CVE-2026-12295

VendormozillaProductfirefox, thunderbirdDiscoveredJun 16, 2026UpdatedOct 26, 2026

Sandbox escape in the DOM: Navigation component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.

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CVSS v3.1

9.6 CRITICAL

EPSS

0.39%

probability of exploitation in 30 days

CISA KEV

Not listed

no confirmed exploitation reported

News coverage

sources referencing this CVE

Related IOCs

seen in the same coverage

CVSS v3.1 Detail

Attack VectorNETWORK

Attack ComplexityLOW

Privileges RequiredNONE

User InteractionREQUIRED

ScopeCHANGED

ConfidentialityHIGH

IntegrityHIGH

AvailabilityHIGH

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

Connections

4 relationships

Timeline

disclosure → media coverage

Jun 16, 2026

Disclosure — published as a CVE record. · last revised by NVD Oct 26, 2026

Public PoC (1)

github.com/SneakyNachos/CVE-2026-12295-UXXS-in-my-wasm

Unverified third-party code — review before executing.