Vulnerability · CVE-2026-55050
Out-of-bounds read in Microsoft Office Word allows an unauthorized attacker to disclose information locally.
Published Jul 14, 2026 · catalog updated Jul 16, 2026 · office 2021
Last checked Nov 2, 2026. A connected source was read within the last 7 days.
Check if you run it
No confirmed exploitation is on record for CVE-2026-55050. EPSS is 0.60%. Act only if a listed version of office 2021 is installed.
Gaps on this record
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
- Severity
- Medium5.5
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 0.60%
- Remediation
- Version ranges on file
- Affected products
- cpe microsoft/365 apps · cpe microsoft/office 2021 · cpe microsoft/office 2024 · cpe microsoft/office online server · cpe microsoft/sharepoint server
Out-of-bounds read in Microsoft Office Word allows an unauthorized attacker to disclose information locally.
Are you affected?
Enter the version you run. The result uses only the ranges stored on this record.
The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.
- cpe microsoft/365 appsversion unspecified
- cpe microsoft/office 2021< 16.111.26071215
- cpe microsoft/office 2024< 16.111.26071215
- cpe microsoft/office online server< 16.0.10417.20175
- cpe microsoft/sharepoint server< 16.0.19725.20434
How to fix CVE-2026-55050
Upgrade
CVE-2026-55050 lists a fix boundary at 16.111.26071215. Compare the installed build with that boundary before you change production.
Version check
Affected < 16.111.26071215
Advisory
Open the inventory_critical record and follow its fix.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-2026-55050. EPSS is 0.60%. Act only if a listed version of office 2021 is installed.
Which versions are affected?
Compare what you have installed with microsoft/office 2021 < 16.111.26071215; microsoft/office 2024 < 16.111.26071215; microsoft/office online server < 16.0.10417.20175; microsoft/sharepoint server < 16.0.19725.20434. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
CWE-125: Out-of-bounds Read. EPSS 0.60%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Jul 14, 2026 · Monitored products — critical
Detected
Out-of-bounds read in Microsoft Office Word allows an unauthorized attacker to disclose information locally.
Jul 16, 2026 · Monitored products — critical
Updated
Out-of-bounds read in Microsoft Office Word allows an unauthorized attacker to disclose information locally.
Sources
- Monitored products — criticalVendor advisoryCVE-2026-55050
Out-of-bounds read in Microsoft Office Word allows an unauthorized attacker to disclose information locally.
nvd.nist.gov
References
Freshness
Last verified in this catalog Nov 2, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.
- Monitored products — criticalNov 2, 2026