CVE-2026-83523 — Windows 11 24h2
HIGHCVE-2026-83523 is a high-severity (CVSS 8.8) CWE-122 vulnerability in microsoft windows 11 24h2. A fix is available — see the affected versions and patch details below.
Heap-based buffer overflow in Windows Image Acquisition allows an unauthorized attacker to execute code over a network.
Exploitation Status
No confirmed exploitation observed yet
- A successful exploit gives an attacker total control of the affected component, not partial access.
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for CVE-2026-83523.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
CVE-2026-83523 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.
Where this sits among everything scored
Of 396,966 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.
Description
Heap-based buffer overflow in Windows Image Acquisition allows an unauthorized attacker to execute code over a network.
Affected Products
windows 11 24h2microsoftwindows 11 25h2microsoftwindows 11 26h1microsoftwindows 11 26h2microsoftwindows server 2025microsoftDetection & mitigation playbook
Vendor / applianceDetect
Inventory every microsoft windows 11 24h2 deployment and check each version against the affected-products list above.
Fix
Apply the microsoft windows 11 24h2 security patch or hotfix for CVE-2026-83523 on the affected version, following the vendor advisory for your exact build.
Workarounds
Stop feeding it untrusted input: reject or quarantine files and payloads from unverified sources until you can upgrade, restrict accepted formats to the ones you actually need, and run the parsing or decoding step in a least-privileged sandbox or short-lived worker so a crash or corrupted read cannot reach the rest of the process. Alongside that, restrict the management interface to trusted networks and apply the vendor's recommended configuration mitigations.
Frequently Asked Questions
Is CVE-2026-83523 being exploited in your environment?
Detect and block the exploit chain at execution, on systems you cannot patch yet.