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VulnerabilityCVE-2026-12297Published 2026-06-16

CVE-2026-12297 — Mozilla Firefox

critical

As of 2026-07-15, CVE-2026-12297 is a CRITICAL-severity vulnerability in Mozilla Firefox, CVSS v3.1 9.6, EPSS 0.3% (31.3th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-12297, most recently “Multiple Vulnerabilities in Firefox 152 Enable Remote Code Execution and Sandbox Escape (MFSA 2026-57)”.

CVSS v3.1
9.6/10Critical
EPSS
0.3%Higher than 31.3% of scored CVEs
CISA KEV
NoNot in the KEV catalog
Tracked threats
1Campaigns referencing it
Priority
6.1/10Threadlinqs triage score
Published
Updated 2026-07-15
CVSS v3.1 9.6 (CRITICAL) · EPSS 0.3% (higher than 31.3% of all scored CVEs) · Priority 6.1/10 · Published 2026-06-16

Last updated:

What is CVE-2026-12297?

Sandbox escape due to incorrect boundary conditions in the Networking component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.

The record classifies CVE-2026-12297 under weakness classes CWE-119, CWE-653. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs a user to take an action first, and has high impact on confidentiality, integrity, availability. 2 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 116 days ago.

Severity and exploitation probability

CVSS v3.1 base score
9.6 — CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
EPSS (FIRST)
0.3% probability of exploitation in the next 30 days, higher than 31.3% of all scored CVEs
CISA KEV
Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority
6.1/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published
2026-06-16, last modified 2026-07-15

Is CVE-2026-12297 being exploited?

It currently carries a trending score of 14 in the Threadlinqs vulnerability feed.

Affected products and versions

How to fix CVE-2026-12297

Vendor advisory: https://www.mozilla.org/security/advisories/mfsa2026-57/. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.

Threat activity tracking CVE-2026-12297

1 tracked threat in the Threadlinqs corpus references CVE-2026-12297, either in the campaign’s CVE list or as an indicator on the campaign record.

Sources

Enriched from CVE.org, NVD, FIRST EPSS. Last verified by Threadlinqs on . This product uses the NVD API but is not endorsed or certified by the NVD.

Other references

Showing 5 of 6 recorded references.