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CVE mentions, exploit signals, and PoC evidence in one fast public view.

CVE detail

CVE-2026-21523

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.

CVSS 8.0 · HighBuzz score 17.5

Buzz score

Why this CVE is surfacing

Buzz score total 17.5

This all-time snapshot uses the same composite formula as Trending across a 30-year evidence window, rather than a current rolling window.

Buzz score components · mention 11.0 · diversity 6.5 · KEV 0.0 · OTX 0.0 · PoC 0.0
Mention score
11.0
2 evidence mentions in the snapshot
Diversity score
6.5
2 sources across 1 categories
KEV score
0.0
No KEV entry observed
OTX score
0.0
0 OTX pulses
PoC score
0.0
0 repos · best confidence N/A
Best PoC traction
0
Maximum stars on a matched PoC repo

Why it matters now

Mention timeline

Total mentions
0
within the 30d window
Peak daily
0
highest bucket

Evidence

Source links by recency

Newest mentions first
2 source links · newest first
  • CVE-2026-21523 GitHub Copilot and Visual Studio Code Remote Code Execution VulnerabilityMicrosoft MSRC

    Added acknowledgements. This is an informational change only.

    vendormsrc.microsoft.comApr 20, 2026, 2:00 PM
  • The February 2026 Security Update ReviewZero Day Initiative

    ake a closer look at some of the more interesting updates for this month, starting with the bugs under active attack: - CVE-2026-21510 - Windows Shell Security Feature Bypass Vulnerability This bug is listed as a security feature bypass, but it could also be classified as code execution. An attacker can bypass Windows SmartScreen and Windows Shell secu

    vendorwww.thezdi.comFeb 10, 2026, 6:30 PM

Exploit code

Public exploit repository references

Public PoC repositories are third-party, potentially unsafe artifacts. Treat their code as untrusted and use it only on authorized systems in an isolated, least-privilege environment. cvebuzz does not execute the code or verify that an exploit works.

0 repository references · best confidence N/A · max 0 stars
No public PoC repositories have been matched yet.

Related records

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