NPM · JULY 2026 · EARLY WARNING

SharePoint Vulnerability CVE-2026-50522 Under Investigation

EARLY WARNING · UNCONFIRMED. This page describes a developing threat that 0Day surfaced from early signals and has not yet independently confirmed. Details may change. Always verify against the primary sources before acting.

CVE-2026-50522Severity: HIGH

An early warning has been issued regarding CVE-2026-50522, a vulnerability in the SharePoint npm package that appears to be exploited by threat actors to steal machine keys and retain long-term access.

What happened

CVE-2026-50522 is a critical remote code execution vulnerability in SharePoint stemming from deserialization of untrusted data. It was fixed by Microsoft on July 14, 2026 with its latest Patch Tuesday updates. This is the fourth SharePoint vulnerability reportedly exploited in the past month.

To assess your exposure, check if you are using the affected SharePoint npm package. If so, upgrade to the latest version as soon as possible. Additionally, rotate any machine keys that may have been compromised.

For more details, consult the primary sources. The severity of this vulnerability is high, and prompt action is recommended to mitigate potential risks.

How 0Day mitigates this

MATCHED TO YOUR ACTUAL DEPENDENCY GRAPH0Day matches every incoming threat signal against your GitHub organization’s full dependency graph, including transitive dependencies. If sharepoint is anywhere in your dependency tree, the engineers who own the affected repositories get a push alert the moment it is flagged — no manual audit to remember to run.

Read how this differs from waiting on a scanner to catch a known advisory, or see the exact, read-only access 0Day needs to do this for an organization.

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