How severe is CVE-2015-2531?

CVE-2015-2531 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2015-2531 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-2015-2531?

CVE-2015-2531 primarily affects Microsoft Lync Server. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2015-2531?

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

When was CVE-2015-2531 published?

CVE-2015-2531 was published on 2015-09-09 and last updated on 2026-06-17.

CVE-2015-2531

CVE-2015-2531 is a medium-severity vulnerability in Microsoft Lync Server 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 Lync Server
Published: 2015-09-09
Last modified: 2026-06-17

Description

Cross-site scripting (XSS) vulnerability in the jQuery engine in Microsoft Lync Server 2013 and Skype for Business Server 2015 allows remote attackers to inject arbitrary web script or HTML via a crafted URL, aka "Skype for Business Server and Lync Server XSS Information Disclosure Vulnerability."

Frequently asked questions

What is CVE-2015-2531?: Cross-site scripting (XSS) vulnerability in the jQuery engine in Microsoft Lync Server 2013 and Skype for Business Server 2015 allows remote attackers to inject arbitrary web script or HTML via a crafted URL, aka "Skype for Business Server and Lync Server XSS Information Disclosure Vulnerability."
How severe is CVE-2015-2531?: CVE-2015-2531 has a CVSS 2.0 base score of 4.3, rated medium severity.
Is CVE-2015-2531 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-2015-2531?: CVE-2015-2531 primarily affects Microsoft Lync Server. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2015-2531?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2015-2531 published?: CVE-2015-2531 was published on 2015-09-09 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:a:microsoft:lync_server:2013:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:skype_for_business_server:2015:*:*:*:*:*:*:*

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