High 8.6Published Dec 11, 2025

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

Updated under an hour ago (Oct 28, 2026, 9:50 AM ET)

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It affects GitHub Enterprise Server. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 8.6 HIGH (v4.0, CNA)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
Weakness (CWE): CWE-79
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_P
NVD analysis: Analyzed
Record last updated: Dec 11, 2025
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

GitHub Enterprise Server github:enterprise_server (from the name)	3.19.0 not affected; from 3.18.0 through 3.18.2; fixed at 3.18.3; from 3.17.0 through 3.17.8; fixed at 3.17.9; from 3.16.0 through 3.16.11; fixed at 3.16.12; from 3.15.0 through 3.15.15; fixed at 3.15.16; from 3.14.0 through 3.14.20; fixed at 3.14.21	CNA record
github enterprise_server github:enterprise_server	before 3.14.21; from 3.15.0 before 3.15.16; from 3.16.0 before 3.16.12; from 3.17.0 before 3.17.9; from 3.18.0 before 3.18.3	NVD

References

References

https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.3	release-notes
https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.9	release-notes
https://docs.github.com/en/enterprise-server@3.16/admin/release-notes#3.16.12	release-notes
https://docs.github.com/en/enterprise-server@3.15/admin/release-notes#3.15.16	release-notes
https://docs.github.com/en/enterprise-server@3.14/admin/release-notes#3.14.21	release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.