Firefox before 159.0.1 affected by vulnerability fixed in 159.0.1
Original title: Mozilla security advisory (AV26-1131)
Canada's Cyber Centre urges users to review Mozilla's links and apply updates as they become available.
Canadian Centre for Cyber Security advisory AV26-1131, dated November 6, 2026, says Firefox before 159.0.1 is affected by a vulnerability. Mozilla fixed the issues in Firefox 159.0.1. The notice does not name a CVE or describe the impact, and it points readers to Mozilla Foundation security advisories.
Unconfirmed: The notice does not describe the vulnerability or its impact.
- The advisory serial number is AV26-1131, dated November 6, 2026.
- Mozilla lists the issues as fixed in Firefox 159.0.1.
- The notice says Firefox was affected as of November 3, 2026.
| Product | Affected | Fixed in |
|---|---|---|
| Mozilla Firefox | Prior to 159.0.1 | 159.0.1 |
- 1.Review the Mozilla Foundation advisory linked by the Cyber Centre.
- 2.Apply Firefox 159.0.1 or later when available.
- Vendors
- Mozilla
- Products
- Firefox
- Organizations
- Canadian Centre for Cyber Security
- Countries
- Canada
From the original article
1 min read at cyber.gc.ca
Serial number: AV26-1131 Date: November 6, 2026 As of November 3, 2026, Mozilla is affected by a vulnerability in the following product: Firefox Prior to 159. 0. 1 The Cyber Centre encourages users and administrators to review the provided web links and apply any necessary updates as they become available.
cyber.gc.ca
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