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CVE-2025-13744: Improper Neutralization of Input During Web Page Generation vulnerability was identified in GitHub Enterprise Server that allowed rendering of malicious HTML

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-01-06 · updated 2026-06-17
• Weakness: CWE-79

Description

An Improper Neutralization of Input During Web Page Generation vulnerability was identified in GitHub Enterprise Server that allowed attacker controlled HTML to be rendered by the Filter component (search) across GitHub that could be used to exfiltrate sensitive information. An attacker would require permissions to create or modify the names of milestones, issues, pull requests, or similar entities that are rendered in the vulnerable filter/search components. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.20 and was fixed in versions 3.19.1, and 3.18.2, 3.17.8, 3.16.11, 3.15.15, and 3.14.20. This vulnerability was reported via the GitHub Bug Bounty program.

Affected products

• GitHub Enterprise Server: from 3.14.0 before 3.14.20; from 3.15.0 before 3.15.15; from 3.16.0 before 3.16.11; from 3.17.0 before 3.17.8; from 3.18.0 before 3.18.2; 3.19.0 — fixed in 3.14.20, 3.15.15, 3.16.11, 3.17.8, 3.18.2

How to fix

Upgrade to a fixed version: GitHub Enterprise Server 3.14.20, 3.15.15, 3.16.11, 3.17.8. Check the vendor advisory for mitigations.

References

• https://docs.github.com/en/enterprise-server@3.14/admin/release-notes#3.14.20
• https://docs.github.com/en/enterprise-server@3.15/admin/release-notes#3.15.15
• https://docs.github.com/en/enterprise-server@3.16/admin/release-notes#3.16.11
• https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.8
• https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.2
• https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.1

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