Adjacent-network code execution with low privileges
Published Oct 13, 2026 · Updated Oct 13, 2026
Use-after-free in Microsoft Windows BITS allows remote authenticated users to execute code through adjacent-network access. The published record identifies BITS but does not disclose the affected function, triggering input, or operation that accesses freed memory. Microsoft's vector requires low privileges and no user interaction, contrary to the description's unauthorized-attacker wording; the execution context is not disclosed.
Summary
What happened
Use-after-free in Microsoft Windows BITS allows remote authenticated users to execute code through adjacent-network access. The published record identifies BITS but does not disclose the affected function, triggering input, or operation that accesses freed memory. Microsoft's vector requires low privileges and no user interaction, contrary to the description's unauthorized-attacker wording; the execution context is not disclosed.
The record
- CVE
- CVE-2026-88121
- Published
- Oct 13, 2026
- Updated
- Oct 13, 2026
- Vendor
- Microsoft Corporation
- Product
- Windows Server 2019
- Classifications
- CWE-416
- Attack vector
- adjacent
- Privileges
- authenticated
Timeline
How it unfolded
- Oct 13, 2026CVE publishedPublication date reported by the CVE source.
- Oct 13, 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 <10.0.17763.9376
What conditions does exploitation require?
What is affected?
Published CVSS scores
No CVSS assessment is available in this record.
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.
Activity data is delayed. The latest report is Sep 28, 2026.
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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