SB2026031116 - Multiple vulnerabilities in Microsoft Office

Description

This security bulletin contains information about 3 vulnerabilities.

1) Type Confusion (CVE-ID: CVE-2026-26110)

CWE-ID: CWE-843 - Type confusion

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a type confusion error in Microsoft Office. A remote attacker can pass specially crafted data to the application, trigger a type confusion error and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

2) Untrusted Pointer Dereference (CVE-ID: CVE-2026-26113)

CWE-ID: CWE-822 - Untrusted Pointer Dereference

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber

The vulnerability allows a remote attacker to execute arbitrary code on the system.

The vulnerability exists due to untrusted pointer dereference in Microsoft Office. A remote attacker can execute arbitrary code on the target system.

3) Integer overflow (CVE-ID: CVE-2026-26134)

CWE-ID: CWE-190 - Integer overflow

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a local user to escalate privileges on the target system.

The vulnerability exists due to integer overflow in Microsoft Office. A local user can pass specially crafted data to the application, trigger integer overflow and gain elevated privileges on the system.

Remediation

Install update from vendor's website.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26110
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26113
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26134