CVE-2018-12392

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-13. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 3%CVSS: 9.8Exploit: None knownExposed: 0

A fix is available — apply it.

When manipulating user events in nested loops while opening a document through script, it is possible to trigger a potentially exploitable crash due to poor event handling. This vulnerability affects Firefox < 63, Firefox ESR < 60.3, and Thunderbird < 60.3.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
50(Track)
EG Risk 50/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation3% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
3%
EPSS %ILE
88%
KEV
Not listed

Published

February 28, 2019

Last Modified

November 25, 2025

Advisory Details (10)

Auto-updated Aug 20, 2026
Patch available. Sources: redhat.
generic Patch Available

[SECURITY] [DLA 1575-1] thunderbird security update

https://lists.debian.org/debian-lts-announce/2018/11/msg00011.html
generic Patch Available

[SECURITY] [DLA 1571-1] firefox-esr security update

https://lists.debian.org/debian-lts-announce/2018/11/msg00008.html
generic

1492823 - (CVE-2018-12392) js::AssertSameCompartment failure in nsHTMLDocument::Open

https://bugzilla.mozilla.org/show_bug.cgi?id=1492823
redhat Patch Available

Affected: Red Hat Enterprise Linux 7.

https://access.redhat.com/errata/RHSA-2018:3532
redhat Patch Available

Affected: Red Hat Enterprise Linux 6.

https://access.redhat.com/errata/RHSA-2018:3531
redhat Patch Available

Affected: Red Hat Enterprise Linux 6.

https://access.redhat.com/errata/RHSA-2018:3006
redhat Patch Available

Affected: Red Hat Enterprise Linux 7.

https://access.redhat.com/errata/RHSA-2018:3005
generic
http://www.securitytracker.com/id/1041944
generic

CVE-2018-12389 - PSIRT.COM

http://www.securityfocus.com/bid/105769
generic

CVE-2018-12390 - PSIRT.COM

http://www.securityfocus.com/bid/105718

Vendor Advisories for CVE-2018-12392(4)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(6)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntufirefox-testsuite (63.0+build2-0ubuntu0.16.04.2) @ xenial2026-05-27ubuntu
ubuntuxul-ext-lightning (1:60.4.0+build2-0ubuntu0.16.04.1) @ xenial2026-05-27ubuntu
redhatthunderbird-0:60.3.0-1.el62018-11-09redhat
redhatthunderbird-0:60.3.0-1.el7_52018-11-09redhat
redhatfirefox-0:60.3.0-1.el62018-10-24redhat
redhatfirefox-0:60.3.0-1.el7_52018-10-24redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(12 across 6 ecosystems)
Debian:11(2)
PackageVulnerable rangeFixed inDependents
firefox-esr—60.3.0esr-1—
thunderbird—1:60.3.0-1—
Debian:12(2)
PackageVulnerable rangeFixed inDependents
firefox-esr—60.3.0esr-1—
thunderbird—1:60.3.0-1—
Debian:13(2)
PackageVulnerable rangeFixed inDependents
firefox-esr—60.3.0esr-1—
thunderbird—1:60.3.0-1—
Debian:14(2)
PackageVulnerable rangeFixed inDependents
firefox-esr—60.3.0esr-1—
thunderbird—1:60.3.0-1—
Debian:8(2)
PackageVulnerable rangeFixed inDependents
firefox-esr45.0.1esr-1 ... 60.2.2esr-1~deb9u1 (114 versions)60.3.0esr-1~deb8u1—
thunderbird1.5-4 ... 1:60.2.1-2~deb9u1 (58 versions)1:60.3.0-1~deb8u1—
Debian:9(2)
PackageVulnerable rangeFixed inDependents
firefox-esr45.9.0esr-1 ... 60.3.0esr-1~deb8u1 (77 versions)60.3.0esr-1~deb9u1—
thunderbird1.5-4 ... 1:60.3.0-1~deb8u1 (59 versions)1:60.3.0-1~deb9u1—

Additional Vendor Advisories

(2)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 7× in last 7d / 28× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 115 total refreshes for this CVE.

  1. 2026-08-20 22:51 UTCEPSS rescore
  2. 2026-08-19 17:00 UTCEPSS rescore
  3. 2026-08-18 13:43 UTCEPSS rescore
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  15. 2026-08-06 06:24 UTCOSV refresh
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  1. 2026-07-23 14:15 UTCEPSS rescore
  2. 2026-07-23 01:33 UTCEG score recompute
  3. 2026-07-22 22:13 UTCEG score recompute
  4. 2026-07-22 14:04 UTCEPSS rescore
  5. 2026-07-21 15:21 UTCEPSS rescore
  6. 2026-07-20 21:32 UTCOSV refresh
  7. 2026-07-20 17:04 UTCEPSS rescore
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  9. 2026-07-19 14:28 UTCEPSS rescore
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  22. 2026-07-07 13:42 UTCEPSS rescore
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  24. 2026-07-06 16:24 UTCEPSS rescore
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  27. 2026-07-05 02:27 UTCEPSS rescore
  28. 2026-07-04 06:28 UTCEPSS rescore
  29. 2026-07-03 16:56 UTCOSV refresh
  30. 2026-07-02 16:54 UTCEPSS rescore
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  54. 2026-06-15 05:43 UTCOSV refresh
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Frequently asked(5)

What is CVE-2018-12392?
CVE-2018-12392 is a critical vulnerability published on February 28, 2019. When manipulating user events in nested loops while opening a document through script, it is possible to trigger a potentially exploitable crash due to poor event handling. This vulnerability affects Firefox < 63, Firefox ESR < 60.3, and Thunderbird < 60.3.
When was CVE-2018-12392 disclosed?
CVE-2018-12392 was first published in the National Vulnerability Database on February 28, 2019, with the most recent update on November 25, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2018-12392 actively exploited?
CVE-2018-12392 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 3% probability of exploitation in the next 30 days, which ranks it in the top 12.0% of all scored CVEs.
What is the CVSS score of CVE-2018-12392?
CVE-2018-12392 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2018-12392?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-12392, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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