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CategoryAll Malware 21 Exploit / PoC 16 AI safety & security 16 Threat actor 15 Research 7 Phishing & fraud 7 AI research 5 Advisory 4 Industry 4 Tools 4 AI tools & infra 3 AI industry 2 Data breach 2 Model release 1

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Update your firewall rules: Teams and Copilot are changing address

Microsoft is redirecting Microsoft 365 and Teams web users to new *.cloud.microsoft domains, requiring firewall and proxy rule updates by early October.

Starting September 2026, Microsoft is redirecting M365 web users to copilot.cloud.microsoft and Teams web users to teams.cloud.microsoft, announced via MessageCenter posts MC1465764 and MC1462915. All redirects should complete by early October 2026, with limited Teams exceptions possible until December 31, 2026. Microsoft advises reviewing client, proxy, firewall, and secure web gateway configurations, and suggests using TenantRestrictions to control personal Microsoft account access instead of blocking the new Copilot address.

CSO OnlineSep 11, 17:00 UTC · 5d agoAdvisory1

USN-8571-2: Apache HTTP Server regression

Ubuntu issues USN-8571-2 fixing an Apache HTTP Server regression that prevented startup when HTTP/2 proxying was enabled.

Ubuntu released USN-8571-2 to fix a regression introduced by USN-8571-1 in Apache HTTP Server. The earlier fix was incomplete due to a missing library symbol, causing Apache to fail to start when HTTP/2 proxying was enabled. The original advisory addressed CVE-2026-33007, a memory-handling flaw in mod_authn_socache allowing remote denial of service, and an HTTP response splitting vulnerability affecting multiple modules, credited to Pavel Kohout, Arkadi Vainbrand, Haruki Oyama, Merih Mengisteab, and Dawit Jeong.

Ubuntu Security Noticesupdated Sep 16, 20:12 UTC · 12h agofirst Sep 10, 19:36 UTC · 6d agoAdvisory 14 sources CVE-2026-330071

USN-8563-5: nginx vulnerability

Ubuntu ships improved nginx fix for CVE-2026-42533 after earlier patch regression; flaw allows remote crash and possible code execution.

USN-8563-5 provides a better fix for CVE-2026-42533 after the original fix from USN-8563-1 was backed out in USN-8563-2 because it caused a regression. The flaw stems from nginx incorrectly handling certain map directives using regex matching and capture variables, allowing a remote attacker to crash nginx, causing denial of service, or possibly execute arbitrary code. The original advisory also described a use-after-free in the ngx_http_ssi_module when configured with Server-Side Includes, proxy_pass, and proxy buffering.

Ubuntu Security NoticesSep 14, 11:35 UTC · 2d agoAdvisory CVE-2026-42533

Oracle Corporation security advisory (AV26-929)

CCCS relays Oracle's September 2026 Critical Patch Update fixing vulnerabilities across WebLogic, Database, E-Business Suite, PeopleSoft, Siebel, and dozens more products.

The Canadian Centre for Cyber Security (AV26-929) relays Oracle's September 2026 Critical Security Patch Update, which addresses vulnerabilities in dozens of product families as of September 15, 2026. Affected products include Oracle WebLogic Server, Database Server, E-Business Suite, Fusion Middleware, PeopleSoft Enterprise, Siebel Applications, GraalVM, VirtualBox, Coherence, and numerous banking and communications suites. The bulletin lists no CVE identifiers and encourages administrators to review Oracle's advisory and apply patches.

Canadian Centre for Cyber SecuritySep 16, 19:29 UTC · 13h agoAdvisory 3 sources