CVE-2020-26978

MEDIUM

Firefox <84, Thunderbird <78.6, Firefox ESR <78.6 - Info Disclosure

Title source: llm
STIX 2.1

Description

Using techniques that built on the slipstream research, a malicious webpage could have exposed both an internal network's hosts as well as services running on the user's local machine. This vulnerability affects Firefox < 84, Thunderbird < 78.6, and Firefox ESR < 78.6.

References (4)

Core 4
Core References
Permissions Required x_refsource_misc
https://bugzilla.mozilla.org/show_bug.cgi?id=1677047

Scores

CVSS v3 6.1
EPSS 0.0042
EPSS Percentile 62.2%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Details

Status published
Products (3)
mozilla/firefox < 84.0
mozilla/firefox_esr < 78.6.0
mozilla/thunderbird < 78.6.0
Published Jan 07, 2021
Tracked Since Feb 18, 2026