Predictive Vulnerability Intelligence.

Product

  • Product
  • Pricing
  • Documentation

Company

  • About
  • Partnerships
  • Blog
  • Support

Legal

  • Terms
  • Privacy
  • Data Licensing

© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2026-12296

34
FAUCET Score

Sandbox escape in the Security: Process Sandboxing component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.

First published: Jun 16, 2026Last modified: Jun 16, 2026

Impacted Technologies

VendorProductVersion(s)CPE
< 140.12.0CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*
< 152.0.0CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*
< 140.12.0CPE matchmatch criteria
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*
< 152.0.0CPE matchmatch criteria
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.6CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
6.0
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.39%
Probability of exploitation in next 30 days
EPSS Percentile
31.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0039 is in the 36th percentile among its peer group of 834 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.8 Bluesky, 0.5 Mastodon, and 1.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.1 Security Researcher mentions.

Remediation

Vendor Patches (1)

mozillavendor investigatingvia nvd_reference
View patch

References

access.redhat.com / errata/RHSA-2026:27717
access.redhat.com / errata/RHSA-2026:27733
access.redhat.com / errata/RHSA-2026:27734
access.redhat.com / errata/RHSA-2026:29940
access.redhat.com / errata/RHSA-2026:30846
access.redhat.com / errata/RHSA-2026:33445
access.redhat.com / errata/RHSA-2026:36100
access.redhat.com / errata/RHSA-2026:36101
access.redhat.com / errata/RHSA-2026:36102
access.redhat.com / errata/RHSA-2026:36103
access.redhat.com / errata/RHSA-2026:37210
access.redhat.com / errata/RHSA-2026:37391
access.redhat.com / errata/RHSA-2026:38506
access.redhat.com / errata/RHSA-2026:38750
access.redhat.com / errata/RHSA-2026:38751
access.redhat.com / errata/RHSA-2026:38753
access.redhat.com / errata/RHSA-2026:39011
access.redhat.com / errata/RHSA-2026:39141
access.redhat.com / errata/RHSA-2026:39142
access.redhat.com / errata/RHSA-2026:39428
access.redhat.com / errata/RHSA-2026:39706
access.redhat.com / security/cve/CVE-2026-12296
bugzilla.redhat.com / show_bug.cgi
security.access.redhat.com / data/csaf/v2/vex/2026/cve-2026-12296.json
bugzilla.mozilla.org / show_bug.cgi
Permissions Required
mozilla.org / security/advisories/mfsa2026-57
Vendor Advisory
mozilla.org / security/advisories/mfsa2026-58
Vendor Advisory
mozilla.org / security/advisories/mfsa2026-60
Vendor Advisory
mozilla.org / security/advisories/mfsa2026-61
Vendor Advisory