Description

An improper neutralization of input vulnerability was identified in GitHub Enterprise Server that allowed DOM-based cross-site scripting via task list content. The task list content extraction logic did not properly re-encode browser-decoded text nodes before rendering, allowing user-supplied HTML to be injected into the page. An authenticated attacker could craft malicious task list items in issues or pull requests to execute arbitrary scripts in the context of another user's browser session. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.20 and was fixed in versions 3.18.6 and 3.19.3. This vulnerability was reported via the GitHub Bug Bounty program.

INFO

Published Date :

2026-03-10T18:55:38.673Z

Last Modified :

2026-03-11T14:15:09.704Z

Source :

GitHub_P
AFFECTED PRODUCTS

The following products are affected by CVE-2026-2266 vulnerability.

Vendors Products
Github
  • Enterprise Server
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-2266.

URL Resource
https://docs.github.com/en/[email protected]/admin/release-notes#3.18.6 cve-icon cve-icon
https://docs.github.com/en/[email protected]/admin/release-notes#3.19.3 cve-icon cve-icon
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CVSS Vulnerability Scoring System

Detailed values of each vector for above chart.
Attack Vector
Attack Complexity
Attack Requirements
Privileges Required
User Interaction
VS Confidentiality
VS Integrity
VS Availability
SS Confidentiality
SS Integrity
SS Availability
Detailed values of each vector for above chart.
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact