Local privilege escalation via ci.dll out-of-bounds read
Published Jul 14, 2026 · Updated Jul 14, 2026
Out-of-bounds read in ci.dll across affected Microsoft Windows releases allows local users to gain elevated privileges on the host. Code Integrity accesses a resource through an incompatible type and reads past its valid boundary, but Microsoft has not disclosed the vulnerable function or attacker-controlled input. Low-privilege local access and conditions beyond the attacker's control are required; success elevates the attacker's privileges within the operating system.
Summary
What happened
Out-of-bounds read in ci.dll across affected Microsoft Windows releases allows local users to gain elevated privileges on the host. Code Integrity accesses a resource through an incompatible type and reads past its valid boundary, but Microsoft has not disclosed the vulnerable function or attacker-controlled input. Low-privilege local access and conditions beyond the attacker's control are required; success elevates the attacker's privileges within the operating system.
The record
- CVE
- CVE-2026-50491
- Published
- Jul 14, 2026
- Updated
- Jul 14, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2019
- Classifications
- CWE-125, CWE-843, 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.
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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