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TI-2026-82523 Aliases CVE-2026-85899GHSA-c446-4g2q-c2xx

Use after free in Microsoft Edge allows privilege escalation

Priority LOW 38CWE-416Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

Use after free in Microsoft Edge (Chromium-based) lets an authorized attacker escalate privileges over a network. The flaw is tracked as CWE-416, and the source gives a CVSS 3.1 base score of 8.1 for it. Edge versions from 1.0.0.0 before 155.0.4283.45 are affected.

Written with Claude Haiku 5.5 from the sources below · 2026-10-30

Description from the CNA

Use after free in Microsoft Edge (Chromium-based) allows an authorized attacker to elevate privileges over a network.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00642 51st percentileScored 2026-11-07
Fix Fixed Microsoft Edge (Chromium-based) (Microsoft): 155.0.4283.45

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
MicrosoftMicrosoft Edge (Chromium-based)1.0.0.0 to before 155.0.4283.45155.0.4283.45Patch availableCNA
  • Microsoft Edge (Chromium-based) VendorMicrosoft Affected 1.0.0.0 to before 155.0.4283.45 Fixed in 155.0.4283.45 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:microsoft:edge_chromium:*:*:*:*:*:*:*:*before 155.0.4283.45VulnerableMicrosoft
  • cpe:2.3:a:microsoft:edge_chromium:*:*:*:*:*:*:*:* Versions before 155.0.4283.45 Vulnerable ·Microsoft

Remediation

Update Microsoft Edge (Chromium-based) to version 155.0.4283.45 or later.

Written with Claude Haiku 5.5 from the sources below · 2026-10-30

  • Fix · CNA Microsoft Edge (Chromium-based) (Microsoft) Fixed in 155.0.4283.45

Timeline

  1. 2026-10-29 Threatist record created from CVE-2026-85899
  2. 2026-10-29 Alias added: GHSA-c446-4g2q-c2xx
  3. 2026-10-30 CISA SSVC decision points changed
  4. 2026-10-30 Priority changed: MEDIUM → LOW
  5. 2026-10-30 CISA SSVC decision points changed

References

Patch 1

  • TI-2023-05824 Integer overflow in Google Chrome KEVCVSS 3.1CRITICAL 9.6
  • TI-2022-03781 Out-of-bounds write in Google Chrome KEVCVSS 3.1CRITICAL 9.6
  • TI-2025-12953 Memory corruption in Google Chrome KEVCVSS 3.1HIGH 8.8
  • TI-2025-04867 Out-of-bounds read in Google Chrome KEVCVSS 3.1HIGH 8.8
  • TI-2024-07384 Out-of-bounds write in Google Chrome KEVCVSS 3.1HIGH 8.8
  • TI-2023-04799 Out-of-bounds write in Google Chrome KEVCVSS 3.1HIGH 8.8
See all 325 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences