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CVE-2026-66313· NVD / CVE Program· CNA microsoft

Microsoft Edge (Chromium-based) Tampering Vulnerability

Noroxi assessment

Priority: Monitor (action score 27/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.23% (FIRST EPSS).
  • Someone with local access to the system can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Microsoft Edge (Chromium-based) 151.0.4129.59.

Low priority for now. Upgrade to Microsoft Edge (Chromium-based) 151.0.4129.59 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Origin validation error in Microsoft Edge (Chromium-based) allows an unauthorized attacker to perform tampering locally.

MediumCVSS 6.8 · v3.1—No exploit Fix available
Published
Aug 4, 2026
Updated
Oct 23, 2026
EPSS
0.2% · 13th percentile

Report tools

JSON

Action score

27

Monitor

Low priority for now.

CVSS
27 / 40 · 6.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · microsoft
6.8
NVD has not scored this yet; the score shown is the CNA’s.

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N/E:U/RL:O/RC:C

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-66313

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
microsoftedge chromium

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • microsoft edge chromiumbefore 151.0.4129.59

Versions reported by the vendor

Affected version ranges reported by the assigning authority (microsoft). Independent of NVD's CPE analysis and usually ahead of it.

  • Microsoft Microsoft Edge (Chromium-based)

    • 1.0.0.0 and later · before 151.0.4129.59affected

Same product

microsoft: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-57983Microsoft Edge (Chromium-based) Security Feature Bypass Vulnerability
    40Plan
  • CVE-2026-45495Microsoft Edge (Chromium-based) Remote Code Execution Vulnerability
    39Monitor
  • CVE-2024-43566Microsoft Edge (Chromium-based) Remote Code Execution Vulnerability
    39Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2026-66311Aug 4, 2026 · Microsoft Edge (Chromium-based) Tampering Vulnerability
    24Monitor
  • ← EarlierCVE-2026-66312Aug 4, 2026 · Microsoft Edge (Chromium-based) Remote Code Execution Vulnerability
    35Monitor
  • Later →CVE-2026-66314Aug 4, 2026 · Microsoft Edge (Chromium-based) Information Disclosure Vulnerability
    21Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Microsoft Edge (Chromium-based)151.0.4129.59 · Release NotesMicrosoft (MSRC)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-663180 days apartMicrosoft Edge (Chromium-based) Information Disclosure Vulnerability
    32Monitor
  • CVE-2026-579899 days apartMicrosoft Edge (Chromium-based) Information Disclosure Vulnerability
    29Monitor
  • CVE-2026-663160 days apartMicrosoft Edge (Chromium-based) Spoofing Vulnerability
    21Monitor
  • CVE-2026-663170 days apartMicrosoft Edge (Chromium-based) Tampering Vulnerability
    21Monitor
  • CVE-2026-663220 days apartMicrosoft Edge (Chromium-based) Spoofing Vulnerability
    21Monitor
  • CVE-2026-579789 days apartMicrosoft Edge (Chromium-based) Spoofing Vulnerability
    21Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
low · data or configuration can be modified
Availability
none
Attack vector
Local
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
Low
Availability impact
None

Weakness class (CWE)

CWE-346 · Origin Validation Error

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records