CVE-2026-109476 — Microsoft
MEDIUMCVE-2026-109476 is a medium-severity (CVSS 6.1) CWE-116 vulnerability. The records list no fixed version yet; check the vendor advisory below and apply the mitigations in the meantime.
Improper encoding or escaping of output in ASP.NET Core allows an unauthorized attacker to disclose information over a network.
Description
Improper encoding or escaping of output in ASP.NET Core allows an unauthorized attacker to disclose information over a network.
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-2026-109476. Check the upstream advisory for a patched version, and apply the exposure-reduction steps below in the meantime.
Mitigate without a patch
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
Frequently Asked Questions
Is CVE-2026-109476 in your dependencies?
Find it across your dependency tree, including transitive dependencies.