Mattermost is a secure collaboration platform built for organizations that need to keep their most critical information safe.https://mattermost.com/en-ushttps://mattermost.com/blog/mattermost-v12-and-arqit-quantum-safe-collaboration-at-the-deployed-edge/https://mattermost.com/blog/mattermost-v12-and-arqit-quantum-safe-collaboration-at-the-deployed-edge/Mattermost v12 and the Arqit SKP-Platform pair device-level quantum-safe trust with application-level access control for sovereign, air-gapped defence operations.Mon, 09 Nov 2026 12:00:00 GMTPlatformCharlotte Brownhttps://mattermost.com/blog/your-mfa-isnt-phishing-resistant-heres-what-is/https://mattermost.com/blog/your-mfa-isnt-phishing-resistant-heres-what-is/Federal policy now requires phishing-resistant MFA, and OTP and TOTP do not qualify. Compare CAC/PIV, FIDO2 tokens and passkeys for defense and air-gapped environments.Mon, 09 Nov 2026 12:00:00 GMTPlatformKeith Caseyhttps://mattermost.com/blog/every-user-every-device-every-channel/https://mattermost.com/blog/every-user-every-device-every-channel/Mattermost v12 gives access policy new attributes to evaluate and new places to attach them, so controls can describe the situation, not just the user.Wed, 04 Nov 2026 12:00:00 GMTReleasesKeith Caseyhttps://mattermost.com/blog/your-most-sensitive-information-shouldnt-travel-by-hand/https://mattermost.com/blog/your-most-sensitive-information-shouldnt-travel-by-hand/When the most valuable information also has the tightest handling rules, teams resort to print-and-walk transfers. Mattermost v12 Cross Guard gives collaboration a managed path across accredited cross-domain boundaries.Mon, 26 Oct 2026 12:00:00 GMTReleasesKeith Caseyhttps://mattermost.com/blog/agents-are-doing-the-work-now-control-what-they-can-see/https://mattermost.com/blog/agents-are-doing-the-work-now-control-what-they-can-see/Agents belong in mission workflows—but a shared service account can turn a fast summary into a data spillage event. Mattermost v12 puts user-scoped access, private models, and auditability in front of every agent action.Fri, 23 Oct 2026 12:00:00 GMTReleasesKeith Caseyhttps://mattermost.com/blog/where-the-response-team-talks-after-the-gateway-falls/https://mattermost.com/blog/where-the-response-team-talks-after-the-gateway-falls/Attackers were inside Citrix NetScaler gateways for weeks before the flaws were confirmed. The channel a response team trusts has to be chosen before the next zero-day.Wed, 14 Oct 2026 06:00:00 GMTCollaborationsecurityAJ Nashhttps://mattermost.com/blog/our-newest-top-contributor-is-an-ai-agent/https://mattermost.com/blog/our-newest-top-contributor-is-an-ai-agent/Matty Code is now a top-three contributor to the Mattermost repository. Here is what worked, what failed, and where the agent goes next.Tue, 06 Oct 2026 06:00:00 GMTEngineeringaiopen-sourceNick Misasihttps://mattermost.com/blog/the-conversation-is-the-operation/https://mattermost.com/blog/the-conversation-is-the-operation/Adversaries treat enterprise collaboration channels as collection targets. Defend that infrastructure the way the intelligence community defends a secure circuit.Tue, 06 Oct 2026 06:00:00 GMTCollaborationsecuritygovernmentAJ Nashhttps://mattermost.com/blog/two-outages-one-vendor-one-lesson/https://mattermost.com/blog/two-outages-one-vendor-one-lesson/Two unrelated failures at one cloud vendor took down email, chat, and admin tools weeks apart. The lesson is shared dependency, not either incident on its own.Tue, 06 Oct 2026 06:00:00 GMTCollaborationsecurityAJ Nashhttps://mattermost.com/blog/operational-resilience-building-trust-from-devices-to-decisions/https://mattermost.com/blog/operational-resilience-building-trust-from-devices-to-decisions/Explore how trusted devices, secure connections and governed workflows help organisations maintain operational resilience from daily operations through disruption.Sat, 26 Sep 2026 10:00:00 GMTuncategorizedJames Mullins (Mattermost) & Seán Carnew (Arqit)https://mattermost.com/blog/zero-trust-in-practice-identity-part-3-the-roadmap-to-optimal/https://mattermost.com/blog/zero-trust-in-practice-identity-part-3-the-roadmap-to-optimal/This is the third part in the Identity series. Part 1 covered Foundation-stage controls: federated identity, MFA, directory sync, and audit logging. Part 2 