CVE-2018-8582
CVE-2018-8582 is a high-severity vulnerability in Microsoft Office 365 Proplus with a CVSS 3.x base score of 8.8. Its EPSS exploit-prediction score of 19% places it in the 97th percentile, indicating an elevated likelihood of exploitation.
Key facts
- Severity: High (CVSS 3.x base score 8.8)
- CVSS v2: 9.3
- EPSS exploit prediction: 19% (97th percentile)
- Actively exploited: Not listed in CISA KEV
- Affected product: Microsoft Office 365 Proplus
- Published:
- Last modified:
Description
A remote code execution vulnerability exists in the way that Microsoft Outlook parses specially modified rule export files, aka "Microsoft Outlook Remote Code Execution Vulnerability." This affects Office 365 ProPlus, Microsoft Office, Microsoft Outlook. This CVE ID is unique from CVE-2018-8522, CVE-2018-8524, CVE-2018-8576.
Frequently asked questions
- What is CVE-2018-8582?
- A remote code execution vulnerability exists in the way that Microsoft Outlook parses specially modified rule export files, aka "Microsoft Outlook Remote Code Execution Vulnerability." This affects Office 365 ProPlus, Microsoft Office, Microsoft Outlook. This CVE ID is unique from CVE-2018-8522, CVE-2018-8524, CVE-2018-8576.
- How severe is CVE-2018-8582?
- CVE-2018-8582 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2018-8582 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 19% (97th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2018-8582?
- CVE-2018-8582 primarily affects Microsoft Office 365 Proplus. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2018-8582?
- 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-2018-8582 published?
- CVE-2018-8582 was published on 2018-11-14 and last updated on 2026-06-17.
References
- http://www.securityfocus.com/bid/105825
- http://www.securitytracker.com/id/1042110
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8582
Affected products (6)
- cpe:2.3:a:microsoft:office_365_proplus:-:*:*:*:*:*:*:*
- cpe:2.3:a:microsoft:outlook:2010:sp2:*:*:*:*:*:*
- cpe:2.3:a:microsoft:outlook:2013:sp1:*:*:*:*:*:*
- cpe:2.3:a:microsoft:outlook:2016:*:*:*:*:*:*:*
- cpe:2.3:a:microsoft:outlook_rt:2013:sp1:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_server_2019:-:*:*:*:*:*:*:*
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