Vulnerability Database

310,057

Total vulnerabilities in the database

CVE-2020-26978

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.

  • Published: Jan 7, 2021
  • Updated: Nov 16, 2025
  • CVE: CVE-2020-26978
  • Severity: Medium
  • Exploit:

CVSS v3:

  • Severity: Medium
  • Score: 6.1
  • AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS v2:

  • Severity: Medium
  • Score: 5.8
  • AV:N/AC:M/Au:N/C:P/I:P/A:N

No CWE or OWASP classifications available.

Software From Fixed in
mozilla / firefox_esr - 78.6.0
mozilla / thunderbird - 78.6.0
mozilla / firefox - 84.0