Vulnerability · CVE-2026-55045
Out-of-bounds read in Microsoft Office allows an unauthorized attacker to execute code locally.
Published Jul 14, 2026 · catalog updated Jul 16, 2026 · sharepoint server
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-2026-55045. EPSS is 0.45%. Act only if a listed version of sharepoint server is installed.
Gaps on this record
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
Same product and reporting
- CVE-2026-108452 · High
- CVE-2026-70259 · Medium
- CVE-2026-70267 · High
- CVE-2026-69943 · High
- CVE-2026-105719 · Medium
- Severity
- High8.4
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 0.45%
- Remediation
- Version ranges on file
- Affected products
- cpe microsoft/365 apps · cpe microsoft/microsoft 365 · cpe microsoft/office 2016 · cpe microsoft/sharepoint server
Out-of-bounds read in Microsoft Office allows an unauthorized attacker to execute code 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/microsoft 365version unspecified
- cpe microsoft/office 2016version unspecified
- cpe microsoft/sharepoint server< 16.0.19725.20434
How to fix CVE-2026-55045
Upgrade
CVE-2026-55045 lists a fix boundary at 16.0.19725.20434. Compare the installed build with that boundary before you change production.
Version check
Affected < 16.0.19725.20434
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-2026-55045. EPSS is 0.45%. Act only if a listed version of sharepoint server is installed.
Which versions are affected?
Compare what you have installed with 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 0.45%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Technology hubs
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 allows an unauthorized attacker to execute code locally.
Jul 16, 2026 · Monitored products — critical
Updated
Out-of-bounds read in Microsoft Office allows an unauthorized attacker to execute code locally.
Sources
- Monitored products — criticalVendor advisoryCVE-2026-55045
Out-of-bounds read in Microsoft Office allows an unauthorized attacker to execute code 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