Security readout for executives and security teams
CVE-2019-17026 is a Mozilla Firefox and Thunderbird memory-safety flaw. A malicious webpage or content path could trigger type confusion in the JavaScript engine. Mozilla reported targeted attacks in the wild, and CISA lists it in KEV, so outdated installations are urgent legacy exposure. Exposure is limited to Mozilla Firefox before 72.0.1, Firefox ESR before 68.4.1, and Thunderbird before 68.4.1. The sources do not identify other affected products. Treat as urgent for any environment still running affected Mozilla versions. The practical business risk is endpoint compromise through user interaction with malicious content, with documented in-the-wild targeting. Mitigation focus: Update Firefox to 72.0.1 or later.; Update Firefox ESR to 68.4.1 or later.; Update Thunderbird to 68.4.1 or later..
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
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ATT&CK lookup starting points
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Open ATT&CK lookupCVE-2019-17026 mapping review
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Open ATT&CK lookup- Severity
- High
- CVSS
- 8.8 (3.1)
- Known Exploited
- Yes
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CISA KEV status
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H2.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.8HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://www.mozilla.org/security/advisories/mfsa2020-04/CVE reference · x_refsource_MISC
- https://www.mozilla.org/security/advisories/mfsa2020-03/CVE reference · x_refsource_MISC
- https://bugzilla.mozilla.org/show_bug.cgi?id=1607443CVE reference · x_refsource_MISC
- GLSA-202003-02CVE reference · vendor-advisory, x_refsource_GENTOO
- USN-4335-1CVE reference · vendor-advisory, x_refsource_UBUNTU
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-17026CVE reference · government-resource
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Access of Resource Using Incompatible Type ('Type Confusion')
Access of Resource Using Incompatible Type ('Type Confusion') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.