CVE-2026-21518: microsoft microsoft visual studio code copilot chat extension Command Injection
CVSS: 8.8v3.1HighModified
Published 10-02-2026Last modified 19-08-2026
Vulnerability summary
CVE-2026-21518 is a high (CVSS 8.8) Command Injection vulnerability in microsoft microsoft visual studio code copilot chat extension. EPSS estimates a 1.46% chance of exploitation in the next 30 days, higher than 73.2% of scored vulnerabilities.
CVSS score
8.8/10
010
High · v3.1 (CVE.org)EPSS score
1.46%
0%100%
Low · +0.05 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Timeline
- 10-02-2026PublishedVulnerability first disclosed.
- 19-08-2026Last modifiedVulnerability information updated.
Description
Improper neutralization of special elements used in a command ('command injection') in GitHub Copilot and Visual Studio Code allows an unauthorized attacker to bypass a security feature over a network.
CVSS metrics
2 scores · 2 sources · 1 versionHigh 8.8Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:CSourcesAll 2 agree
- NVDNIST8.8HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS trend
Probability
1.46%
Chance of exploitation in the next 30 days
Percentile
73%
Versus all other CVEs
30-day change
+0.05 pp
From 1.41% on 19-09-2026
19-09-202619-10-2026
EPSS score1.46%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Microsoft2 products
- microsoft visual studio code copilot chat extension≥ 0.27.0, < 0.37.1
- visual studio code≥ 1.0.0, < 1.110.1 | < 1.109.2
1 vendor · 2 products
