CVE-2025-14046
Insufficient HTML Sanitization Allows User-Controlled DOM Elements to Overwrite Server-Initialized Data Islands and Trigger Unintended Server-Side POST Requests
- State
- Published
- Severity
- 8.6 High
- Published
- Dec 11, 2025
- Updated
- Dec 11, 2025
- Reserved
- Dec 4, 2025
Description
An improper neutralization of input vulnerability was identified in GitHub Enterprise Server that allowed user-supplied HTML to inject DOM elements with IDs that collided with server-initialized data islands. These collisions could overwrite or shadow critical application state objects used by certain Project views, leading to unintended server-side POST requests or other unauthorized backend interactions. Successful exploitation requires an attacker to have access to the target GitHub Enterprise Server instance and to entice a privileged user to view crafted malicious content that includes conflicting HTML elements. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.18.3, 3.17.9, 3.16.12, 3.15.16, and 3.14.21.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.6 High | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N | GitHub_P |
Weaknesses
- CWE-79 Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting')
Affected Products
| Product | Versions |
|---|---|
Enterprise ServerGitHub |
|
References
- https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.3
- https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.9
- https://docs.github.com/en/enterprise-server@3.16/admin/release-notes#3.16.12
- https://docs.github.com/en/enterprise-server@3.15/admin/release-notes#3.15.16
- https://docs.github.com/en/enterprise-server@3.14/admin/release-notes#3.14.21
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