CVE•Published 2026-02-10•1 article on news•6 live references•NVD data
CVE-2026-21523
Vulnerability data via CVEDB (Shodan)
CVSS v3.1
8.0
HIGH
EPSS percentile
52
Exploit Prediction Scoring System · top 48% of all CVEs
Description
Time-of-check time-of-use (toctou) race condition in GitHub Copilot and Visual Studio allows an authorized attacker to execute code over a network.
Timeline
Published 2026-02-10
External references
Search for exposed instances
Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).
Shodan · vuln tag0 hosts
vuln:CVE-2026-21523Hosts Shodan has explicitly fingerprinted as vulnerable.
Shodan · product + version
product:"Microsoft Visual Studio Code" version:"1.100.0"Version-pinned fingerprint from NVD's first vulnerable CPE.
Shodan · banner/body mention
http.html:"Visual Studio Code"HTTP body or banner mentions "Visual Studio Code" — catches deploys Shodan didn't identify as a product.
More intel sources (5)
Shodan report
vuln:CVE-2026-21523Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2026-21523Censys host search filtered to this CVE id.
grep.app
CVE-2026-21523Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2026-21523GitHub code search for direct mentions.
Google dork
"CVE-2026-21523" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.