CVE-2026-87471

HIGHPre-NVD 8.18.1—
EchelonGraph scoreHIGH confidence

Score 8.1 from GitHub Security Advisory (severity: HIGH) published 2026-09-09. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 8.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 4 sources updated this week
8.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.1Exploit: None knownExposed: 0

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

Incorrect authorization in ServiceWorker in Google Chrome prior to 153.0.8010.36 allowed a remote attacker who had compromised the renderer process to bypass site isolation via a crafted HTML page. (Chromium security severity: Medium)

CVSS v3
8.1
Vendor severity
MEDIUMper Google (Chromium)Vendor's own band, not a CVSS rating — advisory text: (Chromium security severity: Medium)
EG Score
8.1(high)
EG Risk
37(Track)
EG Risk 37/100SSVC: 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
Severity81% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
22%
KEV
Not listed

Published

September 9, 2026

Last Modified

September 10, 2026

Advisory Details (2)

Auto-updated Sep 10, 2026
⚠️ Active exploitation confirmed. No patch confirmed yet.
generic

Chromium

https://issues.chromium.org/issues/498869663
generic🔴 Active Exploitation

Chrome Releases: Stable Channel Update for Desktop

https://chromereleases.googleblog.com/2026/09/stable-channel-update-for-desktop_0808145027.html

Vendor Advisories for CVE-2026-87471(1)

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

Weakness Classification(1)

