How severe is CVE-2018-8305?

CVE-2018-8305 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2018-8305 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 8% (94th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-8305?

CVE-2018-8305 primarily affects Microsoft Windows Calendar. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2018-8305?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2018-8305 published?

CVE-2018-8305 was published on 2018-07-11 and last updated on 2026-06-17.

CVE-2018-8305

CVE-2018-8305 is a medium-severity vulnerability in Microsoft Windows Calendar with a CVSS 3.x base score of 6.5. 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-200.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 4.3
EPSS exploit prediction: 8% (94th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-200
Affected product: Microsoft Windows Calendar
Published: 2018-07-11
Last modified: 2026-06-17

Description

An information disclosure vulnerability exists in Windows Mail Client when a message is opened, aka "Windows Mail Client Information Disclosure Vulnerability." This affects Mail, Calendar, and People in Windows 8.1 App Store.

Frequently asked questions

What is CVE-2018-8305?: An information disclosure vulnerability exists in Windows Mail Client when a message is opened, aka "Windows Mail Client Information Disclosure Vulnerability." This affects Mail, Calendar, and People in Windows 8.1 App Store.
How severe is CVE-2018-8305?: CVE-2018-8305 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2018-8305 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 8% (94th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-8305?: CVE-2018-8305 primarily affects Microsoft Windows Calendar. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2018-8305?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2018-8305 published?: CVE-2018-8305 was published on 2018-07-11 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:a:microsoft:windows_calendar:-:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:windows_mail:-:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:windows_people:-:*:*:*:*:*:*:*

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