recompute
  4. 2026-08-23 00:19 UTCEPSS rescore
  5. 2026-08-22 19:14 UTCEG score recompute
  6. 2026-08-21 23:49 UTCEPSS rescore
  7. 2026-08-20 23:25 UTCEG score recompute
  8. 2026-08-20 22:55 UTCEPSS rescore
  9. 2026-08-20 01:31 UTCEG score recompute
  10. 2026-08-19 17:04 UTCEPSS rescore
  11. 2026-08-19 03:36 UTCEG score recompute
  12. 2026-08-18 13:48 UTCEPSS rescore
  13. 2026-08-18 05:34 UTCEG score recompute
  14. 2026-08-17 13:47 UTCEPSS rescore
  15. 2026-08-17 07:21 UTCEG score recompute
  16. 2026-08-16 14:56 UTCEPSS rescore
  17. 2026-08-16 09:27 UTCEG score recompute
  18. 2026-08-16 02:14 UTCEPSS rescore
  19. 2026-08-15 11:33 UTCEG score recompute
  20. 2026-08-15 01:30 UTCEPSS rescore
  21. 2026-08-14 13:38 UTCEG score recompute
  22. 2026-08-13 22:00 UTCEPSS rescore
  23. 2026-08-12 17:50 UTCEG score recompute
  24. 2026-08-12 13:51 UTCEPSS rescore
  25. 2026-08-11 19:56 UTCEG score recompute
Show 31 more
  1. 2026-08-11 00:00 UTCEPSS rescore
  2. 2026-08-10 00:08 UTCEG score recompute
  3. 2026-08-09 13:46 UTCEPSS rescore
  4. 2026-08-09 02:14 UTCEG score recompute
  5. 2026-08-08 16:37 UTCEPSS rescore
  6. 2026-08-08 04:19 UTCEG score recompute
  7. 2026-08-07 06:25 UTCEG score recompute
  8. 2026-08-06 13:47 UTCEPSS rescore
  9. 2026-08-06 08:30 UTCEG score recompute
  10. 2026-08-05 19:17 UTCEPSS rescore
  11. 2026-08-05 10:36 UTCEG score recompute
  12. 2026-08-04 15:10 UTCEPSS rescore
  13. 2026-08-04 12:39 UTCEG score recompute
  14. 2026-08-04 10:39 UTCEPSS rescore
  15. 2026-08-03 14:13 UTCEG score recompute▼ 0.80
  16. 2026-08-03 14:12 UTCNVD updateCVSS v3 → 6.1
  17. 2026-08-03 10:36 UTCEPSS rescore
  18. 2026-08-02 06:12 UTCEG score recompute
  19. 2026-08-02 02:27 UTCEPSS rescore
  20. 2026-08-01 08:09 UTCEG score recompute
  21. 2026-08-01 04:16 UTCEPSS rescore
  22. 2026-07-31 10:15 UTCEG score recompute
  23. 2026-07-30 16:28 UTCEPSS rescore
  24. 2026-07-30 12:19 UTCEG score recompute
  25. 2026-07-30 01:30 UTCEPSS rescore
  26. 2026-07-28 15:46 UTCEG score recompute
  27. 2026-07-28 15:37 UTCEPSS rescore
  28. 2026-07-28 14:42 UTCEG score recompute
  29. 2026-07-27 22:25 UTCEG score recompute
  30. 2026-07-27 07:39 UTCEG score recompute
  31. 2026-07-23 20:12 UTCEG score recompute

Related CVEs(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 in the National Vulnerability Database 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% probability of exploitation in the next 30 days, which ranks it in the top 89.8% of all 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?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-53667, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-53667

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