Vulnerability · 1 source · latest 2h

Canadian Cyber Centre advises updating Firefox to version 159.0.1 or later

VULNERABILITYFirefoxredteam/daily · 1 source

Severity: Medium
Sources: 1

What happened

Canadian Cyber Centre advisory AV26-1131, dated 6 November 2026, states that as of 3 November 2026 Firefox prior to 159.0.1 is affected by a vulnerability. The advisory cites Mozilla Foundation Security Advisories for the fixes in Firefox 159.0.1 but gives no CVE identifiers or technical details. Defenders should confirm Firefox is at 159.0.1 or later across managed endpoints and review the linked Mozilla advisories.

For security analysts · Written by AI from 1 source · Wrong?

What to do

Update Firefox to version 159.0.1 or later.
Review the Mozilla security advisories for Firefox 159.0.1 for details of the fixed vulnerabilities.
Administrators should check that managed Firefox installations have been updated.

Written by AI from the sources, checked against them

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