Microsoft Office Online Server vulnerabilities

281 CVEs affecting Microsoft Office Online Server, 1 known to be exploited (CISA KEV), with EPSS scores. Latest: CVE-2026-108446, published 2026-10-15.

More from Microsoft.

Highest priority

Known exploited (CISA KEV) first, then by EPSS exploit probability.

• CVE-2017-11826: Microsoft Office Remote Code Execution Vulnerability, published 2017-10-13. High severity, CVSS 7.8. Actively exploited: in CISA KEV since 2022-03-03. EPSS: 81.3% chance of exploitation in the next 30 days. Microsoft Office 2010, SharePoint Enterprise Server 2010, SharePoint Server 2010, Web Applications, Office Web Apps Server 2010 and 2013, Word Viewer, Word 2007, 2010, 2013 and 2016, Word Automation…
• CVE-2023-21716, published 2023-02-14. Critical severity, CVSS 9.8. EPSS: 84.8% chance of exploitation in the next 30 days. Microsoft Word Remote Code Execution Vulnerability
• CVE-2023-32029, published 2023-06-14. High severity, CVSS 7.8. EPSS: 53.5% chance of exploitation in the next 30 days. Microsoft Excel Remote Code Execution Vulnerability
• CVE-2021-34501, published 2021-07-14. High severity, CVSS 7.8. EPSS: 51.7% chance of exploitation in the next 30 days. Microsoft Excel Remote Code Execution Vulnerability
• CVE-2023-33133, published 2023-06-14. High severity, CVSS 7.8. EPSS: 44% chance of exploitation in the next 30 days. Microsoft Excel Remote Code Execution Vulnerability
• CVE-2018-0792, published 2018-01-10. High severity, CVSS 8.8. EPSS: 28.3% chance of exploitation in the next 30 days. Microsoft Word 2016 in Microsoft Office 2016 allows a remote code execution vulnerability due to the way objects are handled in memory, aka "Microsoft Word Remote Code Execution Vulnerability". This…
• CVE-2016-3282, published 2016-07-13. High severity, CVSS 7.8. EPSS: 26.3% chance of exploitation in the next 30 days. Microsoft Word 2007 SP3, Office 2010 SP2, Word 2010 SP2, Word 2013 SP1, Word 2013 RT SP1, Word 2016, Word for Mac 2011, Word 2016 for Mac, Office Compatibility Pack SP3, Word Viewer, Word Automation…
• CVE-2018-0797, published 2018-01-10. High severity, CVSS 7.8. EPSS: 24.8% chance of exploitation in the next 30 days. Microsoft Office 2010, Microsoft Office 2013, and Microsoft Office 2016 allow a remote code execution vulnerability due to the way RTF content is handled, aka "Microsoft Word Memory Corruption…
• CVE-2017-8501, published 2017-07-11. High severity, CVSS 7.8. EPSS: 22.5% chance of exploitation in the next 30 days. Microsoft Office allows a remote code execution vulnerability due to the way that it handles objects in memory, aka "Microsoft Office Memory Corruption Vulnerability". This CVE ID is unique from…
• CVE-2017-8512, published 2017-06-15. High severity, CVSS 8.8. EPSS: 22.1% chance of exploitation in the next 30 days. A remote code execution vulnerability exists in Microsoft Office when the software fails to properly handle objects in memory, aka "Office Remote Code Execution Vulnerability". This CVE ID is unique…

Latest

• CVE-2026-108446, published 2026-10-15. High severity, CVSS 8.8. EPSS: 0.4% chance of exploitation in the next 30 days. Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.
• CVE-2026-97780, published 2026-10-13. High severity, CVSS 8.8. EPSS: 0.8% chance of exploitation in the next 30 days. Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.
• CVE-2026-97779, published 2026-10-13. Medium severity, CVSS 6.5. EPSS: 0.8% chance of exploitation in the next 30 days. Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information over a network.
• CVE-2026-97778, published 2026-10-13. High severity, CVSS 8.8. EPSS: 0.6% chance of exploitation in the next 30 days. Integer overflow or wraparound in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.
• CVE-2026-97777, published 2026-10-13. High severity, CVSS 8.8. EPSS: 0.7% chance of exploitation in the next 30 days. Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.
• CVE-2026-97776, published 2026-10-13. High severity, CVSS 8.8. EPSS: 0.8% chance of exploitation in the next 30 days. Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.
• CVE-2026-97775, published 2026-10-13. High severity, CVSS 8.8. EPSS: 0.7% chance of exploitation in the next 30 days. Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.
• CVE-2026-97773, published 2026-10-13. High severity, CVSS 8.8. EPSS: 0.7% chance of exploitation in the next 30 days. Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.
• CVE-2026-97772, published 2026-10-13. High severity, CVSS 8.8. EPSS: 0.7% chance of exploitation in the next 30 days. Double free in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.
• CVE-2026-97771, published 2026-10-13. High severity, CVSS 8.8. EPSS: 0.7% chance of exploitation in the next 30 days. Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.