CRITICAL CISA KEV

CVE-2026-50522

CVSS v3

9.8

CRITICAL

EPSS Score

3.0 %

exploit probability, as of 2026-10-19

CISA KEV

Yes

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Neither OSV.dev nor the vendor advisories we read list affected versions for CVE-2026-50522 yet.

Full record on NVD

Description

Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.

CISA Known Exploited Vulnerability

Date Added: 2026-07-22
Patch Due Date: 2026-07-25
Ransomware Use: Unknown

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: 2026-07-14
Last Modified: 2026-07-15
CERT-FR Advisory: CERTFR-2026-ALE-008
CERT-FR Link: CERTFR-2026-ALE-008

Frequently asked questions

What is CVE-2026-50522?

Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.

Is CVE-2026-50522 actively exploited?

Yes. CVE-2026-50522 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2026-07-25.

What is the CVSS score for CVE-2026-50522?

CVE-2026-50522 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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