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

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 41× in last 7d / 90× 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. 2026-09-25 06:00 UTCVendor advisory
  2. 2026-09-25 06:00 UTCGHSA enrichment
  3. 2026-09-24 18:33 UTCEG score recompute
  4. 2026-09-24 18:33 UTCVendor advisory
  5. 2026-09-24 18:33 UTCGHSA enrichment
  6. 2026-09-24 14:04 UTCEPSS rescore
  7. 2026-09-24 07:06 UTCVendor advisory
  8. 2026-09-24 07:05 UTCGHSA enrichment
  9. 2026-09-23 19:38 UTCEG score recompute
  10. 2026-09-23 19:38 UTCVendor advisory
  11. 2026-09-23 19:38 UTCGHSA enrichment
  12. 2026-09-23 17:54 UTCEPSS rescore
  13. 2026-09-23 07:24 UTCVendor advisory
  14. 2026-09-23 07:24 UTCGHSA enrichment
  15. 2026-09-22 19:57 UTCEG score recompute
  16. 2026-09-22 19:57 UTCVendor advisory
  17. 2026-09-22 19:57 UTCGHSA enrichment
  18. 2026-09-22 16:01 UTCEPSS rescore
  19. 2026-09-22 08:30 UTCEG score recompute
  20. 2026-09-22 08:30 UTCVendor advisory
  21. 2026-09-22 08:30 UTCGHSA enrichment
  22. 2026-09-21 21:09 UTCEPSS rescore
  23. 2026-09-21 21:02 UTCVendor advisory
  24. 2026-09-21 21:02 UTCGHSA enrichment
  25. 2026-09-21 09:35 UTCVendor advisory
Show 65 more
  1. 2026-09-21 09:35 UTCGHSA enrichment
  2. 2026-09-20 22:08 UTCEG score recompute
  3. 2026-09-20 22:08 UTCVendor advisory
  4. 2026-09-20 22:08 UTCGHSA enrichment
  5. 2026-09-20 20:16 UTCEPSS rescore
  6. 2026-09-20 10:40 UTCVendor advisory
  7. 2026-09-20 10:40 UTCGHSA enrichment
  8. 2026-09-19 23:08 UTCEG score recompute
  9. 2026-09-19 23:08 UTCVendor advisory
  10. 2026-09-19 23:08 UTCGHSA enrichment
  11. 2026-09-19 11:40 UTCVendor advisory
  12. 2026-09-19 11:40 UTCGHSA enrichment
  13. 2026-09-19 00:13 UTCEG score recompute
  14. 2026-09-19 00:13 UTCVendor advisory
  15. 2026-09-19 00:13 UTCGHSA enrichment
  16. 2026-09-18 19:28 UTCEPSS rescore
  17. 2026-09-18 12:46 UTCVendor advisory
  18. 2026-09-18 12:46 UTCGHSA enrichment
  19. 2026-09-18 01:19 UTCEG score recompute
  20. 2026-09-18 01:19 UTCVendor advisory
  21. 2026-09-18 01:19 UTCGHSA enrichment
  22. 2026-09-17 19:32 UTCEPSS rescore
  23. 2026-09-17 13:52 UTCVendor advisory
  24. 2026-09-17 13:52 UTCGHSA enrichment
  25. 2026-09-17 02:24 UTCVendor advisory
  26. 2026-09-17 02:23 UTCGHSA enrichment
  27. 2026-09-16 14:52 UTCEG score recompute
  28. 2026-09-16 14:52 UTCVendor advisory
  29. 2026-09-16 14:52 UTCGHSA enrichment
  30. 2026-09-16 14:09 UTCEPSS rescore
  31. 2026-09-16 05:15 UTCEPSS rescore
  32. 2026-09-16 03:23 UTCVendor advisory
  33. 2026-09-16 03:23 UTCGHSA enrichment
  34. 2026-09-15 15:52 UTCVendor advisory
  35. 2026-09-15 15:51 UTCGHSA enrichment
  36. 2026-09-15 04:24 UTCEG score recompute
  37. 2026-09-15 04:24 UTCVendor advisory
  38. 2026-09-15 04:24 UTCGHSA enrichment
  39. 2026-09-15 03:12 UTCEPSS rescore
  40. 2026-09-15 03:12 UTCEPSS rescore
  41. 2026-09-14 16:56 UTCGHSA enrichment
  42. 2026-09-14 05:28 UTCGHSA enrichment
  43. 2026-09-13 18:01 UTCEG score recompute
  44. 2026-09-13 18:01 UTCGHSA enrichment
  45. 2026-09-13 06:33 UTCGHSA enrichment
  46. 2026-09-12 19:06 UTCEG score recompute
  47. 2026-09-12 19:06 UTCGHSA enrichment
  48. 2026-09-12 07:38 UTCGHSA enrichment
  49. 2026-09-11 20:09 UTCEG score recompute
  50. 2026-09-11 20:09 UTCGHSA enrichment
  51. 2026-09-11 14:53 UTCEPSS rescore
  52. 2026-09-11 14:53 UTCEPSS rescore
  53. 2026-09-11 08:26 UTCEG score recompute
  54. 2026-09-11 08:26 UTCGHSA enrichment
  55. 2026-09-10 20:59 UTCGHSA enrichment
  56. 2026-09-10 19:19 UTCGHSA enrichment
  57. 2026-09-10 18:52 UTCEG score recompute▲ 1.60
  58. 2026-09-10 18:51 UTCGHSA enrichment
  59. 2026-09-10 18:49 UTCMITRE cvelistV5CVSS v3 → 8.1 · severity → HIGH
  60. 2026-09-10 15:50 UTCEG score recompute
  61. 2026-09-10 15:50 UTCGHSA enrichment
  62. 2026-09-09 15:58 UTCGHSA enrichment
  63. 2026-09-09 01:22 UTCNVD update
  64. 2026-09-09 01:01 UTCEG score recompute
  65. 2026-09-09 00:57 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-87471?
CVE-2026-87471 is a high vulnerability published on September 9, 2026. Incorrect authorization in ServiceWorker in Google Chrome prior to 153.0.8010.36 allowed a remote attacker who had compromised the renderer process to bypass site isolation via a crafted HTML page. (Chromium security severity: Medium)
When was CVE-2026-87471 disclosed?
CVE-2026-87471 was first published in the National Vulnerability Database on September 9, 2026, with the most recent update on September 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-87471 actively exploited?
CVE-2026-87471 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 78.1% of all scored CVEs.
What is the CVSS score of CVE-2026-87471?
CVE-2026-87471 has a CVSS v3.1 base score of 8.1 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-87471?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-87471, 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

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