CVE-2026-87646

CRITICALPre-NVD 9.69.6—
EchelonGraph scoreHIGH confidence

Score 9.6 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-09. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.6; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 4 sources updated this week
9.6EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.6Exploit: None knownExposed: 0

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

Use after free in Web Authentication in Google Chrome prior to 153.0.8010.36 allowed a remote attacker to execute arbitrary code outside the sandbox via a crafted HTML page. (Chromium security severity: High)

CVSS v3
9.6
Vendor severity
HIGHper Google (Chromium)Vendor's own band, not a CVSS rating — advisory text: (Chromium security severity: High)
EG Score
9.6(high)
EG Risk
43(Track)
EG Risk 43/100SSVC: 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
Severity96% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
42%
KEV
Not listed

Published

September 9, 2026

Last Modified

September 10, 2026

Advisory Details (2)

Auto-updated Sep 22, 2026
⚠️ Active exploitation confirmed. No patch confirmed yet.
generic

Chromium

https://issues.chromium.org/issues/539754136
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-2026-87646(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 100× in last 7d / 201× 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.

Showing the most recent 100 of 201 total refreshes for this CVE.

  1. 2026-09-25 10:59 UTCGHSA enrichment
  2. 2026-09-25 07:03 UTCVendor advisory
  3. 2026-09-25 07:03 UTCGHSA enrichment
  4. 2026-09-25 03:11 UTCVendor advisory
  5. 2026-09-25 03:11 UTCGHSA enrichment
  6. 2026-09-24 23:14 UTCVendor advisory
  7. 2026-09-24 23:14 UTCGHSA enrichment
  8. 2026-09-24 19:23 UTCVendor advisory
  9. 2026-09-24 19:23 UTCGHSA enrichment
  10. 2026-09-24 15:31 UTCEG score recompute
  11. 2026-09-24 15:31 UTCVendor advisory
  12. 2026-09-24 15:31 UTCGHSA enrichment
  13. 2026-09-24 14:04 UTCEPSS rescore
  14. 2026-09-24 11:37 UTCVendor advisory
  15. 2026-09-24 11:37 UTCGHSA enrichment
  16. 2026-09-24 07:46 UTCVendor advisory
  17. 2026-09-24 07:45 UTCGHSA enrichment
  18. 2026-09-24 03:54 UTCVendor advisory
  19. 2026-09-24 03:54 UTCGHSA enrichment
  20. 2026-09-24 00:03 UTCVendor advisory
  21. 2026-09-24 00:03 UTCGHSA enrichment
  22. 2026-09-23 20:11 UTCEG score recompute
  23. 2026-09-23 20:11 UTCVendor advisory
  24. 2026-09-23 20:11 UTCGHSA enrichment
  25. 2026-09-23 17:54 UTCEPSS rescore
Show 75 more
  1. 2026-09-23 16:20 UTCVendor advisory
  2. 2026-09-23 16:20 UTCGHSA enrichment
  3. 2026-09-23 12:28 UTCVendor advisory
  4. 2026-09-23 12:28 UTCGHSA enrichment
  5. 2026-09-23 08:37 UTCVendor advisory
  6. 2026-09-23 08:37 UTCGHSA enrichment
  7. 2026-09-23 04:46 UTCVendor advisory
  8. 2026-09-23 04:46 UTCGHSA enrichment
  9. 2026-09-23 00:55 UTCVendor advisory
  10. 2026-09-23 00:55 UTCGHSA enrichment
  11. 2026-09-22 21:04 UTCVendor advisory
  12. 2026-09-22 21:04 UTCGHSA enrichment
  13. 2026-09-22 17:12 UTCEG score recompute
  14. 2026-09-22 17:12 UTCVendor advisory
  15. 2026-09-22 17:12 UTCGHSA enrichment
  16. 2026-09-22 16:01 UTCEPSS rescore
  17. 2026-09-22 13:02 UTCVendor advisory
  18. 2026-09-22 13:02 UTCGHSA enrichment
