Mozilla security advisory (AV26-868)
Canada's Cyber Centre reports Mozilla vulnerabilities fixed in Firefox 155 and Firefox ESR 115.40, 140.15, and 153.2.
Canadian Centre for Cyber Security advisory AV26-868, dated September 1, 2026, notes vulnerabilities in Firefox (versions prior to 155) and Firefox ESR (prior to 115.40, 140.15, and 153.2). The bulletin links to Mozilla's security advisories and urges users and administrators to update. No CVE identifiers or exploitation details are provided.
- Firefox ESR branches 115, 140, and 153 plus Firefox 155 receive security fixes
- Advisory AV26-868 provides no CVE IDs or exploitation details
- Users and administrators urged to update browsers promptly
- Vendors
- Mozilla
- Products
- FirefoxFirefox ESR
- Organizations
- Canadian Centre for Cyber Security
- Countries
- Canada
From the original article
1 min read at cyber.gc.ca
Serial number: AV26-868 Date: September 1, 2026 As of September 1, 2026, Mozilla is affected by vulnerabilities in the following products: Firefox ESR Versions prior to 115. 40 Versions prior to 140. 15 Versions prior to 153.
cyber.gc.ca
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