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UK cyber threats that need action now

Updated 3 Nov 2026, 00:00 UK time

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Updated 8 Nov 2026, 15:05 UK time

Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information over a network
Type Vulnerability
Microsoft is announcing the availability of the security updates for Microsoft Office for Mac.
Microsoft 365 Apps Microsoft Office 2021 Microsoft Office 2024+1 more
CVE-2026-97760Updated 1 Nov
Integer underflow (wrap or wraparound) in Microsoft Office Excel allows an unauthorized attacker to execute code over a network
Type Vulnerability
Microsoft is announcing the availability of the security updates for Microsoft Office for Mac.
Microsoft 365 Apps Microsoft Office 2021 Microsoft Office 2024+1 more
CVE-2026-97746Updated 1 Nov
Stack-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code over a network
Type Vulnerability
Microsoft is announcing the availability of the security updates for Microsoft Office for Mac.
Microsoft 365 Apps Microsoft Office 2021 Microsoft Office 2024+1 more
CVE-2026-97742Updated 1 Nov
Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code over a network
Type Vulnerability
Microsoft is announcing the availability of the security updates for Microsoft Office for Mac.
Microsoft 365 Apps Microsoft Office 2021 Microsoft Office 2024+1 more
CVE-2026-97771Updated 1 Nov
Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code over a network
Type Vulnerability
Microsoft is announcing the availability of the security updates for Microsoft Office for Mac.
Microsoft 365 Apps Microsoft Office 2021 Microsoft Office 2024+1 more
CVE-2026-97751Updated 1 Nov
Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code over a network
Type Vulnerability
Microsoft is announcing the availability of the security updates for Microsoft Office for Mac.
Microsoft 365 Apps Microsoft Office 2021 Microsoft Office 2024+1 more
CVE-2026-100212Updated 1 Nov
Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code over a network
Type Vulnerability
Microsoft is announcing the availability of the security updates for Microsoft Office for Mac.
Microsoft 365 Apps Microsoft Office 2021 Microsoft Office 2024+1 more
CVE-2026-97768Updated 1 Nov
Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code over a network
Type Vulnerability
Microsoft is announcing the availability of the security updates for Microsoft Office for Mac.
Microsoft 365 Apps Microsoft Office 2021 Microsoft Office 2024+1 more
CVE-2026-100210Updated 1 Nov
Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code over a network
Type Vulnerability
Microsoft is announcing the availability of the security updates for Microsoft Office for Mac.
Microsoft 365 Apps Microsoft Office 2021 Microsoft Office 2024+1 more
CVE-2026-97752Updated 31 Oct
Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code over a network
Type Vulnerability
Microsoft is announcing the availability of the security updates for Microsoft Office for Mac.
Microsoft 365 Apps Microsoft Office 2021 Microsoft Office 2024+1 more
CVE-2026-97766Updated 31 Oct
Microsoft Patch Tuesday, October 2026 Security Update Review
Type Research & news
Microsoft is announcing the availability of security updates for Microsoft Office for Mac.
Microsoft 365 Apps Microsoft Office 2021 Microsoft Office 2024+1 more
CVE-2026-97740Updated 24 Oct
Microsoft Patch Tuesday, October 2026 Security Update Review
Type Research & news
Microsoft is announcing the availability of security updates for Microsoft Office for Mac.
Microsoft 365 Apps Microsoft Office 2021 Microsoft Office 2024+1 more
CVE-2026-97017Updated 24 Oct
Microsoft Patch Tuesday, October 2026 Security Update Review
Type Research & news
Microsoft is announcing the availability of security updates for Microsoft Office for Mac.
Microsoft 365 Apps Microsoft Office 2021 Microsoft Office 2024+1 more
CVE-2026-97753Updated 24 Oct
Microsoft Patch Tuesday, October 2026 Security Update Review
Type Research & news
Microsoft is announcing security updates for Microsoft Office for Mac to protect against a vulnerability.
Microsoft 365 Apps Microsoft Office 2021 Microsoft Office 2024+1 more
CVE-2026-97750Updated 24 Oct
Double free in Microsoft Office Excel allows an unauthorized attacker to execute code over a network
Type Vulnerability
A vulnerability in Microsoft Office Excel could allow an attacker to execute code over a network.
Microsoft 365 Apps Microsoft Office 2021 Microsoft Office 2024+1 more
CVE-2026-97772Updated 15 Oct
Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code over a network
Type Vulnerability
Microsoft is announcing the availability of the security updates for Microsoft Office for Mac.
Microsoft 365 Apps Microsoft Office 2021 Microsoft Office 2024+1 more
CVE-2026-97775Updated 15 Oct
Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code over a network
Type Vulnerability
Microsoft is announcing the availability of the security updates for Microsoft Office for Mac.
Microsoft 365 Apps Microsoft Office 2021 Microsoft Office 2024+1 more
CVE-2026-97763Updated 15 Oct
Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code over a network
Type Vulnerability
Microsoft is announcing the availability of the security updates for Microsoft Office for Mac.
Microsoft 365 Apps Microsoft Office 2021 Microsoft Office 2024+1 more
CVE-2026-97004Updated 15 Oct
Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code over a network
Type Vulnerability
Microsoft is announcing the availability of the security updates for Microsoft Office for Mac.
Microsoft 365 Apps Microsoft Office 2021 Microsoft Office 2024+1 more
CVE-2026-97738Updated 15 Oct
Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code over a network
Type Vulnerability
Microsoft is announcing the availability of the security updates for Microsoft Office for Mac.
Microsoft 365 Apps Microsoft Office 2021 Microsoft Office 2024+1 more
CVE-2026-97757Updated 15 Oct