Read the docs
TI-2020-05508 Aliases CVE-2020-6798GHSA-qwm2-p76q-cw3g

Cross-site scripting in Mozilla Thunderbird

Priority LOW 31CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
Low · Low · None
Fix status
Partial Red Hat: 15 fixed, 1 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-79.

Summary

If a template tag was used in a select tag, the parser could be confused and allow JavaScript parsing and execution when it should not be allowed. A site that relied on the browser behaving correctly could suffer a cross-site scripting vulnerability as a result. In general, this flaw cannot be exploited through email in the Thunderbird product because scripting is disabled when reading mail, but is potentially a risk in browser or browser-like contexts. This vulnerability affects Thunderbird < 68.5, Firefox < 73, and Firefox < ESR68.5.

Why it matters now

EPSS 0.02046 81st percentileScored 2026-11-07
Fix Partial Thunderbird (Mozilla): 68.5Firefox (Mozilla): 73, ESR68.5Red Hat: 8 advisoriesRed Hat: 15 fixed, 1 without a fix

SSVC decision points

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

Affected products

VendorProductAffected versionsFixed inStatusSource
MozillaThunderbirdbefore 68.568.5Patch availableCNA
MozillaFirefoxbefore 73; before ESR68.573, ESR68.5Patch availableCNA
  • Thunderbird VendorMozilla Affected before 68.5 Fixed in 68.5 Patch available CNA
  • Firefox VendorMozilla Affected before 73; before ESR68.5 Fixed in 73, ESR68.5 Patch available CNA

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*before 73.0VulnerableMozilla
cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*before 68.5.0VulnerableMozilla
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*before 68.5.0VulnerableMozilla
  • cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* Versions before 73.0 Vulnerable ·Mozilla
  • cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:* Versions before 68.5.0 Vulnerable ·Mozilla
  • cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* Versions before 68.5.0 Vulnerable ·Mozilla

Remediation

  • Fix · CNA Thunderbird (Mozilla) Fixed in 68.5
  • Fix · CNA Firefox (Mozilla) Fixed in 73, ESR68.5

Red Hat 8 advisories

  • RHSA-2020:0576 Released 2020-02-24 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux Client (v. 7) thunderbird-68.5.0-1.el7_7
    • Red Hat Enterprise Linux Server Optional (v. 7) thunderbird-68.5.0-1.el7_7
    • Red Hat Enterprise Linux Workstation (v. 7) thunderbird-68.5.0-1.el7_7
  • RHSA-2020:0574 Released 2020-02-24 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux Desktop (v. 6) thunderbird-68.5.0-1.el6_10
    • Red Hat Enterprise Linux Server Optional (v. 6) thunderbird-68.5.0-1.el6_10
    • Red Hat Enterprise Linux Workstation (v. 6) thunderbird-68.5.0-1.el6_10
  • RHSA-2020:0577 Released 2020-02-24 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream (v. 8) thunderbird-68.5.0-1.el8_1
Show 5 more Red Hat advisories
  • RHSA-2020:0565 Released 2020-02-20 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream E4S (v. 8.0) thunderbird-68.5.0-1.el8_0
  • RHSA-2020:0519 Released 2020-02-18 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream E4S (v. 8.0) firefox-68.5.0-2.el8_0
  • RHSA-2020:0520 Released 2020-02-18 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux Client (v. 7) firefox-68.5.0-2.el7_7
    • Red Hat Enterprise Linux Client Optional (v. 7) firefox-68.5.0-2.el7_7
    • Red Hat Enterprise Linux Server (v. 7) firefox-68.5.0-2.el7_7
    • Red Hat Enterprise Linux Server Optional (v. 7) firefox-68.5.0-2.el7_7
    • Red Hat Enterprise Linux Workstation (v. 7) firefox-68.5.0-2.el7_7
    • Red Hat Enterprise Linux Workstation Optional (v. 7) firefox-68.5.0-2.el7_7
  • RHSA-2020:0521 Released 2020-02-18 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux Desktop (v. 6) firefox-68.5.0-2.el6_10
    • Red Hat Enterprise Linux Desktop Optional (v. 6) firefox-68.5.0-2.el6_10
    • Red Hat Enterprise Linux HPC Node Optional (v. 6) firefox-68.5.0-2.el6_10
    • Red Hat Enterprise Linux Server (v. 6) firefox-68.5.0-2.el6_10
    • Red Hat Enterprise Linux Server Optional (v. 6) firefox-68.5.0-2.el6_10
    • Red Hat Enterprise Linux Workstation (v. 6) firefox-68.5.0-2.el6_10
    • Red Hat Enterprise Linux Workstation Optional (v. 6) firefox-68.5.0-2.el6_10
  • RHSA-2020:0512 Released 2020-02-17 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream (v. 8) firefox-68.5.0-2.el8_1

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Advisory ·

    Mozilla Firefox, Thunderbird — USN-4278-2

    4 records Highest priority Priority MEDIUM 3 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2020-05510 Out-of-bounds write in Mozilla ThunderbirdPriority MEDIUM 42
    • TI-2020-05511 Out-of-bounds write in Mozilla FirefoxPriority MEDIUM 41
    • TI-2020-05506 Out-of-bounds write in Mozilla FirefoxPriority MEDIUM 41
    Show all 4 records → Advisory →

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Enterprise Linux 5AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2020:0512, RHSA-2020:0577
Red Hat Enterprise Linux AppStream E4S (v. 8.0)Fixed RHSA-2020:0519, RHSA-2020:0565
Red Hat Enterprise Linux Client (v. 7)Fixed RHSA-2020:0520, RHSA-2020:0576
Red Hat Enterprise Linux Client Optional (v. 7)Fixed RHSA-2020:0520
Red Hat Enterprise Linux Desktop (v. 6)Fixed RHSA-2020:0521, RHSA-2020:0574
Red Hat Enterprise Linux Desktop Optional (v. 6)Fixed RHSA-2020:0521
Red Hat Enterprise Linux HPC Node Optional (v. 6)Fixed RHSA-2020:0521
Red Hat Enterprise Linux Server (v. 6)Fixed RHSA-2020:0521
Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2020:0520
Red Hat Enterprise Linux Server Optional (v. 6)Fixed RHSA-2020:0521, RHSA-2020:0574
Red Hat Enterprise Linux Server Optional (v. 7)Fixed RHSA-2020:0520, RHSA-2020:0576
Red Hat Enterprise Linux Workstation (v. 6)Fixed RHSA-2020:0521, RHSA-2020:0574
Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2020:0520, RHSA-2020:0576
Red Hat Enterprise Linux Workstation Optional (v. 6)Fixed RHSA-2020:0521
Red Hat Enterprise Linux Workstation Optional (v. 7)Fixed RHSA-2020:0520

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-6798
  2. 2026-10-03 Alias added: GHSA-qwm2-p76q-cw3g

References

Advisory 8

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