CVE-2026-21259

Description

References

• msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21259 · Vendor Advisory

More vulnerabilities in excel

• CVE-2026-85875MEDIUM 5.5Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.
• CVE-2026-81960HIGH 7.8Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
• CVE-2026-81959HIGH 7.8Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
• CVE-2026-81958MEDIUM 5.5Use of uninitialized resource in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.
• CVE-2026-81957HIGH 7.8Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to execute code locally.