Local privilege escalation via untrusted data deserialization
Published Jul 14, 2026 · Updated Jul 14, 2026
Deserialization of untrusted data in Microsoft Windows WwanSvc allows local users to elevate privileges via local vectors. Microsoft identifies the Wireless Wide Area Network Service as the locus but has not disclosed the serialized input, parser, or unsafe operation. Low-privileged local access is required, and successful exploitation raises the attacker's privileges on the affected host.
Summary
What happened
Deserialization of untrusted data in Microsoft Windows WwanSvc allows local users to elevate privileges via local vectors. Microsoft identifies the Wireless Wide Area Network Service as the locus but has not disclosed the serialized input, parser, or unsafe operation. Low-privileged local access is required, and successful exploitation raises the attacker's privileges on the affected host.
The record
- CVE
- CVE-2026-50509
- Published
- Jul 14, 2026
- Updated
- Jul 14, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2019
- Classifications
- CWE-502, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 14, 2026CVE publishedPublication date reported by the CVE source.
- Jul 14, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=10.0.17763.0 <10.0.17763.9020
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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