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TI-2026-00666 Aliases CVE-2026-0887GHSA-96f5-9x27-7hhh

Clickjacking issue, information disclosure in the PDF Viewer component

Priority LOW 20CWE-497Published · 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: 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-497.

Summary

Clickjacking issue, information disclosure in the PDF Viewer 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 0.00326 25th 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: 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-2026:2271, 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-2026-0887
  2. 2026-10-03 Alias added: GHSA-96f5-9x27-7hhh

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