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TI-2026-00669 Aliases CVE-2026-0890GHSA-484x-228c-ffm5

Authentication bypass by spoofing in Mozilla Firefox

Priority LOW 24CWE-290Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
Low · None · Low
Fix status
Partial Red Hat: 17 fixed, 3 without a fix

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat. Impact type from CWE-290.

Summary

Spoofing issue in the DOM: Copy & Paste and Drag & Drop component. This vulnerability was fixed in Firefox 147, Firefox ESR 140.7, Thunderbird 147, and Thunderbird 140.7.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.003 22nd percentileScored 2026-11-07
Fix Partial Firefox (Mozilla): 140.7, 147Thunderbird (Mozilla): 140.7, 147Red Hat: 23 advisoriesRed Hat: 17 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—140.7, 147Patch availableCNA
MozillaThunderbird—140.7, 147Patch availableCNA
  • Firefox VendorMozilla Affected — Fixed in 140.7, 147 Patch available CNA
  • Thunderbird VendorMozilla Affected — Fixed in 140.7, 147 Patch available CNA

CPE configurations NVD · 4

CPEVersionsRoleVendor
cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*before 140.7.0VulnerableMozilla
cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*before 147.0VulnerableMozilla
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*before 140.7.0VulnerableMozilla
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*before 147.0VulnerableMozilla
  • cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:* Versions before 140.7.0 Vulnerable ·Mozilla
  • cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:* Versions before 147.0 Vulnerable ·Mozilla
  • cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:* Versions before 140.7.0 Vulnerable ·Mozilla
  • cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:* Versions before 147.0 Vulnerable ·Mozilla

Remediation

  • Fix · CNA Firefox (Mozilla) Fixed in 140.7, 147
  • Fix · CNA Thunderbird (Mozilla) Fixed in 140.7, 147

Red Hat 23 advisories

  • RHSA-2026:2286 Released 2026-02-09 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream (v. 10) thunderbird-140.7.0-1.el10_1
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) thunderbird-140.7.0-1.el10_0
  • RHSA-2026:2271 Released 2026-02-09 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream (v. 10) firefox-140.7.0-1.el10_1
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) firefox-140.7.0-1.el10_0
  • RHSA-2026:2220 Released 2026-02-09 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream (v. 8) thunderbird-140.7.0-1.el8_10
Show 20 more Red Hat advisories
  • RHSA-2026:2231 Released 2026-02-09 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux Server (v. 7 ELS) firefox-140.7.0-1.el7_9
  • RHSA-2026:2074 Released 2026-02-05 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream AUS (v. 8.2) firefox-140.7.0-1.el8_2
  • RHSA-2026:2073 Released 2026-02-05 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.4) firefox-140.7.0-1.el8_4
    • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) firefox-140.7.0-1.el8_4
  • RHSA-2026:2070 Released 2026-02-05 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.6) firefox-140.7.0-1.el8_6
    • Red Hat Enterprise Linux AppStream E4S (v.8.6) firefox-140.7.0-1.el8_6
    • Red Hat Enterprise Linux AppStream TUS (v.8.6) firefox-140.7.0-1.el8_6
  • RHSA-2026:2069 Released 2026-02-05 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream E4S (v.8.8) firefox-140.7.0-1.el8_8
    • Red Hat Enterprise Linux AppStream TUS (v.8.8) firefox-140.7.0-1.el8_8
  • RHSA-2026:2043 Released 2026-02-05 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) firefox-140.7.0-1.el9_6, firefox-x11-140.7.0-1.el9_6
  • RHSA-2026:2047 Released 2026-02-05 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.0) firefox-140.7.0-1.el9_0
  • RHSA-2026:2044 Released 2026-02-05 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) firefox-140.7.0-1.el9_2, firefox-x11-140.7.0-1.el9_2
  • RHSA-2026:2041 Released 2026-02-05 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream EUS (v.9.4) firefox-140.7.0-1.el9_4, firefox-x11-140.7.0-1.el9_4
  • RHSA-2026:1487 Released 2026-01-28 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.6) thunderbird-140.7.0-1.el8_6
    • Red Hat Enterprise Linux AppStream E4S (v.8.6) thunderbird-140.7.0-1.el8_6
    • Red Hat Enterprise Linux AppStream TUS (v.8.6) thunderbird-140.7.0-1.el8_6
  • RHSA-2026:1471 Released 2026-01-28 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream AUS (v. 8.2) thunderbird-140.7.0-1.el8_2
  • RHSA-2026:1462 Released 2026-01-28 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream E4S (v.8.8) thunderbird-140.7.0-1.el8_8
    • Red Hat Enterprise Linux AppStream TUS (v.8.8) thunderbird-140.7.0-1.el8_8
  • RHSA-2026:1461 Released 2026-01-28 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.4) thunderbird-140.7.0-1.el8_4
    • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) thunderbird-140.7.0-1.el8_4
  • RHSA-2026:1414 Released 2026-01-27 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream EUS (v.9.4) thunderbird-140.7.0-1.el9_4
  • RHSA-2026:1415 Released 2026-01-27 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) thunderbird-140.7.0-1.el9_2
  • RHSA-2026:1413 Released 2026-01-27 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.0) thunderbird-140.7.0-1.el9_0
  • RHSA-2026:1320 Released 2026-01-27 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) thunderbird-140.7.0-2.el9_6
  • RHSA-2026:0924 Released 2026-01-21 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream (v. 9) thunderbird-140.7.0-1.el9_7
  • RHSA-2026:0694 Released 2026-01-15 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream (v. 9) firefox-140.7.0-1.el9_7, firefox-x11-140.7.0-1.el9_7
  • RHSA-2026:0667 Released 2026-01-15 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream (v. 8) firefox-140.7.0-1.el8_10

Vendor assessments

Red Hat

Red Hat rating: Low. 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-2026:2271, RHSA-2026:2286
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2026:0667, RHSA-2026:2220
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:0694, RHSA-2026:0924
Red Hat Enterprise Linux AppStream AUS (v. 8.2)Fixed RHSA-2026:1471, RHSA-2026:2074
Red Hat Enterprise Linux AppStream AUS (v.8.4)Fixed RHSA-2026:1461, RHSA-2026:2073
Red Hat Enterprise Linux AppStream AUS (v.8.6)Fixed RHSA-2026:1487, RHSA-2026:2070
Red Hat Enterprise Linux AppStream E4S (v.8.6)Fixed RHSA-2026:1487, RHSA-2026:2070
Red Hat Enterprise Linux AppStream E4S (v.8.8)Fixed RHSA-2026:1462, RHSA-2026:2069
Red Hat Enterprise Linux AppStream E4S (v.9.0)Fixed RHSA-2026:1413, RHSA-2026:2047
Red Hat Enterprise Linux AppStream E4S (v.9.2)Fixed RHSA-2026:1415, RHSA-2026:2044
Red Hat Enterprise Linux AppStream EUS (v. 10.0)Fixed RHSA-2026:2271, RHSA-2026:2286
Red Hat Enterprise Linux AppStream EUS (v.9.4)Fixed RHSA-2026:1414, RHSA-2026:2041
Red Hat Enterprise Linux AppStream EUS (v.9.6)Fixed RHSA-2026:1320, RHSA-2026:2043
Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4)Fixed RHSA-2026:1461, RHSA-2026:2073
Red Hat Enterprise Linux AppStream TUS (v.8.6)Fixed RHSA-2026:1487, RHSA-2026:2070
Red Hat Enterprise Linux AppStream TUS (v.8.8)Fixed RHSA-2026:1462, RHSA-2026:2069
Red Hat Enterprise Linux Server (v. 7 ELS)Fixed RHSA-2026:2231

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-0890
  2. 2026-10-03 Alias added: GHSA-484x-228c-ffm5

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