Mattermost 11.10.0 and three older lines have an unspecified flaw
Original title: Mattermost security advisory (AV26-1104)
Canada's Cyber Centre urges administrators to review Mattermost security updates and apply fixes when they are available.
On October 29, 2026, the Canadian Centre for Cyber Security issued advisory AV26-1104. As of October 28, Mattermost builds at or below 11.10.0, 11.9.2, 11.8.6, and 11.7.11 are affected. The notice does not name a CVE, describe impact, or list fixed versions, and points readers to Mattermost's security updates.
Unconfirmed: The notice does not identify the flaw, its impact, or whether fixes are already available.
- The advisory serial number is AV26-1104, dated October 29, 2026.
- No CVE identifier or attacker impact is stated.
- Fixed builds are not listed in the notice.
| Product | Affected |
|---|---|
| Mattermost | prior to or equal to 11.10.0, 11.9.2, 11.8.6, and 11.7.11 |
- 1.Review Mattermost security updates and apply fixes as they become available.
- Vendors
- Mattermost
- Organizations
- Canadian Centre for Cyber Security
From the original article
1 min read at cyber.gc.ca
Serial number: AV26-1104 Date: October 29, 2026 As of October 28, 2026, Mattermost is affected by a vulnerability in the following product: Mattermost Prior to or equal to 11. 10. 0 Prior to or equal to 11.
cyber.gc.ca
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