Is CVE-2026-55016 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-55016 being exploited in the wild.

How severe is CVE-2026-55016?

Medium severity, with a CVSS score of 4.6, published 14 July 2026.

Which products and versions are affected?

Microsoft SharePoint Enterprise Server 2016 < 16.0.5561.1001; Microsoft SharePoint Server 2019 < 16.0.10417.20175; Microsoft SharePoint Server Subscription Edition < 16.0.19725.20434.

Is there a fix for CVE-2026-55016?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-55016 attacked?

It is attacked over the network, in a network appliance.

Am I affected by CVE-2026-55016?

Check whether you run Microsoft SharePoint Enterprise Server 2016, Microsoft SharePoint Server 2019 or Microsoft SharePoint Server Subscription Edition at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-55016: Microsoft SharePoint cross-site scripting vulnerability

Q: Is there a fix for CVE-2026-55016?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

Q: How is CVE-2026-55016 attacked?

It is attacked over the network, in a network appliance.

Q: Am I affected by CVE-2026-55016?

Check whether you run Microsoft SharePoint Enterprise Server 2016, Microsoft SharePoint Server 2019 or Microsoft SharePoint Server Subscription Edition at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-55016 · Severity: medium · CVSS 4.6 · Published 2026-07-14

Microsoft SharePoint is a widely used collaboration and document management platform. A vulnerability in this system allows an authenticated user to perform a cross-site scripting (XSS) attack, which could be used to spoof content or trick other users into performing unintended actions. This could lead to unauthorized access to sensitive information or the manipulation of web content within the corporate environment.

Technologies: Microsoft SharePoint Enterprise Server 2016, Microsoft SharePoint Server 2019, Microsoft SharePoint Server Subscription Edition. Vendors: Microsoft.

Quick answers

Is CVE-2026-55016 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-55016 being exploited in the wild.
How severe is CVE-2026-55016?: Medium severity, with a CVSS score of 4.6, published 14 July 2026.
Which products and versions are affected?: Microsoft SharePoint Enterprise Server 2016 < 16.0.5561.1001; Microsoft SharePoint Server 2019 < 16.0.10417.20175; Microsoft SharePoint Server Subscription Edition < 16.0.19725.20434.
Is there a fix for CVE-2026-55016?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-55016 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-55016?: Check whether you run Microsoft SharePoint Enterprise Server 2016, Microsoft SharePoint Server 2019 or Microsoft SharePoint Server Subscription Edition at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A cross-site scripting (XSS) vulnerability exists in Microsoft SharePoint due to improper neutralization of input during web page generation (CWE-79). An authenticated attacker with low privileges can exploit this vulnerability over the network, though it requires interaction from a victim (user interaction). Successful exploitation allows the attacker to perform spoofing and potentially gain unauthorized access to data or execute scripts in the context of the victim's browser session. The vulnerability affects SharePoint Enterprise Server 2016, SharePoint Server 2019, and SharePoint Server Subscription Edition.

Affected products

Microsoft SharePoint Enterprise Server 2016 < 16.0.5561.1001
Microsoft SharePoint Server 2019 < 16.0.10417.20175
Microsoft SharePoint Server Subscription Edition < 16.0.19725.20434

Timeline

2026-07-14: disclosed
2026-07-14: advisory

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55016

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