CVE-2026-87589

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreHIGH confidence

Score 6.5 from GitHub Security Advisory published 2026-09-09. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 4 sources updated this week
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.5Exploit: None knownExposed: 0

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

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

CVSS v3
6.5
Vendor severity
MEDIUMper Google (Chromium)Vendor's own band, not a CVSS rating — advisory text: (Chromium security severity: Medium)
EG Score
6.5(high)
EG Risk
29(Track)
EG Risk 29/100SSVC: 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
Severity65% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
17%
KEV
Not listed

Published

September 9, 2026

Last Modified

September 11, 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/518002426
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-2026-87589(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 30× in last 7d / 62× 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 12:33 UTCEG score recompute
  2. 2026-09-25 12:33 UTCVendor advisory
  3. 2026-09-25 12:33 UTCGHSA enrichment
  4. 2026-09-24 14:04 UTCEPSS rescore
  5. 2026-09-24 12:42 UTCEG score recompute
  6. 2026-09-24 12:42 UTCVendor advisory
  7. 2026-09-24 12:42 UTCGHSA enrichment
  8. 2026-09-23 17:54 UTCEPSS rescore
  9. 2026-09-23 12:51 UTCEG score recompute
  10. 2026-09-23 12:51 UTCVendor advisory
  11. 2026-09-23 12:51 UTCGHSA enrichment
  12. 2026-09-22 16:01 UTCEPSS rescore
  13. 2026-09-22 13:00 UTCEG score recompute
  14. 2026-09-22 13:00 UTCVendor advisory
  15. 2026-09-22 13:00 UTCGHSA enrichment
  16. 2026-09-21 21:09 UTCEPSS rescore
  17. 2026-09-21 13:09 UTCEG score recompute
  18. 2026-09-21 13:09 UTCVendor advisory
  19. 2026-09-21 13:09 UTCGHSA enrichment
  20. 2026-09-20 20:16 UTCEPSS rescore
  21. 2026-09-20 13:18 UTCEG score recompute
  22. 2026-09-20 13:18 UTCVendor advisory
  23. 2026-09-20 13:18 UTCGHSA enrichment
  24. 2026-09-19 13:26 UTCEG score recompute
  25. 2026-09-19 13:26 UTCVendor advisory
Show 37 more
  1. 2026-09-19 13:26 UTCGHSA enrichment
  2. 2026-09-18 19:28 UTCEPSS rescore
  3. 2026-09-18 13:35 UTCEG score recompute
  4. 2026-09-18 13:35 UTCVendor advisory
  5. 2026-09-18 13:35 UTCGHSA enrichment
  6. 2026-09-17 19:32 UTCEPSS rescore
  7. 2026-09-17 13:44 UTCEG score recompute
  8. 2026-09-17 13:44 UTCVendor advisory
  9. 2026-09-17 13:44 UTCGHSA enrichment
  10. 2026-09-16 14:09 UTCEPSS rescore
  11. 2026-09-16 13:53 UTCEG score recompute
  12. 2026-09-16 13:53 UTCVendor advisory
  13. 2026-09-16 13:53 UTCGHSA enrichment
  14. 2026-09-16 05:15 UTCEPSS rescore
  15. 2026-09-15 13:56 UTCEG score recompute
  16. 2026-09-15 13:56 UTCVendor advisory
  17. 2026-09-15 13:56 UTCGHSA enrichment
  18. 2026-09-15 03:12 UTCEPSS rescore
  19. 2026-09-14 14:05 UTCEG score recompute
  20. 2026-09-14 14:05 UTCGHSA enrichment
  21. 2026-09-13 14:14 UTCEG score recompute
  22. 2026-09-13 14:14 UTCGHSA enrichment
  23. 2026-09-12 14:23 UTCEG score recompute
  24. 2026-09-12 14:23 UTCGHSA enrichment
  25. 2026-09-11 14:53 UTCEPSS rescore
  26. 2026-09-11 14:53 UTCEPSS rescore
  27. 2026-09-11 14:32 UTCGHSA enrichment
  28. 2026-09-11 14:12 UTCEG score recompute
  29. 2026-09-11 14:12 UTCGHSA enrichment
  30. 2026-09-10 14:21 UTCGHSA enrichment
  31. 2026-09-10 14:06 UTCEG score recompute
  32. 2026-09-10 14:06 UTCGHSA enrichment
  33. 2026-09-10 14:04 UTCMITRE cvelistV5CVSS v3 → 6.5 · severity → MEDIUM
  34. 2026-09-09 15:55 UTCGHSA enrichment
  35. 2026-09-09 01:22 UTCNVD update
  36. 2026-09-09 01:00 UTCEG score recompute
  37. 2026-09-09 00:57 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-87589?
CVE-2026-87589 is a medium vulnerability published on September 9, 2026. Incorrect authorization in SiteIsolation in Google Chrome prior to 153.0.8010.36 allowed a remote attacker who had compromised the renderer process to bypass system access restrictions via a crafted HTML page. (Chromium security severity: Medium)
When was CVE-2026-87589 disclosed?
CVE-2026-87589 was first published in the National Vulnerability Database on September 9, 2026, with the most recent update on September 11, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-87589 actively exploited?
CVE-2026-87589 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 83.3% of all scored CVEs.
What is the CVSS score of CVE-2026-87589?
CVE-2026-87589 has a CVSS v3.1 base score of 6.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-87589?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-87589, 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

Explore the affected products and dependency analysis for CVE-2026-87589

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