RCE in Github Enterprise Server
CVE-2026-4821
An improper neutralization of special elements vulnerability was identified in GitHub Enterprise Server that allowed an authenticated Management Console administrator to execute arbitrary OS commands via shell metacharacter injection in pr…
Vulnerability class: Command Injection (OS Command Injection)
EPSS: 0.000 (3.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Github Enterprise Server — versions 3.20.0, 3.19.0, 3.18.0
- Github Enterprise_server — versions 3.20.0
Weakness classification (CWE)
References
- product-cna@github.com (Release Notes, Vendor Advisory)
- product-cna@github.com (Release Notes, Vendor Advisory)
- product-cna@github.com (Release Notes, Vendor Advisory)
- product-cna@github.com (Release Notes, Vendor Advisory)
- product-cna@github.com (Release Notes, Vendor Advisory)
- product-cna@github.com (Release Notes, Vendor Advisory)
- product-cna@github.com (Release Notes, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-4821?
- CVE-2026-4821 is a high-severity vulnerability in Github Enterprise Server, classified under OS Command Injection. CVSS score: 7.2/10. Published 2026-04-21.
- How severe is CVE-2026-4821?
- High severity. CVSS v3 base score is 7.2 out of 10.