PatchTheCVECVE-2026-55050: Out-of-bounds read in Microsoft Office Word allows an unauthorized attacker to disclose information locally.
36
Routine
MEDIUM 5.5WATCHLISTMITIGATEMITIGATEMITIGATE
CVE-2026-55050 is a medium-severity flaw (CVSS 5.5) affecting 365 apps, microsoft 365, office 2019. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Out-of-bounds read in Microsoft Office Word allows an unauthorized attacker to disclose information locally.
Why this priority
- On your watchlist
A fixed release or distro patch exists.
Risk facts
| CVSS score | 5.5 (Medium) |
| Attack vector | Local |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | Required |
| EPSS exploit chance | 0.6% (top 52%) |
| CISA exploited list | No |
| Weakness | CWE-125 |
| Published | 2026-07-14 |
| Last modified | 2026-07-16 |
Publisher (CNA): Microsoft Corporation · Vendor: microsoft
Last updated 2026-07-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
microsoft 365 apps MITIGATE
Affected: all versions
Fixed in: no fixed release known
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy 365-apps || rpm -q 365-apps || 365-apps --version
No fixed or unaffected release known
Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.
microsoft microsoft 365 MITIGATE
Affected: all versions
Fixed in: no fixed release known
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy microsoft-365 || rpm -q microsoft-365 || microsoft-365 --version
No fixed or unaffected release known
Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.
microsoft office 2019 MITIGATE
Affected: all versions
Fixed in: no fixed release known
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy office-2019 || rpm -q office-2019 || office-2019 --version
No fixed or unaffected release known
Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.
microsoft office 2021 UPGRADE
Affected: < 16.111.26071215
Fixed in: 16.111.26071215
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy office-2021 || rpm -q office-2021 || office-2021 --version
2. UPGRADE to 16.111.26071215 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade office-2021
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade office-2021
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
microsoft office 2021 MITIGATE
Affected: all versions
Fixed in: no fixed release known
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy office-2021 || rpm -q office-2021 || office-2021 --version
No fixed or unaffected release known
Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.
microsoft office 2024 UPGRADE
Affected: < 16.111.26071215
Fixed in: 16.111.26071215
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy office-2024 || rpm -q office-2024 || office-2024 --version
2. UPGRADE to 16.111.26071215 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade office-2024
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade office-2024
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-55050?
365 apps: mitigate or apply the listed mitigation; microsoft 365: mitigate or apply the listed mitigation; office 2019: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.
Is CVE-2026-55050 being exploited?
CVE-2026-55050 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-55050 affect?
CVE-2026-55050 affects 365 apps, microsoft 365, office 2019. Severity is medium (CVSS 5.5). Out-of-bounds read in Microsoft Office Word allows an unauthorized attacker to disclose information locally.
How urgent is CVE-2026-55050?
Priority 36/100. On your watchlist
Software pages
Microsoft Office vulnerabilities
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