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TI-2018-13092 Aliases CVE-2018-18509GHSA-pqr9-248w-h9pf

Improper signature verification in Mozilla Thunderbird

Priority LOW 27CWE-347Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
None · Low · None
Fix status
Fixed

Attack profile from CVSS 3.0 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-347.

Summary

A flaw during verification of certain S/MIME signatures causes emails to be shown in Thunderbird as having a valid digital signature, even if the shown message contents aren't covered by the signature. The flaw allows an attacker to reuse a valid S/MIME signature to craft an email message with arbitrary content. This vulnerability affects Thunderbird < 60.5.1.

Why it matters now

EPSS 0.01676 77th percentileScored 2026-11-07
Fix Fixed Thunderbird (Mozilla): 60.5.1Red Hat: 3 advisories

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
MozillaThunderbirdbefore 60.5.160.5.1Patch availableCNA
  • Thunderbird VendorMozilla Affected before 60.5.1 Fixed in 60.5.1 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*before 60.5.1VulnerableMozilla
  • cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* Versions before 60.5.1 Vulnerable ·Mozilla

Remediation

  • Fix · CNA Thunderbird (Mozilla) Fixed in 60.5.1

Red Hat 3 advisories

  • RHSA-2019:1144 Released 2019-05-13 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream (v. 8) thunderbird-60.6.1-1.el8
  • RHSA-2019:0681 Released 2019-03-28 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux Client (v. 7) thunderbird-60.6.1-1.el7_6
    • Red Hat Enterprise Linux Server Optional (v. 7) thunderbird-60.6.1-1.el7_6
    • Red Hat Enterprise Linux Workstation (v. 7) thunderbird-60.6.1-1.el7_6
    • Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) thunderbird-60.6.1-1.el7_6
  • RHSA-2019:0680 Released 2019-03-28 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux Desktop (v. 6) thunderbird-60.6.1-1.el6_10
    • Red Hat Enterprise Linux Server Optional (v. 6) thunderbird-60.6.1-1.el6_10
    • Red Hat Enterprise Linux Workstation (v. 6) thunderbird-60.6.1-1.el6_10

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2019:1144
Red Hat Enterprise Linux Client (v. 7)Fixed RHSA-2019:0681
Red Hat Enterprise Linux Desktop (v. 6)Fixed RHSA-2019:0680
Red Hat Enterprise Linux Server Optional (v. 6)Fixed RHSA-2019:0680
Red Hat Enterprise Linux Server Optional (v. 7)Fixed RHSA-2019:0681
Red Hat Enterprise Linux Workstation (v. 6)Fixed RHSA-2019:0680
Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2019:0681
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7)Fixed RHSA-2019:0681

Timeline

  1. 2026-10-02 Threatist record created from CVE-2018-18509
  2. 2026-10-03 Alias added: GHSA-pqr9-248w-h9pf

References

Advisory 7

Other 2

  • 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 2067 →

Sources

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