CVE-2026-59133Network attack vector

Authenticated network privilege escalation

Published Aug 11, 2026 · Updated Aug 25, 2026

Microsoft Windows App Client for Windows Desktop before 2.0.1193.0 allows remote authenticated users to elevate privileges over a network. Microsoft's CNA record describes the bug only as execution with unnecessary privileges in the HPC Pack component and does not disclose the affected function, request path, or privilege check, so the faulty operation remains undisclosed publicly. Valid credentials and network reachability to the relevant service are required; published scoring indicates full confidentiality, integrity, and availability impact after successful escalation.

CVSS severity8.8
High
EPSS probability0.94%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Microsoft Windows App Client for Windows Desktop before 2.0.1193.0 allows remote authenticated users to elevate privileges over a network. Microsoft's CNA record describes the bug only as execution with unnecessary privileges in the HPC Pack component and does not disclose the affected function, request path, or privilege check, so the faulty operation remains undisclosed publicly. Valid credentials and network reachability to the relevant service are required; published scoring indicates full confidentiality, integrity, and availability impact after successful escalation.

The record

CVE
CVE-2026-59133
Published
Aug 11, 2026
Updated
Aug 25, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-250, T1068
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.8NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.8Microsoft CNACVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-250Execution with Unnecessary Privileges
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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