CVE-2020-12389

CRITICAL 10.0CVE-2020-12389 · Published 26/05/2020 · updated 17/06/2026

In short

CVE-2020-12389 is a CRITICAL (CVSS 10.0) vulnerability affecting firefox (mozilla), firefox esr (mozilla).
Chance of exploitation in the next 30 days (EPSS): 1.7%, higher than 77.5% of all vulnerabilities.
Fix: update to 76.0, 68.8.0 or later.

Package	Affected versions	Patched versions
firefox mozilla	`< 76.0`	`76.0`
firefox esr mozilla	`< 68.8.0`	`68.8.0`

Description

The Firefox content processes did not sufficiently lockdown access control which could result in a sandbox escape. *Note: this issue only affects Firefox on Windows operating systems.*. This vulnerability affects Firefox ESR < 68.8 and Firefox < 76.

References

bugzilla.mozilla.org/show_bug.cgi · Permissions Required
mozilla.org/security/advisories/mfsa2020-16 · Vendor Advisory
mozilla.org/security/advisories/mfsa2020-17 · Vendor Advisory

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Package

Affected versions

Patched versions

firefox

mozilla

< 76.0

76.0

firefox esr

mozilla

< 68.8.0

68.8.0

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