CVE-2026-92065

Sandbox escape via Win32 boundary error

Published Sep 15, 2026 · Updated Sep 15, 2026

Incorrect boundary conditions in Mozilla Firefox before 156 and Firefox ESR before 153.3 allow attackers to escape the Windows sandbox. The available source identifies the Widget: Win32 component but does not disclose the affected function, boundary check, or malformed input. Exploitation requires Windows and prior execution inside a sandboxed Firefox process; the documented consequence is escape from that sandbox.

CVSS severityUnavailable
Unscored
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect boundary conditions in Mozilla Firefox before 156 and Firefox ESR before 153.3 allow attackers to escape the Windows sandbox. The available source identifies the Widget: Win32 component but does not disclose the affected function, boundary check, or malformed input. Exploitation requires Windows and prior execution inside a sandboxed Firefox process; the documented consequence is escape from that sandbox.

The record

CVE
CVE-2026-92065
Published
Sep 15, 2026
Updated
Sep 15, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1068
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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