CVE-2026-87433

HIGHNVD 8.88.8—
EchelonGraph scoreHIGH confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-09-09. NVD baseline CVSS 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 4 sources updated this week
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.8Exploit: None knownExposed: 0

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

Race condition in FileAPI 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
8.8
Vendor severity
MEDIUMper Google (Chromium)Vendor's own band, not a CVSS rating — advisory text: (Chromium security severity: Medium)
EG Score
8.8(high)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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
Severity88% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
23%
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🟡 PoC Available

Chromium

https://issues.chromium.org/issues/497574154
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-2026-87433(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 36× 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. 2026-09-19 16:08 UTCEG score recompute
  2. 2026-09-19 16:08 UTCVendor advisory
  3. 2026-09-19 16:08 UTCGHSA enrichment
  4. 2026-09-19 04:10 UTCEG score recompute
  5. 2026-09-19 04:10 UTCVendor advisory
  6. 2026-09-19 04:10 UTCGHSA enrichment
  7. 2026-09-18 19:28 UTCEPSS rescore
  8. 2026-09-18 16:13 UTCVendor advisory
  9. 2026-09-18 16:13 UTCGHSA enrichment
  10. 2026-09-18 03:54 UTCEG score recompute
  11. 2026-09-18 03:54 UTCVendor advisory
  12. 2026-09-18 03:54 UTCGHSA enrichment
  13. 2026-09-17 19:32 UTCEPSS rescore
  14. 2026-09-17 15:56 UTCVendor advisory
  15. 2026-09-17 15:56 UTCGHSA enrichment
  16. 2026-09-17 03:59 UTCVendor advisory
  17. 2026-09-17 03:59 UTCGHSA enrichment
  18. 2026-09-16 16:01 UTCEG score recompute
  19. 2026-09-16 16:01 UTCVendor advisory
  20. 2026-09-16 16:01 UTCGHSA enrichment
  21. 2026-09-16 14:09 UTCEPSS rescore
  22. 2026-09-16 05:15 UTCEPSS rescore
  23. 2026-09-16 04:03 UTCVendor advisory
  24. 2026-09-16 04:03 UTCGHSA enrichment
  25. 2026-09-15 16:03 UTCVendor advisory
Show 29 more
  1. 2026-09-15 16:03 UTCGHSA enrichment
  2. 2026-09-15 04:05 UTCEG score recompute
  3. 2026-09-15 04:05 UTCVendor advisory
  4. 2026-09-15 04:05 UTCGHSA enrichment
  5. 2026-09-15 03:12 UTCEPSS rescore
  6. 2026-09-15 03:12 UTCEPSS rescore
  7. 2026-09-14 16:06 UTCGHSA enrichment
  8. 2026-09-14 04:08 UTCEG score recompute
  9. 2026-09-14 04:08 UTCGHSA enrichment
  10. 2026-09-13 16:11 UTCGHSA enrichment
  11. 2026-09-13 04:13 UTCGHSA enrichment
  12. 2026-09-12 16:15 UTCEG score recompute
  13. 2026-09-12 16:15 UTCGHSA enrichment
  14. 2026-09-12 04:18 UTCGHSA enrichment
  15. 2026-09-11 16:20 UTCEG score recompute
  16. 2026-09-11 16:20 UTCGHSA enrichment
  17. 2026-09-11 14:53 UTCEPSS rescore
  18. 2026-09-11 14:53 UTCEPSS rescore
  19. 2026-09-11 04:22 UTCGHSA enrichment
  20. 2026-09-10 16:23 UTCGHSA enrichment
  21. 2026-09-10 15:40 UTCEG score recompute▲ 2.30
  22. 2026-09-10 15:40 UTCGHSA enrichment
  23. 2026-09-10 13:56 UTCNVD updateCVSS v3 → 8.8 · severity → HIGH
  24. 2026-09-10 13:43 UTCEG score recompute
  25. 2026-09-10 13:43 UTCGHSA enrichment
  26. 2026-09-09 15:58 UTCGHSA enrichment
  27. 2026-09-09 01:22 UTCNVD update
  28. 2026-09-09 01:02 UTCEG score recompute
  29. 2026-09-09 00:57 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-87433?
CVE-2026-87433 is a high vulnerability published on September 9, 2026. Race condition in FileAPI 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-2026-87433 disclosed?
CVE-2026-87433 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-2026-87433 actively exploited?
CVE-2026-87433 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 77.4% of all scored CVEs.
What is the CVSS score of CVE-2026-87433?
CVE-2026-87433 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-87433?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-87433, 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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