CVE-2026-119903 — Microsoft
HIGHCVE-2026-119903 is a high-severity (CVSS 7.8) Path Traversal vulnerability. The records list no fixed version yet; check the vendor advisory below and apply the mitigations in the meantime.
Improper access control in Windows Installer allows an authorized attacker to elevate privileges locally.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
Where this sits among everything scored
Description
Improper access control in Windows Installer allows an authorized attacker to elevate privileges locally.
Detection & mitigation playbook
VulnerabilityDetect
Identify every host running the affected component and compare the installed build against the fixed version below — for source-built or distro-packaged software the version string, not a lockfile, is the source of truth (`dpkg -l`, `rpm -q`, or the binary's own `--version`).
Remediation status
The records we use list no fixed release for CVE-2026-119903. Check the upstream advisory for a patched version, and apply the exposure-reduction steps below in the meantime.
Mitigate without a patch
Resolve every user-supplied path to its canonical form and reject anything that escapes the intended directory, and run the component under an account that has no read or write access outside the directory it legitimately serves.
Frequently Asked Questions
Is CVE-2026-119903 in your dependencies?
Find it across your dependency tree, including transitive dependencies.