CVE-2023-28311
CVE-2023-28311 is a high-severity vulnerability in Microsoft 365 Apps with a CVSS 3.x base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-122.
Key facts
- Severity: High (CVSS 3.x base score 7.8)
- EPSS exploit prediction: 3% (84th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-122
- Affected product: Microsoft 365 Apps
- Published:
- Last modified:
Description
Microsoft Word Remote Code Execution Vulnerability
Frequently asked questions
- What is CVE-2023-28311?
- Microsoft Word Remote Code Execution Vulnerability
- How severe is CVE-2023-28311?
- CVE-2023-28311 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2023-28311 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2023-28311?
- CVE-2023-28311 primarily affects Microsoft 365 Apps. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2023-28311?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- When was CVE-2023-28311 published?
- CVE-2023-28311 was published on 2023-04-11 and last updated on 2026-06-17.
References
Affected products (3)
- cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:*:*
- cpe:2.3:a:microsoft:office:2019:*:*:*:*:macos:*:*
- cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:macos:*:*
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