Is CVE-2026-2266 actively exploited?

No active exploitation of CVE-2026-2266 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-2266 be exploited remotely?

Yes. CVE-2026-2266 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-2266?

CVE-2026-2266 has a CVSS score of 5.4 (MEDIUM).

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MEDIUM

CVE-2026-2266

CWE-79Published: March 10, 2026· Updated: Mar 12, 2026

5.4

CVSS v3.1

EPSS:0.07%probability of exploitation in 30 daysPercentile:21.1th

Official 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.

NVD Source

Technical Analysis

CVE-2026-2266 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.

From a weakness classification perspective (CWE-79): Cross-site scripting (XSS) vulnerabilities allow attackers to inject malicious scripts into web pages viewed by other users.