covered Advanced identity: ABAC, dynamic policy evaluation, and continuous access enThu, 17 Sep 2026 06:16:12 GMTPlatformJustin Reynoldshttps://mattermost.com/blog/mattermost-v11-11-is-now-available/https://mattermost.com/blog/mattermost-v11-11-is-now-available/Mattermost v11.11 gives content reviewers a fast, transparent way to understand who may have seen a flagged post with the new post exposure radius report feature. The team is heads-down on Mattermost v12.0, shipping in October 2026 with a lWed, 16 Sep 2026 06:00:00 GMTPlatformMattermosthttps://mattermost.com/blog/operational-resilience-why-it-must-be-a-daily-practice/https://mattermost.com/blog/operational-resilience-why-it-must-be-a-daily-practice/Operational resilience is often discussed at the point where disruption has already begun. A system has gone down. Communications are unavailable. An incident response team has been activated. Leaders need answers quickly, while regulators,Tue, 15 Sep 2026 10:01:44 GMTuncategorizedSteve Berichonhttps://mattermost.com/blog/zero-trust-in-practice-identity-part-2-advanced-identity-from-static-roles-to-dynamic-access/https://mattermost.com/blog/zero-trust-in-practice-identity-part-2-advanced-identity-from-static-roles-to-dynamic-access/This is the second part in an ongoing series on Zero Trust maturity for the Identity pillar. Part 1 covered the Foundation stage: federated identity, MFA, directory sync, and audit logging. This post covers the Advanced maturity stage. The Thu, 10 Sep 2026 06:19:59 GMTPlatformJustin Reynoldshttps://mattermost.com/blog/ai-audit-trails-the-missing-piece-of-enterprise-ai-adoption/https://mattermost.com/blog/ai-audit-trails-the-missing-piece-of-enterprise-ai-adoption/Key Takeaways AI is no longer a pilot project sitting off to the side of enterprise workflows. It drafts responses, triages tickets, and increasingly takes actions inside operational systems. As AI moves closer to real decisions, regulatorTue, 08 Sep 2026 07:52:43 GMTPlatformJustin Reynoldshttps://mattermost.com/blog/zero-trust-in-practice-identity-part-1-building-the-identity-foundation/https://mattermost.com/blog/zero-trust-in-practice-identity-part-1-building-the-identity-foundation/Why “never trust, always verify” starts with your collaboration platform This is the first part in a three-part series on moving from Foundation to Advanced Zero Trust for the identity pillar. Each post maps to a maturity stage in the CISA Tue, 01 Sep 2026 06:00:00 GMTPlatformJustin Reynoldshttps://mattermost.com/blog/what-will-be-deprecated-in-mattermost-v12-0-october-2026/https://mattermost.com/blog/what-will-be-deprecated-in-mattermost-v12-0-october-2026/Mattermost v12.0 will ship in October 2026 with several deprecations, plus a handful of smaller breaking changes, that self-hosted admins, integration authors, and plugin developers should plan for. RHEL 7 and RHEL 8 will no longer be suppoThu, 27 Aug 2026 06:00:00 GMTPlatformAmy Blaishttps://mattermost.com/blog/sovereign-ai-vs-public-ai-choosing-the-right-architecture-for-regulated-organizations/https://mattermost.com/blog/sovereign-ai-vs-public-ai-choosing-the-right-architecture-for-regulated-organizations/Key Takeaways AI adoption is now a baseline requirement for defense, government, and critical infrastructure organizations. The deployment model behind that adoption determines whether an organization controls its own data or hands that conMon, 24 Aug 2026 08:34:11 GMTPlatformJustin Reynoldshttps://mattermost.com/blog/can-agentic-ai-work-in-air-gapped-environments/https://mattermost.com/blog/can-agentic-ai-work-in-air-gapped-environments/Key Takeaways Agentic AI conversations tend to assume a live internet connection. The AI model calls a cloud API for every response, the agent pulls from a hosted vector database, and the model itself receives patches and version updates auTue, 18 Aug 2026 05:49:15 GMTCollaborationJustin Reynoldshttps://mattermost.com/blog/mattermost-v11-10-is-now-available/https://mattermost.com/blog/mattermost-v11-10-is-now-available/Mattermost v11.10 gives security admins tighter, faster control over who accesses what. ABAC governance now reaches team-level membership and native user attributes let admins write policies without any extra integration work. AI agents getFri, 14 Aug 2026 06:00:00 GMTPlatformMattermost