CVE-2026-8106
Reflected HTML injection vulnerability in GitHub Enterprise Server Management Console login page allowed credential theft
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.
INFO
Published Date :
May 7, 2026, 10:16 p.m.
Last Modified :
May 11, 2026, 5:12 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 4.0 | MEDIUM | 82327ea3-741d-41e4-88f8-2cf9e791e760 | ||||
| CVSS 4.0 | MEDIUM | [email protected] |
Solution
- Update GitHub Enterprise Server to version 3.19.6 or later.
- Update GitHub Enterprise Server to version 3.20.2 or later.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-8106.
| URL | Resource |
|---|---|
| https://docs.github.com/en/[email protected]/admin/release-notes#3.19.6 | Release Notes Vendor Advisory |
| https://docs.github.com/en/[email protected]/admin/release-notes#3.20.2 | Release Notes Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-8106 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-8106
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-8106 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-8106 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
May. 11, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Added CPE Configuration OR *cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:* versions from (including) 3.19.1 up to (excluding) 3.19.6 *cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:* versions from (including) 3.20.0 up to (excluding) 3.20.2 Added Reference Type GitHub, Inc. (Products Only): https://docs.github.com/en/[email protected]/admin/release-notes#3.19.6 Types: Release Notes, Vendor Advisory Added Reference Type GitHub, Inc. (Products Only): https://docs.github.com/en/[email protected]/admin/release-notes#3.20.2 Types: Release Notes, Vendor Advisory -
New CVE Received by [email protected]
May. 07, 2026
Action Type Old Value New Value Added 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. Added CVSS V4.0 AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-79 Added Reference https://docs.github.com/en/[email protected]/admin/release-notes#3.19.6 Added Reference https://docs.github.com/en/[email protected]/admin/release-notes#3.20.2