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Excel For Mac CVE-2015-6123

MEDIUM
Cross-site Scripting (XSS) (CWE-79)
2015-11-11 secure@microsoft.com
XSS Microsoft Excel For Mac
4.3
CVSS 2.0 · NVD
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Vulnerability Assessment

Weakness
CWE
CWE-79
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V1 - Encoding and Sanitization Output encoding, context-aware escaping
MITRE ATT&CK

2 techniques across 2 tactics: Initial Access, Execution

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

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Impact

CVSS score of 4.3 (MEDIUM). Attack characteristics: network attack vector, M complexity. EPSS exploitation probability: 10.37%.
Exploit ScenarioDerived

A remote attacker could inject malicious scripts into web pages viewed by other users by sending crafted requests to the affected application.
This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
No patch listed yet 10.4% exploitation probability (EPSS)

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AnalysisAI

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. Rated medium severity (CVSS 4.3), this vulnerability is remotely exploitable. Epss exploitation probability 10.4% and no vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Sanitize all user input, use Content-Security-Policy headers, encode output contextually (HTML, JS, URL). Use frameworks with built-in XSS protection.

Affects your stack

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Technical ContextAI · show details

This vulnerability is classified as Cross-Site Scripting (XSS) (CWE-79), which allows attackers to inject malicious scripts into web pages viewed by other users. 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." Affected products include: Microsoft Excel For Mac.

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  • Exploit and PoC references, threat intelligence from 22 sources
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Severity by source

NVD PRIMARY 4.3 MEDIUM
AV:N/AC:M/Au:N/C:N/I:P/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
M
Confidentiality
None
Integrity
P
Availability
None

DescriptionCVE.org

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."

Threat Intelligence Overview

EPSS Score
10.4%
Top 7% exploitable
Data Quality
3 sources
Confidence: Low
NVD CVE.org EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC No
EPSS 10.4%
Patch available No
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
No
Human Impact· derived
Medium

Priority Score

32
Low Medium High Critical
KEV: 0
EPSS: +10
CVSS: +22
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Cross-Site Scripting MEDIUM

Cross-Site Scripting occurs when an application accepts untrusted data and sends it to a web browser without proper validation or encoding.

Affected Products (CPE)CVE.org

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

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References

Advisories & patches
REF http://www.securityfocus.com/bid/77525 REF http://www.securitytracker.com/id/1034122 REF https://docs.microsoft.com/en-us/security-updates/securitybulletins/2015/ms15-116

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