CVE-2026-78519: Microsoft Office Outlook Remote Code Execution Vulnerability
Use of uninitialized resource in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network.
Details
Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78519
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-78519 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
Recent advisories for Microsoft Office Outlook
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
- mediumCVE-2026-80084: Out-of-bounds read in Microsoft Office Outlook allows an unauthorized attacker to disclose inf…nvd · 2026-09-08
- mediumCVE-2026-80073: Out-of-bounds read in Microsoft Office Outlook allows an unauthorized attacker to disclose inf…nvd · 2026-09-08
- highCVE-2026-78525: Use after free in Microsoft Office Outlook allows an unauthorized attacker to execute code ove…nvd · 2026-09-08
- mediumCVE-2026-78520: Out-of-bounds read in Microsoft Office Outlook allows an unauthorized attacker to execute code…nvd · 2026-09-08
- highCVE-2026-78519: Use of uninitialized resource in Microsoft Office Outlook allows an unauthorized attacker to e…nvd · 2026-09-08
- criticalCVE-2026-78509: Heap-based buffer overflow in Microsoft Office Outlook allows an unauthorized attacker to exec…nvd · 2026-09-08
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