Medium severity6.1NVD Advisory· Published Jan 7, 2021· Updated Jun 17, 2026
CVE-2020-26978
CVE-2020-26978
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
38unspecified+ 4 more
- (no CPE)range: unspecified
- (no CPE)range: unspecified
- cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*range: <84.0
- cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*range: <78.6.0
- (no CPE)range: <84
unspecified+ 2 more
- (no CPE)range: unspecified
- cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*range: <78.6.0
- (no CPE)range: <78.6
- osv-coords30 versionspkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP2-LTSSpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP4-LTSSpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Enterprise%20Storage%205pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Desktop%20Applications%2015%20SP2pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Desktop%20Applications%2015%20SP1pkg:rpm/suse/MozillaFirefox&distro=HPE%20Helion%20OpenStack%208pkg:rpm/suse/MozillaFirefox&distro=SUSE%20OpenStack%20Cloud%207pkg:rpm/suse/MozillaFirefox&distro=SUSE%20OpenStack%20Cloud%208pkg:rpm/suse/MozillaFirefox&distro=SUSE%20OpenStack%20Cloud%209pkg:rpm/suse/MozillaFirefox&distro=SUSE%20OpenStack%20Cloud%20Crowbar%208pkg:rpm/suse/MozillaFirefox&distro=SUSE%20OpenStack%20Cloud%20Crowbar%209pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP2pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP3pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP4pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP2-BCLpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP3-LTSSpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP3-BCLpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP5pkg:rpm/suse/MozillaThunderbird&distro=SUSE%20Linux%20Enterprise%20Workstation%20Extension%2015%20SP2pkg:rpm/suse/MozillaThunderbird&distro=SUSE%20Linux%20Enterprise%20Workstation%20Extension%2015%20SP1pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP4-LTSSpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Software%20Development%20Kit%2012%20SP5pkg:rpm/opensuse/firefox-esr&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/MozillaThunderbird&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/MozillaFirefox&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/MozillaThunderbird&distro=openSUSE%20Leap%2015.2pkg:rpm/opensuse/MozillaFirefox&distro=openSUSE%20Leap%2015.2pkg:rpm/opensuse/MozillaFirefox&distro=openSUSE%20Leap%2015.1pkg:rpm/opensuse/MozillaThunderbird&distro=openSUSE%20Leap%2015.1
< 78.6.0-112.39.1+ 29 more
- (no CPE)range: < 78.6.0-112.39.1
- (no CPE)range: < 78.6.0-112.39.1
- (no CPE)range: < 78.6.0-112.39.1
- (no CPE)range: < 78.6.0-112.39.1
- (no CPE)range: < 78.6.0-8.20.2
- (no CPE)range: < 78.6.0-3.122.1
- (no CPE)range: < 78.6.0-112.39.1
- (no CPE)range: < 78.6.0-112.39.1
- (no CPE)range: < 78.6.0-112.39.1
- (no CPE)range: < 78.6.0-112.39.1
- (no CPE)range: < 78.6.0-112.39.1
- (no CPE)range: < 78.6.0-112.39.1
- (no CPE)range: < 78.6.0-112.39.1
- (no CPE)range: < 78.6.0-112.39.1
- (no CPE)range: < 78.6.0-112.39.1
- (no CPE)range: < 78.6.0-112.39.1
- (no CPE)range: < 78.6.0-112.39.1
- (no CPE)range: < 78.6.0-112.39.1
- (no CPE)range: < 78.6.0-112.39.1
- (no CPE)range: < 78.6.0-8.3.1
- (no CPE)range: < 78.6.0-3.113.1
- (no CPE)range: < 78.6.0-78.108.1
- (no CPE)range: < 78.6.0-112.39.1
- (no CPE)range: < 128.5.1-1.1
- (no CPE)range: < 91.1.1-1.1
- (no CPE)range: < 92.0-1.2
- (no CPE)range: < 78.6.0-lp152.2.23.1
- (no CPE)range: < 78.6.0-lp152.2.34.1
- (no CPE)range: < 78.6.0-lp151.2.82.1
- (no CPE)range: < 78.6.0-lp151.2.63.1
Patches
Vulnerability mechanics
References
4- www.mozilla.org/security/advisories/mfsa2020-54/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2020-55/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2020-56/nvdVendor Advisory
- bugzilla.mozilla.org/show_bug.cginvdPermissions Required
News mentions
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