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CVE-2026-85899high8.1

Microsoft Edge (Chromium-based) Elevation of Privilege Vulnerability

Impact

Microsoft Edge (Chromium-based) versions before 155.0.4283.45 have a use-after-free weakness, allowing an authorized attacker to elevate privileges. The impact and required access are not fully specified.

Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.

Affected packages

This source has no supported package-version data for matching. You can read the advisory here, but this record alone cannot power a dependency check.

Affected products

Vendor version evidence. Product records are separate from automatic dependency matching.

Microsoft · microsoft

Microsoft Edge (Chromium-based)

1 range
microsoft version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

1.0.0.0 → before 155.0.4283.45

custom versions

unaffected

unknown

Other versions: unknown

Original source description

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

Inside the record

Evidence available

Package identity · not supplied
Version evidence
Remediation guidance · not supplied
Weakness classification
Additional publishers

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-85899

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Underlying weaknesses

The source’s classification of what caused the vulnerability.

CWE-416 ↗

CWE-416: Use After Free

microsoft

Related →

Environment requirements

These conditions apply together as specified by the publisher. A matching product name alone does not establish exposure.

microsoft · platform conditions

Any condition may hold

Vulnerable product

cpe:2.3:a:microsoft:edge_chromium:*:*:*:*:*:*:*:*

From (inclusive): 1.0.0.0

Before: 155.0.4283.45

Original applicability statements
[
  {
    "nodes": [
      {
        "operator": "OR",
        "negate": false,
        "cpeMatch": [
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:a:microsoft:edge_chromium:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "1.0.0.0",
            "versionEndExcluding": "155.0.4283.45"
          }
        ]
      }
    ]
  }
]
Contributing organizations · 2
microsoft

Assigning organization

2026-10-30
CISA-ADP

Additional data publisher

2026-10-30

What changed

Follow changes
  1. CVE · CVE-2026-85899

    Observed 2026-10-30T19:27:19.147Z · upstream updated 2026-10-30T19:15:04.554Z

    Prioritization updated

    before

    [
  {
    "source": "CISA-ADP",
    "type": "SSVC",
    "role": "CISA Coordinator",
    "timestamp": "2026-10-29T00:00:00+00:00",
    "decisions": [
      {
        "name": "Exploitation",
        "value": "none"
      },
      {
        "name": "Automatable",
        "value": "no"
      },
      {
        "name": "Technical Impact",
        "value": "total"
      }
    ]
  }
]

    after

    [
  {
    "source": "CISA-ADP",
    "type": "SSVC",
    "role": "CISA Coordinator",
    "timestamp": "2026-10-30T03:56:34.266155Z",
    "decisions": [
      {
        "name": "Exploitation",
        "value": "none"
      },
      {
        "name": "Automatable",
        "value": "no"
      },
      {
        "name": "Technical Impact",
        "value": "total"
      }
    ]
  }
]
  2. CVE · CVE-2026-85899

    Observed 2026-10-30T04:20:36.682Z · upstream updated 2026-10-30T03:56:33.680Z

    Prioritization updated

    before

    []

    after

    [
  {
    "source": "CISA-ADP",
    "type": "SSVC",
    "role": "CISA Coordinator",
    "timestamp": "2026-10-29T00:00:00+00:00",
    "decisions": [
      {
        "name": "Exploitation",
        "value": "none"
      },
      {
        "name": "Automatable",
        "value": "no"
      },
      {
        "name": "Technical Impact",
        "value": "total"
      }
    ]
  }
]

Large field values are marked as truncated previews. Original source snapshots remain retained.

Showing up to 50 most recent observed changes.

References

1 sources
msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85899
vendor-advisorymicrosoft