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TI-2026-10584 Aliases CVE-2026-12311GHSA-3pp7-m8f5-89gx

Information disclosure in Mozilla Firefox

Priority LOW 21CWE-200Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Information disclosure
Confidentiality · integrity · availability
Low · None · None
Fix status
Partial Red Hat: 14 fixed, 3 without a fix

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat. Impact type from CWE-200.

Summary

Information disclosure, 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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00185 8th percentileScored 2026-11-07
Fix Partial Firefox (Mozilla): 140.12, 152Thunderbird (Mozilla): 140.12, 152Red Hat: 21 advisoriesRed Hat: 14 fixed, 3 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
MozillaFirefox—140.12, 152Patch availableCNA
MozillaThunderbird—140.12, 152Patch availableCNA
  • Firefox VendorMozilla Affected — Fixed in 140.12, 152 Patch available CNA
  • Thunderbird VendorMozilla Affected — Fixed in 140.12, 152 Patch available CNA

CPE configurations NVD · 4

CPEVersionsRoleVendor
cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*before 152.0VulnerableMozilla
cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*140.0 to before 140.12.0VulnerableMozilla
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*before 152.0.0VulnerableMozilla
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*140.0 to before 140.12.0VulnerableMozilla
  • cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:* Versions before 152.0 Vulnerable ·Mozilla
  • cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:* Versions 140.0 to before 140.12.0 Vulnerable ·Mozilla
  • cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:* Versions before 152.0.0 Vulnerable ·Mozilla
  • cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:* Versions 140.0 to before 140.12.0 Vulnerable ·Mozilla

Remediation

  • Fix · CNA Firefox (Mozilla) Fixed in 140.12, 152
  • Fix · CNA Thunderbird (Mozilla) Fixed in 140.12, 152

Red Hat 21 advisories

  • RHSA-2026:39706 Released 2026-07-15 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) thunderbird-140.12.0-1.el9_2
  • RHSA-2026:39428 Released 2026-07-14 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.4) thunderbird-140.12.0-1.el8_4
    • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) thunderbird-140.12.0-1.el8_4
  • RHSA-2026:39142 Released 2026-07-14 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream E4S (v.8.8) thunderbird-140.12.0-1.el8_8
    • Red Hat Enterprise Linux AppStream TUS (v.8.8) thunderbird-140.12.0-1.el8_8
Show 18 more Red Hat advisories
  • RHSA-2026:39141 Released 2026-07-14 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.6) thunderbird-140.12.0-1.el8_6
    • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) thunderbird-140.12.0-1.el8_6
  • RHSA-2026:39011 Released 2026-07-13 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.4) firefox-140.12.0-1.el9_4, firefox-x11-140.12.0-1.el9_4
  • RHSA-2026:38750 Released 2026-07-13 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) thunderbird-140.12.0-1.el9_6
  • RHSA-2026:38753 Released 2026-07-13 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.4) thunderbird-140.12.0-1.el9_4
  • RHSA-2026:38751 Released 2026-07-13 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) thunderbird-140.12.0-1.el10_0
  • RHSA-2026:38506 Released 2026-07-13 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux Server (v. 7 ELS) firefox-140.12.0-1.el7_9
  • RHSA-2026:37391 Released 2026-07-09 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) firefox-140.12.0-1.el9_6, firefox-x11-140.12.0-1.el9_6
  • RHSA-2026:37210 Released 2026-07-09 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.6) firefox-140.12.0-1.el8_6
    • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) firefox-140.12.0-1.el8_6
  • RHSA-2026:36101 Released 2026-07-07 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) firefox-140.12.0-1.el9_2, firefox-x11-140.12.0-1.el9_2
  • RHSA-2026:36103 Released 2026-07-07 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream E4S (v.8.8) firefox-140.12.0-1.el8_8
    • Red Hat Enterprise Linux AppStream TUS (v.8.8) firefox-140.12.0-1.el8_8
  • RHSA-2026:36102 Released 2026-07-07 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.4) firefox-140.12.0-1.el8_4
    • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) firefox-140.12.0-1.el8_4
  • RHSA-2026:36100 Released 2026-07-07 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) firefox-140.12.0-1.el10_0
  • RHSA-2026:33445 Released 2026-06-30 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream (v. 8) thunderbird-140.12.0-1.el8_10
  • RHSA-2026:30846 Released 2026-06-29 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream (v. 10) thunderbird-140.12.0-1.el10_2
  • RHSA-2026:29940 Released 2026-06-25 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream (v. 9) thunderbird-140.12.0-1.el9_8
  • RHSA-2026:27734 Released 2026-06-22 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream (v. 9) firefox-140.12.0-1.el9_8, firefox-x11-140.12.0-1.el9_8
  • RHSA-2026:27733 Released 2026-06-22 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream (v. 10) firefox-140.12.0-1.el10_2
  • RHSA-2026:27717 Released 2026-06-22 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream (v. 8) firefox-140.12.0-1.el8_10

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 10AffectedNo fix yet
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 7AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:27733, RHSA-2026:30846
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2026:27717, RHSA-2026:33445
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:27734, RHSA-2026:29940
Red Hat Enterprise Linux AppStream AUS (v.8.4)Fixed RHSA-2026:36102, RHSA-2026:39428
Red Hat Enterprise Linux AppStream AUS (v.8.6)Fixed RHSA-2026:37210, RHSA-2026:39141
Red Hat Enterprise Linux AppStream E4S (v.8.8)Fixed RHSA-2026:36103, RHSA-2026:39142
Red Hat Enterprise Linux AppStream E4S (v.9.2)Fixed RHSA-2026:36101, RHSA-2026:39706
Red Hat Enterprise Linux AppStream E4S (v.9.4)Fixed RHSA-2026:38753, RHSA-2026:39011
Red Hat Enterprise Linux AppStream EUS (v. 10.0)Fixed RHSA-2026:36100, RHSA-2026:38751
Red Hat Enterprise Linux AppStream EUS (v.9.6)Fixed RHSA-2026:37391, RHSA-2026:38750
Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4)Fixed RHSA-2026:36102, RHSA-2026:39428
Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6)Fixed RHSA-2026:37210, RHSA-2026:39141
Red Hat Enterprise Linux AppStream TUS (v.8.8)Fixed RHSA-2026:36103, RHSA-2026:39142
Red Hat Enterprise Linux Server (v. 7 ELS)Fixed RHSA-2026:38506

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-12311
  2. 2026-10-03 Alias added: GHSA-3pp7-m8f5-89gx
  3. 2026-11-06 Fix available: RHSA-2026:27733 · Red Hat

References

Advisory 4

Other 1

  • TI-2024-08981 Use after free in Mozilla Firefox KEVCVSS 3.1CRITICAL 9.8
  • TI-2022-09832 Use after free in Mozilla Firefox KEVCVSS 3.1CRITICAL 9.6
  • TI-2019-08769 Improper input validation in Mozilla Firefox ESR KEVCVSS 3.1CRITICAL 10.0
  • TI-2010-03577 Mozilla Firefox 3.5.x through 3.5.14 and 3.6.x through 3.6.11, Thunderbird 3.1.6 before… KEVCVSS 3.1CRITICAL 9.8
  • TI-2023-04799 Out-of-bounds write in Google Chrome KEVCVSS 3.1HIGH 8.8
  • TI-2023-04477 Out-of-bounds write in Google Chrome KEVCVSS 3.1HIGH 8.8
See all 3444 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences