CVE-2026-87509

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 Updater in Google Chrome on on Windows prior to 153.0.8010.36 allowed a local attacker to execute arbitrary code outside the sandbox via a local program. (Chromium security severity: Low)

CVSS v3
8.1
Vendor severity
LOWper Google (Chromium)Vendor's own band, not a CVSS rating — advisory text: (Chromium security severity: Low)
EG Score
8.1(high)
EG Risk
36(Track)
EG Risk 36/100SSVC: 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
2%
KEV
Not listed

Published

September 9, 2026

Last Modified

September 10, 2026

Advisory Details (2)

Auto-updated Sep 9, 2026
⚠️ Active exploitation confirmed. No patch confirmed yet.
generic

Chromium

https://issues.chromium.org/issues/535718578
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-2026-87509(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 37× in last 7d / 84× 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 04:05 UTCVendor advisory
  2. 2026-09-25 04:05 UTCGHSA enrichment
  3. 2026-09-24 15:15 UTCEG score recompute
  4. 2026-09-24 15:15 UTCVendor advisory
  5. 2026-09-24 15:15 UTCGHSA enrichment
  6. 2026-09-24 14:04 UTCEPSS rescore
  7. 2026-09-24 02:22 UTCEG score recompute
  8. 2026-09-24 02:22 UTCVendor advisory
  9. 2026-09-24 02:22 UTCGHSA enrichment
  10. 2026-09-23 17:54 UTCEPSS rescore
  11. 2026-09-23 13:32 UTCVendor advisory
  12. 2026-09-23 13:32 UTCGHSA enrichment
  13. 2026-09-23 00:42 UTCEG score recompute
  14. 2026-09-23 00:42 UTCVendor advisory
  15. 2026-09-23 00:42 UTCGHSA enrichment
  16. 2026-09-22 16:01 UTCEPSS rescore
  17. 2026-09-22 11:52 UTCVendor advisory
  18. 2026-09-22 11:52 UTCGHSA enrichment
  19. 2026-09-21 23:02 UTCEG score recompute
  20. 2026-09-21 23:02 UTCVendor advisory
  21. 2026-09-21 23:02 UTCGHSA enrichment
  22. 2026-09-21 21:09 UTCEPSS rescore
  23. 2026-09-21 10:12 UTCVendor advisory
  24. 2026-09-21 10:12 UTCGHSA enrichment
  25. 2026-09-20 21:22 UTCVendor advisory
Show 59 more
  1. 2026-09-20 21:22 UTCGHSA enrichment
  2. 2026-09-20 08:30 UTCVendor advisory
  3. 2026-09-20 08:30 UTCGHSA enrichment
  4. 2026-09-19 19:40 UTCEG score recompute
  5. 2026-09-19 19:40 UTCVendor advisory
  6. 2026-09-19 19:40 UTCGHSA enrichment
  7. 2026-09-19 06:50 UTCEG score recompute
  8. 2026-09-19 06:50 UTCVendor advisory
  9. 2026-09-19 06:50 UTCGHSA enrichment
  10. 2026-09-18 19:28 UTCEPSS rescore
  11. 2026-09-18 17:59 UTCVendor advisory
  12. 2026-09-18 17:59 UTCGHSA enrichment
  13. 2026-09-18 05:09 UTCEG score recompute
  14. 2026-09-18 05:09 UTCVendor advisory
  15. 2026-09-18 05:09 UTCGHSA enrichment
  16. 2026-09-17 19:32 UTCEPSS rescore
  17. 2026-09-17 16:19 UTCVendor advisory
  18. 2026-09-17 16:19 UTCGHSA enrichment
  19. 2026-09-17 03:29 UTCVendor advisory
  20. 2026-09-17 03:29 UTCGHSA enrichment
  21. 2026-09-16 14:39 UTCEG score recompute
  22. 2026-09-16 14:39 UTCVendor advisory
  23. 2026-09-16 14:39 UTCGHSA enrichment
  24. 2026-09-16 14:09 UTCEPSS rescore
  25. 2026-09-16 01:47 UTCVendor advisory
  26. 2026-09-16 01:47 UTCGHSA enrichment
  27. 2026-09-15 12:57 UTCEG score recompute
  28. 2026-09-15 12:57 UTCVendor advisory
  29. 2026-09-15 12:57 UTCGHSA enrichment
  30. 2026-09-15 03:12 UTCEPSS rescore
  31. 2026-09-15 03:12 UTCEPSS rescore
  32. 2026-09-15 00:07 UTCVendor advisory
  33. 2026-09-15 00:07 UTCGHSA enrichment
  34. 2026-09-14 11:17 UTCGHSA enrichment
  35. 2026-09-13 22:27 UTCEG score recompute
  36. 2026-09-13 22:27 UTCGHSA enrichment
  37. 2026-09-13 09:37 UTCGHSA enrichment
  38. 2026-09-12 20:48 UTCEG score recompute
  39. 2026-09-12 20:48 UTCGHSA enrichment
  40. 2026-09-12 07:58 UTCGHSA enrichment
  41. 2026-09-11 19:08 UTCEG score recompute
  42. 2026-09-11 19:07 UTCGHSA enrichment
  43. 2026-09-11 14:53 UTCEPSS rescore
  44. 2026-09-11 14:53 UTCEPSS rescore
  45. 2026-09-11 06:14 UTCGHSA enrichment
  46. 2026-09-10 17:24 UTCEG score recompute
  47. 2026-09-10 17:24 UTCGHSA enrichment
  48. 2026-09-10 04:34 UTCGHSA enrichment
  49. 2026-09-10 04:02 UTCGHSA enrichment
  50. 2026-09-09 18:08 UTCGHSA enrichment
  51. 2026-09-09 15:53 UTCEG score recompute
  52. 2026-09-09 15:53 UTCGHSA enrichment
  53. 2026-09-09 15:29 UTCGHSA enrichment
  54. 2026-09-09 14:20 UTCEG score recompute▲ 2.70
  55. 2026-09-09 14:20 UTCGHSA enrichment
  56. 2026-09-09 14:20 UTCMITRE cvelistV5CVSS v3 → 8.1 · severity → HIGH
  57. 2026-09-09 01:22 UTCNVD update
  58. 2026-09-09 00:58 UTCEG score recompute
  59. 2026-09-09 00:57 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-87509?
CVE-2026-87509 is a high vulnerability published on September 9, 2026. Incorrect authorization in Updater in Google Chrome on on Windows prior to 153.0.8010.36 allowed a local attacker to execute arbitrary code outside the sandbox via a local program. (Chromium security severity: Low)
When was CVE-2026-87509 disclosed?
CVE-2026-87509 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-2026-87509 actively exploited?
CVE-2026-87509 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 98.3% of all scored CVEs.
What is the CVSS score of CVE-2026-87509?
CVE-2026-87509 has a CVSS v3.1 base score of 8.1 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-87509?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-87509, 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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