How severe is CVE-2011-1891?

CVE-2011-1891 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2011-1891 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 17% (97th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-1891?

CVE-2011-1891 primarily affects Microsoft Sharepoint Foundation. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2011-1891?

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

When was CVE-2011-1891 published?

CVE-2011-1891 was published on 2011-09-15 and last updated on 2026-06-16.

CVE-2011-1891

CVE-2011-1891 is a medium-severity vulnerability in Microsoft Sharepoint Foundation with a CVSS 2.0 base score of 4.3. Its EPSS exploit-prediction score of 17% places it in the 97th 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: 17% (97th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Microsoft Sharepoint Foundation
Published: 2011-09-15
Last modified: 2026-06-16

Description

Cross-site scripting (XSS) vulnerability in Microsoft Windows SharePoint Services 3.0 SP2, and SharePoint Foundation 2010 Gold and SP1, allows remote attackers to inject arbitrary web script or HTML via unspecified parameters in a request to a script, aka "Contact Details Reflected XSS Vulnerability."

Frequently asked questions

What is CVE-2011-1891?: Cross-site scripting (XSS) vulnerability in Microsoft Windows SharePoint Services 3.0 SP2, and SharePoint Foundation 2010 Gold and SP1, allows remote attackers to inject arbitrary web script or HTML via unspecified parameters in a request to a script, aka "Contact Details Reflected XSS Vulnerability."
How severe is CVE-2011-1891?: CVE-2011-1891 has a CVSS 2.0 base score of 4.3, rated medium severity.
Is CVE-2011-1891 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 17% (97th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-1891?: CVE-2011-1891 primarily affects Microsoft Sharepoint Foundation. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2011-1891?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2011-1891 published?: CVE-2011-1891 was published on 2011-09-15 and last updated on 2026-06-16.

References

Affected products (4)

cpe:2.3:a:microsoft:sharepoint_foundation:2010:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:sharepoint_foundation:2010:sp1:*:*:*:*:*:*
cpe:2.3:a:microsoft:sharepoint_services:3.0:sp2:x32:*:*:*:*:*
cpe:2.3:a:microsoft:sharepoint_services:3.0:sp2:x64:*:*:*:*:*

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