How severe is CVE-2012-1858?

CVE-2012-1858 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2012-1858 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 22% (97th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2012-1858?

CVE-2012-1858 primarily affects Microsoft Lync. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2012-1858?

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

When was CVE-2012-1858 published?

CVE-2012-1858 was published on 2012-06-12 and last updated on 2026-06-16.

CVE-2012-1858

CVE-2012-1858 is a medium-severity vulnerability in Microsoft Lync with a CVSS 2.0 base score of 4.3. Its EPSS exploit-prediction score of 22% places it in the 97th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-200.

Key facts

Severity: Medium (CVSS 2.0 base score 4.3)
EPSS exploit prediction: 22% (97th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-200
Affected product: Microsoft Lync
Published: 2012-06-12
Last modified: 2026-06-16

Description

The toStaticHTML API (aka the SafeHTML component) in Microsoft Internet Explorer 8 and 9, Communicator 2007 R2, and Lync 2010 and 2010 Attendee does not properly handle event attributes and script, which makes it easier for remote attackers to conduct cross-site scripting (XSS) attacks via a crafted HTML document, aka "HTML Sanitization Vulnerability."

Frequently asked questions

What is CVE-2012-1858?: The toStaticHTML API (aka the SafeHTML component) in Microsoft Internet Explorer 8 and 9, Communicator 2007 R2, and Lync 2010 and 2010 Attendee does not properly handle event attributes and script, which makes it easier for remote attackers to conduct cross-site scripting (XSS) attacks via a crafted HTML document, aka "HTML Sanitization Vulnerability."
How severe is CVE-2012-1858?: CVE-2012-1858 has a CVSS 2.0 base score of 4.3, rated medium severity.
Is CVE-2012-1858 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 22% (97th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2012-1858?: CVE-2012-1858 primarily affects Microsoft Lync. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2012-1858?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2012-1858 published?: CVE-2012-1858 was published on 2012-06-12 and last updated on 2026-06-16.

References

Affected products (6)

cpe:2.3:a:microsoft:lync:2010:*:attendee:*:*:*:*:*
cpe:2.3:a:microsoft:lync:2010:*:x64:*:*:*:*:*
cpe:2.3:a:microsoft:lync:2010:*:x86:*:*:*:*:*
cpe:2.3:a:microsoft:office_communicator:2007:r2:*:*:*:*:*:*
cpe:2.3:a:microsoft:internet_explorer:8:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:internet_explorer:9:*:*:*:*:*:*:*

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