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CVE-2026-92048

Mozilla Firefox buffer overflow

9.0 CRITICALEPSS 0.28%
  1. Published15 Sept 2026

Description

Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionRequired
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

Affected products

Mozilla Firefox≥ 154.0.0 < 156.0.0 · < 153.3.0
Mozilla Thunderbird≥ 154.0 < 156.0 · < 153.3.0

Remediation

Fixed in
Mozilla Firefox≥ 156.0.0
Mozilla Thunderbird≥ 156.0

References

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Frequently asked

Is CVE-2026-92048 being actively exploited?

CVE-2026-92048 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.28%.

How severe is CVE-2026-92048?

CVE-2026-92048 has a CVSS 3.1 base score of 9.0, rated critical. EPSS estimates a 0.28% probability of exploitation.

Which products are affected by CVE-2026-92048?

Affected products include Mozilla Firefox, Mozilla Thunderbird.

How do I fix CVE-2026-92048?

Upgrade affected software to a fixed version, for example Mozilla Firefox 156.0.0, Mozilla Thunderbird 156.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-92048 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.