PT-2026-58284 · Microsoft · Sharepoint Server

Published 2026-07-14 · Updated 2026-07-15 · CVE-2026-58644

Positive Technologies (AI Summary)

CVSS v3.1

9.8

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Microsoft Office SharePoint (affected versions not specified)

Description An unauthenticated attacker can execute code over a network due to the deserialization of untrusted data. Deserialization is the process of converting a data stream back into an object, which can be exploited if the input is not properly validated.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

RCE

Deserialization of Untrusted Data

Weakness Enumeration

CWE-502

Related Identifiers

CVE-2026-58644

Affected Products

Sharepoint Server

References · 8

• https://nvd.nist.gov/vuln/detail/CVE-2026-58644 · Security Note
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58644 · Vendor Advisory
• https://twitter.com/ThreatAft/status/2077271060366672176 · Twitter Post
• https://twitter.com/SecAlertsCo/status/2077493704860795237 · Twitter Post
• https://twitter.com/thecircuitry_/status/2077185958349316266 · Twitter Post
• https://twitter.com/SecurityAr58409/status/2077334469875319160 · Twitter Post
• https://twitter.com/theluemmel/status/2077359808252932467 · Twitter Post
• https://reddit.com/r/pwnhub/comments/1uxdnnq/cisa_urges_immediate_patching_of_actively · Reddit Post