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CVE-2020-26978 Using techniques that built on the slipstream research, a malicious webpage could have exposed both an internal…

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.

Affected products and versions

Product Affected versions Fixed in
Firefox 84 earliest → < 84 84
Thunderbird 78.6 earliest → < 78.6 78.6
Firefox ESR 78.6 earliest → < 78.6 78.6

Other CVEs of Firefox

The 2221 CVEs of Firefox →
CVE-2026-120572 Incorrect boundary conditions in the Layout: Block and Inline component 8.8 High CVE-2026-118027 Frame poisoning in the Layout component 9.1 Critical CVE-2026-118025 Other issue in the SVG component 8.8 High CVE-2026-118024 Use-after-free in the Graphics: Text component 8.8 High
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