Medium severity · published May 7, 2026
CVE-2026-8106
Reflected HTML injection vulnerability in GitHub Enterprise Server Management Console login page allowed credential theft
6.1
CVSS
0.2%
EPSS
No
On KEV
Description
A reflected HTML injection vulnerability was identified in the GitHub Enterprise Server Management Console login page that could allow credential theft. The redirect_to query parameter on the /setup/unlock endpoint was reflected into an HTML attribute without proper sanitization, enabling an attacker to inject a form element that could capture administrator credentials. Exploitation required an administrator to click a crafted link and enter their credentials. This vulnerability affected GitHub Enterprise Server versions 3.19.1 through 3.19.5 and 3.20.0 through 3.20.1, and was fixed in versions 3.19.6 and 3.20.2. This vulnerability was reported via the GitHub Bug Bounty program.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 6% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
ES
Enterprise Server · GitHub
3.19.1 through 3.19.5; 3.20.0 through 3.20.1 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-8106
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-8106
Release Notes
https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.6
Release Notes
https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.2
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