Sandbox escape in the Profile Backup component
Published May 12, 2026
9.8
CRITICALCVSS 3.1
EPSS 0.60%
Description
Sandbox escape in the Profile Backup component. This vulnerability was fixed in Firefox 150.0.3, Firefox ESR 115.36, Firefox ESR 140.11, and Thunderbird 140.11.
Affected products
No data.
No data.
Red Hat Enterprise Linux 10
firefox-0:140.11.0-1.el10_2
Fixed · RHSA-2026:21380
Red Hat Enterprise Linux 10
thunderbird-0:140.11.0-1.el10_2
Fixed · RHSA-2026:22325
Red Hat Enterprise Linux 10.0 Extended Update Support
firefox-0:140.11.0-1.el10_0
Fixed · RHSA-2026:27715
Red Hat Enterprise Linux 10.0 Extended Update Support
thunderbird-0:140.11.0-1.el10_0
Fixed · RHSA-2026:26539
Red Hat Enterprise Linux 7 Extended Lifecycle Support
firefox-0:140.11.0-1.el7_9
Fixed · RHSA-2026:26551
Red Hat Enterprise Linux 8
firefox-0:140.11.0-1.el8_10
Fixed · RHSA-2026:21382
Red Hat Enterprise Linux 8
thunderbird-0:140.11.0-1.el8_10
Fixed · RHSA-2026:22643
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
firefox-0:140.11.0-1.el8_4
Fixed · RHSA-2026:26629
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
thunderbird-0:140.11.0-1.el8_4
Fixed · RHSA-2026:26270
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On
firefox-0:140.11.0-1.el8_4
Fixed · RHSA-2026:26629
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On
thunderbird-0:140.11.0-1.el8_4
Fixed · RHSA-2026:26270
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
firefox-0:140.11.0-1.el8_6
Fixed · RHSA-2026:26606
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
thunderbird-0:140.11.0-1.el8_6
Fixed · RHSA-2026:26536
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On
firefox-0:140.11.0-1.el8_6
Fixed · RHSA-2026:26606
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On
thunderbird-0:140.11.0-1.el8_6
Fixed · RHSA-2026:26536
Red Hat Enterprise Linux 8.8 Telecommunications Update Service
firefox-0:140.11.0-1.el8_8
Fixed · RHSA-2026:26630
Red Hat Enterprise Linux 8.8 Telecommunications Update Service
thunderbird-0:140.11.0-1.el8_8
Fixed · RHSA-2026:26268
Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
firefox-0:140.11.0-1.el8_8
Fixed · RHSA-2026:26630
Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
thunderbird-0:140.11.0-1.el8_8
Fixed · RHSA-2026:26268
Red Hat Enterprise Linux 9
firefox-0:140.11.0-1.el9_8
Fixed · RHSA-2026:21378
Red Hat Enterprise Linux 9
thunderbird-0:140.11.0-1.el9_8
Fixed · RHSA-2026:21381
Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions
firefox-0:140.11.0-1.el9_2
Fixed · RHSA-2026:26491
Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions
thunderbird-0:140.11.0-1.el9_2
Fixed · RHSA-2026:26269
Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions
firefox-0:140.11.0-1.el9_4
Fixed · RHSA-2026:26493
Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions
thunderbird-0:140.11.0-1.el9_4
Fixed · RHSA-2026:26174
Red Hat Enterprise Linux 9.6 Extended Update Support
firefox-0:140.11.0-1.el9_6
Fixed · RHSA-2026:26492
Red Hat Enterprise Linux 9.6 Extended Update Support
thunderbird-0:140.11.0-1.el9_6
Fixed · RHSA-2026:26521
Red Hat Enterprise Linux 10
rhel10/firefox-flatpak
Affected
Red Hat Enterprise Linux 10
rhel10/thunderbird-flatpak
Affected
Red Hat Enterprise Linux 6
firefox
Out of support scope
Red Hat Enterprise Linux 6
thunderbird
Out of support scope
Red Hat Enterprise Linux 7
thunderbird
Out of support scope
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 10 | firefox-0:140.11.0-1.el10_2 | Fixed | RHSA-2026:21380 |
| Red Hat Enterprise Linux 10 | thunderbird-0:140.11.0-1.el10_2 | Fixed | RHSA-2026:22325 |
| Red Hat Enterprise Linux 10.0 Extended Update Support | firefox-0:140.11.0-1.el10_0 | Fixed | RHSA-2026:27715 |
| Red Hat Enterprise Linux 10.0 Extended Update Support | thunderbird-0:140.11.0-1.el10_0 | Fixed | RHSA-2026:26539 |
| Red Hat Enterprise Linux 7 Extended Lifecycle Support | firefox-0:140.11.0-1.el7_9 | Fixed | RHSA-2026:26551 |
| Red Hat Enterprise Linux 8 | firefox-0:140.11.0-1.el8_10 | Fixed | RHSA-2026:21382 |
| Red Hat Enterprise Linux 8 | thunderbird-0:140.11.0-1.el8_10 | Fixed | RHSA-2026:22643 |
| Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support | firefox-0:140.11.0-1.el8_4 | Fixed | RHSA-2026:26629 |
| Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support | thunderbird-0:140.11.0-1.el8_4 | Fixed | RHSA-2026:26270 |
| Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On | firefox-0:140.11.0-1.el8_4 | Fixed | RHSA-2026:26629 |
| Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On | thunderbird-0:140.11.0-1.el8_4 | Fixed | RHSA-2026:26270 |
| Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support | firefox-0:140.11.0-1.el8_6 | Fixed | RHSA-2026:26606 |
| Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support | thunderbird-0:140.11.0-1.el8_6 | Fixed | RHSA-2026:26536 |
| Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On | firefox-0:140.11.0-1.el8_6 | Fixed | RHSA-2026:26606 |
| Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On | thunderbird-0:140.11.0-1.el8_6 | Fixed | RHSA-2026:26536 |
| Red Hat Enterprise Linux 8.8 Telecommunications Update Service | firefox-0:140.11.0-1.el8_8 | Fixed | RHSA-2026:26630 |
| Red Hat Enterprise Linux 8.8 Telecommunications Update Service | thunderbird-0:140.11.0-1.el8_8 | Fixed | RHSA-2026:26268 |
| Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions | firefox-0:140.11.0-1.el8_8 | Fixed | RHSA-2026:26630 |
| Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions | thunderbird-0:140.11.0-1.el8_8 | Fixed | RHSA-2026:26268 |
| Red Hat Enterprise Linux 9 | firefox-0:140.11.0-1.el9_8 | Fixed | RHSA-2026:21378 |
| Red Hat Enterprise Linux 9 | thunderbird-0:140.11.0-1.el9_8 | Fixed | RHSA-2026:21381 |
| Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions | firefox-0:140.11.0-1.el9_2 | Fixed | RHSA-2026:26491 |
| Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions | thunderbird-0:140.11.0-1.el9_2 | Fixed | RHSA-2026:26269 |
| Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions | firefox-0:140.11.0-1.el9_4 | Fixed | RHSA-2026:26493 |
| Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions | thunderbird-0:140.11.0-1.el9_4 | Fixed | RHSA-2026:26174 |
| Red Hat Enterprise Linux 9.6 Extended Update Support | firefox-0:140.11.0-1.el9_6 | Fixed | RHSA-2026:26492 |
| Red Hat Enterprise Linux 9.6 Extended Update Support | thunderbird-0:140.11.0-1.el9_6 | Fixed | RHSA-2026:26521 |
| Red Hat Enterprise Linux 10 | rhel10/firefox-flatpak | Affected | n/a |
| Red Hat Enterprise Linux 10 | rhel10/thunderbird-flatpak | Affected | n/a |
| Red Hat Enterprise Linux 6 | firefox | Out of support scope | n/a |
| Red Hat Enterprise Linux 6 | thunderbird | Out of support scope | n/a |
| Red Hat Enterprise Linux 7 | thunderbird | Out of support scope | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.
References (35)
- https://access.redhat.com/errata/RHSA-2026:21378
- https://access.redhat.com/errata/RHSA-2026:21380
- https://access.redhat.com/errata/RHSA-2026:21381
- https://access.redhat.com/errata/RHSA-2026:21382
- https://access.redhat.com/errata/RHSA-2026:22325
- https://access.redhat.com/errata/RHSA-2026:22643
- https://access.redhat.com/errata/RHSA-2026:26174
- https://access.redhat.com/errata/RHSA-2026:26268
- https://access.redhat.com/errata/RHSA-2026:26269
- https://access.redhat.com/errata/RHSA-2026:26270
- https://access.redhat.com/errata/RHSA-2026:26491
- https://access.redhat.com/errata/RHSA-2026:26492
- https://access.redhat.com/errata/RHSA-2026:26493
- https://access.redhat.com/errata/RHSA-2026:26521
- https://access.redhat.com/errata/RHSA-2026:26536
- https://access.redhat.com/errata/RHSA-2026:26539
- https://access.redhat.com/errata/RHSA-2026:26551
- https://access.redhat.com/errata/RHSA-2026:26606
- https://access.redhat.com/errata/RHSA-2026:26629
- https://access.redhat.com/errata/RHSA-2026:26630
- https://access.redhat.com/errata/RHSA-2026:27715
- https://access.redhat.com/security/cve/CVE-2026-8401 Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=2038679 Permissions Required
- https://bugzilla.redhat.com/show_bug.cgi?id=2476492 Issue Tracking
- https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-29493 Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2026-8401
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-8401.json
- https://www.cve.org/CVERecord?id=CVE-2026-8401
- https://www.mozilla.org/security/advisories/mfsa2026-45/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-45/#CVE-2026-8401
- https://www.mozilla.org/security/advisories/mfsa2026-47/
- https://www.mozilla.org/security/advisories/mfsa2026-48/
- https://www.mozilla.org/security/advisories/mfsa2026-48/#CVE-2026-8401
- https://www.mozilla.org/security/advisories/mfsa2026-51/
- https://www.mozilla.org/security/advisories/mfsa2026-51/#CVE-2026-8401
Change history (0)
No recorded changes yet.
CVE.org / MITRE
CISA Vulnrichment
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