https://cve.radiocsirt.org/rss/recent/all/10 Most recent entries from all 2026-10-09T20:27:05.688648+00:00 Vulnerability-Lookup csirt@opendfir.org python-feedgen Contains only the most 10 recent entries. https://cve.radiocsirt.org/vuln/euvd-2026-319256 EUVD-2026-319256 2026-10-09T20:27:05.737814+00:00 EUVD-2026-319256 https://cve.radiocsirt.org/vuln/fkie_cve-2026-28759 fkie_cve-2026-28759 2026-10-09T20:27:05.737855+00:00

Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 fail to validate that a remote cluster has access to a channel before processing membership removal requests during shared channel membership sync, which allows a malicious remote cluster to remove any user from any channel, including private channels, via crafted membership sync messages targeting channels the remote cluster is not authorized to access. Mattermost Advisory ID: MMSA-2026-00576

 https://cve.radiocsirt.org/vuln/ghsa-8h9w-w78c-vvr3 GHSA-8h9w-w78c-vvr3 — Mattermost does not verify remote cluster channel access when processing shared channel membership removals 2026-10-09T20:27:05.737892+00:00

Affected: Go: github.com/mattermost/mattermost/server/v8, Go: github.com/mattermost/mattermost-server

Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 fail to validate that a remote cluster has access to a channel before processing membership removal requests during shared channel membership sync, which allows a malicious remote cluster to remove any user from any channel, including private channels, via crafted membership sync messages targeting channels the remote cluster is not authorized to access. Mattermost Advisory ID: MMSA-2026-00576.