CVE-2026-62826: Microsoft SharePoint cross-site scripting vulnerability

CVE-2026-62826 · Severity: medium · CVSS 4.6 · Published 2026-07-16

Microsoft SharePoint, a widely used platform for document management and team collaboration, is affected by a security flaw that could allow an attacker to perform spoofing attacks. By tricking a user into interacting with a malicious link or page, an attacker with basic user permissions could execute unauthorized scripts in the victim's browser. This could lead to the unauthorized viewing of sensitive documents or the performance of actions on behalf of the victim within the SharePoint environment.

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

Quick answers

Is CVE-2026-62826 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-62826 being exploited in the wild.
How severe is CVE-2026-62826?
Medium severity, with a CVSS score of 4.6, published 16 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-2026-62826?
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-2026-62826 attacked?
It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-62826?
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 (CWE-79) exists in Microsoft Office SharePoint due to improper neutralization of input during web page generation. An attacker with low-level authenticated permissions (PR:L) can exploit this by sending a specially crafted request to a vulnerable SharePoint server. Successful exploitation requires a victim to interact with a malicious link or page (UI:R). This allows the attacker to execute arbitrary script in the context of the victim's browser session, potentially leading to information disclosure or unauthorized actions. Microsoft has released security updates for SharePoint Enterprise Server 2016, SharePoint Server 2019, and SharePoint Server Subscription Edition to address this issue.

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

  • 2026-07-16: disclosed
  • 2026-07-16: advisory

References

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