  19. 2026-09-22 09:11 UTCVendor advisory
  20. 2026-09-22 09:11 UTCGHSA enrichment
  21. 2026-09-22 05:20 UTCVendor advisory
  22. 2026-09-22 05:20 UTCGHSA enrichment
  23. 2026-09-22 01:29 UTCVendor advisory
  24. 2026-09-22 01:29 UTCGHSA enrichment
  25. 2026-09-21 21:38 UTCEG score recompute
  26. 2026-09-21 21:38 UTCVendor advisory
  27. 2026-09-21 21:37 UTCGHSA enrichment
  28. 2026-09-21 21:09 UTCEPSS rescore
  29. 2026-09-21 17:46 UTCVendor advisory
  30. 2026-09-21 17:46 UTCGHSA enrichment
  31. 2026-09-21 13:53 UTCVendor advisory
  32. 2026-09-21 13:53 UTCGHSA enrichment
  33. 2026-09-21 10:02 UTCVendor advisory
  34. 2026-09-21 10:02 UTCGHSA enrichment
  35. 2026-09-21 06:11 UTCVendor advisory
  36. 2026-09-21 06:11 UTCGHSA enrichment
  37. 2026-09-21 02:19 UTCVendor advisory
  38. 2026-09-21 02:19 UTCGHSA enrichment
  39. 2026-09-20 22:27 UTCEG score recompute
  40. 2026-09-20 22:27 UTCVendor advisory
  41. 2026-09-20 22:27 UTCGHSA enrichment
  42. 2026-09-20 20:16 UTCEPSS rescore
  43. 2026-09-20 18:36 UTCVendor advisory
  44. 2026-09-20 18:36 UTCGHSA enrichment
  45. 2026-09-20 14:45 UTCVendor advisory
  46. 2026-09-20 14:45 UTCGHSA enrichment
  47. 2026-09-20 10:54 UTCVendor advisory
  48. 2026-09-20 10:54 UTCGHSA enrichment
  49. 2026-09-20 07:03 UTCVendor advisory
  50. 2026-09-20 07:03 UTCGHSA enrichment
  51. 2026-09-20 03:07 UTCVendor advisory
  52. 2026-09-20 03:07 UTCGHSA enrichment
  53. 2026-09-19 23:15 UTCVendor advisory
  54. 2026-09-19 23:15 UTCGHSA enrichment
  55. 2026-09-19 19:24 UTCEG score recompute
  56. 2026-09-19 19:24 UTCVendor advisory
  57. 2026-09-19 19:24 UTCGHSA enrichment
  58. 2026-09-19 15:33 UTCVendor advisory
  59. 2026-09-19 15:32 UTCGHSA enrichment
  60. 2026-09-19 11:39 UTCVendor advisory
  61. 2026-09-19 11:39 UTCGHSA enrichment
  62. 2026-09-19 07:38 UTCVendor advisory
  63. 2026-09-19 07:38 UTCGHSA enrichment
  64. 2026-09-19 03:47 UTCVendor advisory
  65. 2026-09-19 03:47 UTCGHSA enrichment
  66. 2026-09-18 23:56 UTCVendor advisory
  67. 2026-09-18 23:56 UTCGHSA enrichment
  68. 2026-09-18 20:05 UTCEG score recompute
  69. 2026-09-18 20:05 UTCVendor advisory
  70. 2026-09-18 20:05 UTCGHSA enrichment
  71. 2026-09-18 19:28 UTCEPSS rescore
  72. 2026-09-18 16:13 UTCVendor advisory
  73. 2026-09-18 16:13 UTCGHSA enrichment
  74. 2026-09-18 11:40 UTCVendor advisory
  75. 2026-09-18 11:40 UTCGHSA enrichment

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-87646?
CVE-2026-87646 is a critical vulnerability published on September 9, 2026. Use after free in Web Authentication in Google Chrome prior to 153.0.8010.36 allowed a remote attacker to execute arbitrary code outside the sandbox via a crafted HTML page. (Chromium security severity: High)
When was CVE-2026-87646 disclosed?
CVE-2026-87646 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-2026-87646 actively exploited?
CVE-2026-87646 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 58.0% of all scored CVEs.
What is the CVSS score of CVE-2026-87646?
CVE-2026-87646 has a CVSS v3.1 base score of 9.6 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-87646?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-87646, 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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