How severe is CVE-2015-6123?

CVE-2015-6123 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2015-6123 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 11% (95th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2015-6123?

CVE-2015-6123 primarily affects Microsoft Excel For Mac. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2015-6123?

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

When was CVE-2015-6123 published?

CVE-2015-6123 was published on 2015-11-11 and last updated on 2026-06-17.

CVE-2015-6123

CVE-2015-6123 is a medium-severity vulnerability in Microsoft Excel For Mac with a CVSS 2.0 base score of 4.3. Its EPSS exploit-prediction score of 11% places it in the 95th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 2.0 base score 4.3)
EPSS exploit prediction: 11% (95th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Microsoft Excel For Mac
Published: 2015-11-11
Last modified: 2026-06-17

Description

Cross-site scripting (XSS) vulnerability in Microsoft Excel for Mac 2011 and Excel 2016 for Mac allows remote attackers to inject arbitrary web script or HTML via a crafted e-mail message that is mishandled by Outlook for Mac, aka "Microsoft Outlook for Mac Spoofing Vulnerability."

Frequently asked questions

What is CVE-2015-6123?: Cross-site scripting (XSS) vulnerability in Microsoft Excel for Mac 2011 and Excel 2016 for Mac allows remote attackers to inject arbitrary web script or HTML via a crafted e-mail message that is mishandled by Outlook for Mac, aka "Microsoft Outlook for Mac Spoofing Vulnerability."
How severe is CVE-2015-6123?: CVE-2015-6123 has a CVSS 2.0 base score of 4.3, rated medium severity.
Is CVE-2015-6123 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 11% (95th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2015-6123?: CVE-2015-6123 primarily affects Microsoft Excel For Mac. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2015-6123?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2015-6123 published?: CVE-2015-6123 was published on 2015-11-11 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:a:microsoft:excel_for_mac:2011:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:excel_for_mac:2016:*:*:*:*:*:*:*

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