Technology · Microsoft
Microsoft Office Online Server vulnerabilities
Updated . Rebuilt every hour.
Junglewise Threat Intelligence has tracked 52 vulnerabilities in Microsoft Office Online Server: 0 in the last 7 days and 3 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, CVE-2026-105718, was published on 13 October 2026. 3 vulnerabilities in the last four weeks, up from none in the four before.
- Last 7 days
- 0
- Last 90 days
- 3
- Critical, all time
- 0
- Exploited in the wild
- 0
About Microsoft Office Online Server
A server that provides browser-based versions of Microsoft Word, PowerPoint, Excel, and OneNote.
Latest Microsoft Office Online Server vulnerabilities
- CVE-2026-105718: Microsoft Office Excel out-of-bounds read in parsinghighCVSS 8.8EPSS 0.8%
- CVE-2026-100212: Microsoft Office Excel use-after-free remote code executionhighCVSS 8.8EPSS 0.8%
- CVE-2026-100210: Microsoft Office Excel heap-based buffer overflowhighCVSS 8.8EPSS 0.8%
- CVE-2026-55949: Microsoft Excel use of uninitialized resource code executionhighCVSS 7.8
- CVE-2026-55947: Microsoft Office Excel heap buffer overflowhighCVSS 7.8
- CVE-2026-55898: Microsoft Office Excel out-of-bounds readmediumCVSS 6.1
- CVE-2026-55141: Microsoft Office Excel stack-based buffer overflowhighCVSS 7.8
- CVE-2026-55138: Microsoft Excel untrusted pointer dereference information disclosuremediumCVSS 5.5
- CVE-2026-55137: Microsoft Office Excel heap buffer overflowhighCVSS 7.8
- CVE-2026-55136: Microsoft Excel untrusted pointer dereference remote code executionhighCVSS 7.8
- CVE-2026-55131: Microsoft Excel heap buffer overflow code executionhighCVSS 7.8
- CVE-2026-55122: Microsoft Excel out-of-bounds read information disclosurehighCVSS 7.1
- CVE-2026-55058: Microsoft Excel out-of-bounds read code executionhighCVSS 7.8
- CVE-2026-55054: Microsoft Excel out-of-bounds read information disclosuremediumCVSS 6.5
- CVE-2026-55053: Microsoft Excel heap buffer overflow code executionhighCVSS 7.8
- CVE-2026-55048: Microsoft Excel integer overflow local code executionhighCVSS 7.8
- CVE-2026-55044: Microsoft Office Excel out-of-bounds read code executionhighCVSS 7.8
- CVE-2026-55041: Microsoft Excel heap buffer overflow code executionhighCVSS 7.8
- CVE-2026-55039: Microsoft Office Excel integer underflow code executionhighCVSS 7.8
- CVE-2026-55037: Microsoft Office Excel heap buffer overflowhighCVSS 7.8
- CVE-2026-55036: Microsoft Excel buffer over-read code executionhighCVSS 7.8
- CVE-2026-55031: Microsoft Excel out-of-bounds read code executionhighCVSS 7.8
- CVE-2026-55029: Microsoft Excel heap buffer overflow in file parsinghighCVSS 7.8
- CVE-2026-55025: Microsoft Excel type confusion code executionhighCVSS 7.8
- CVE-2026-55024: Microsoft Excel type confusion code executionhighCVSS 7.8
Most severe Microsoft Office Online Server vulnerabilities
Exploited in the wild first, then by severity and CVSS score.
- CVE-2026-105718: Microsoft Office Excel out-of-bounds read in parsinghighCVSS 8.8EPSS 0.8%
- CVE-2026-100210: Microsoft Office Excel heap-based buffer overflowhighCVSS 8.8EPSS 0.8%
- CVE-2026-100212: Microsoft Office Excel use-after-free remote code executionhighCVSS 8.8EPSS 0.8%
- CVE-2025-49697: Microsoft Office heap overflow code executionhighCVSS 8.4EPSS 0.6%
- CVE-2025-60727: Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to execute code locally.highCVSS 7.8EPSS 0.7%
- CVE-2025-62563: Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code locally.highCVSS 7.8EPSS 0.6%
- CVE-2025-62556: Untrusted pointer dereference in Microsoft Office Excel allows an unauthorized attacker to execute code locally.highCVSS 7.8EPSS 0.6%
- CVE-2025-62203: Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code locally.highCVSS 7.8EPSS 0.5%
- CVE-2025-62564: Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to execute code locally.highCVSS 7.8EPSS 0.5%
- CVE-2025-62561: Untrusted pointer dereference in Microsoft Office Excel allows an unauthorized attacker to execute code locally.highCVSS 7.8EPSS 0.5%
Vulnerabilities per week
3 vulnerabilities in the last four weeks, up from none in the four before. The last 13 weeks, by the week each vulnerability was published.
| Week of | Bar | Vulns | Critical |
|---|---|---|---|
| 17 Aug 2026 | 0 | 0 | |
| 24 Aug 2026 | 0 | 0 | |
| 31 Aug 2026 | 0 | 0 | |
| 7 Sep 2026 | 0 | 0 | |
| 14 Sep 2026 | 0 | 0 | |
| 21 Sep 2026 | 0 | 0 | |
| 28 Sep 2026 | 0 | 0 | |
| 5 Oct 2026 | 0 | 0 | |
| 12 Oct 2026 | 3 | 0 | |
| 19 Oct 2026 | 0 | 0 | |
| 26 Oct 2026 | 0 | 0 | |
| 2 Nov 2026 | 0 | 0 | |
| 9 Nov 2026 | 0 | 0 |
Embed a badge
A live badge for a README, a status page or an internal wiki: how many Microsoft Office Online Server vulnerabilities were published in the last 7 days and how many of them are critical, refreshed hourly.
[](https://junglewise.ai/threats/technologies/office-online-server)<a href="https://junglewise.ai/threats/technologies/office-online-server"><img src="https://junglewise.ai/threats/technologies/office-online-server/badge.svg" alt="Microsoft Office Online Server vulnerabilities" /></a>How this is built
Junglewise Threat Intelligence collects vulnerabilities from NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories, and matches each one to the technologies and vendors it affects. Dates are the date a vulnerability was published, in UTC.
The pages are rebuilt from the database every hour. Frozen weekly and monthly reports never change once published, so they can be cited.
Use this data
The same data is at https://junglewise.ai/threats/technologies/office-online-server.json, and this page as text at https://junglewise.ai/threats/technologies/office-online-server.md, for scripts and language models. It is free to reuse under CC BY 4.0 with a link back to this page.
Cite as: Junglewise Threat Intelligence, "Microsoft Office Online Server vulnerabilities", https://junglewise.ai/threats/technologies/office-online-server, 13 November 2026.