CVE-2026-55054: Out-of-bounds Read

Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information over a network...

PT-2026-58536

Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to execute code locally...

CVE-2026-55949: Use of Uninitialized Resource

Use of uninitialized resource in Microsoft Office Excel allows an unauthorized attacker to execute code locally...

CVE-2026-55048: Integer Overflow or Wraparound

Integer overflow or wraparound in Microsoft Office Excel allows an unauthorized attacker to execute code locally...

CVE-2026-48580: Untrusted Pointer Dereference

Untrusted pointer dereference in Microsoft Office Excel allows an unauthorized attacker to disclose information locally...

PT-2026-58590

Use of uninitialized resource in Microsoft Office Excel allows an unauthorized attacker to execute code locally...

PT-2026-58298

Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code locally...

CVE-2026-55053: Heap-based Buffer Overflow

Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally...

CVE-2026-55041: Heap-based Buffer Overflow

Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally...

CVE-2026-55141: Stack-based Buffer Overflow

Stack-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally...

PT-2026-58550

Name of the Vulnerable Software and Affected Versions Microsoft Office Excel affected versions not specified Description An out-of-bounds read exists in Microsoft Office Excel, which allows an unauthorized attacker to disclose sensitive information locally through the use of malicious content...

CVE-2026-55044: Out-of-bounds Read

Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to execute code locally...

PT-2026-58557

Name of the Vulnerable Software and Affected Versions Microsoft Office Excel affected versions not specified Description A heap-based buffer overflow exists in Microsoft Office Excel, which allows an unauthorized attacker to execute code locally. This issue can be triggered when a user opens a...

CVE-2026-55131: Heap-based Buffer Overflow

Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally...

PT-2026-58545

Name of the Vulnerable Software and Affected Versions Microsoft Office Excel affected versions not specified Description A heap-based buffer overflow exists in Microsoft Office Excel, which could allow an unauthorized attacker to execute arbitrary code locally on the system. This occurs when a us...

CVE-2026-55024: Access of Resource Using Incompatible Type

Access of resource using incompatible type 'type confusion' in Microsoft Office Excel allows an unauthorized attacker to execute code locally...

CVE-2026-55137: Heap-based Buffer Overflow

Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally...

Security Updates for Microsoft Office Online Server (July 2026)

The Microsoft Office Online Server or Office Web Apps installation on the remote host is missing security updates. It is, therefore, affected by multiple vulnerabilities: - Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code locally. CVE-2026-47642,...

CVE-2026-55058: Out-of-bounds Read

Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to execute code locally...

PT-2026-58574

Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally...