{"id":"CVE-2026-27012","aliases":["GHSA-247v-7cw6-q57v"],"url":"https://o3.security/vulnerability/CVE-2026-27012","summary":"Unauthenticated privilege escalation in OpenSTAManager via modules/utenti/actions.php","details":"### Summary\nA privilege escalation and authentication bypass vulnerability in OpenSTAManager allows any attacker to arbitrarily change a user's group (`idgruppo`) by directly calling `modules/utenti/actions.php`. This can promote an existing account (e.g. agent) into the Amministratori group as well as demote any user including existing administrators.\n\n### Details\n`modules/utenti/actions.php` is reachable directly via `http://<IP>:8080/modules/utenti/actions.php` and processes privileged information without requiring any authentication or authorization checks on fields like idgruppo. As a result, an attacker can submit a crafted POST request that updates the targets record and assigns it to the administrator group.\n\nThe file explicitly sets:\n```PHP\n$skip_permissions = true;\ninclude_once __DIR__.'/../../core.php';\n```\n`core.php` then invokes:\n\n```PHP\nPermissions::skip();\n```\nThus, disabling any authentication and permission enforcement. As a result, this file processes operations based on the `op` parameter in the POST request, not only `update_user`. Sensitive fields like `idgruppo` and others can be updated without verifying anything.\n\n### PoC\nA target username exists, such as \"agent\" with an ID of 4. No authentication or cookies are required. Send the following POST request via Burp Suite or similar:\n<img width=\"1094\" height=\"255\" alt=\"image\" src=\"https://github.com/user-attachments/assets/2e8cb148-1b5d-4e5c-9c73-05ed75d64188\" />\nThe target's group is updated in the database.\nVerify the changes in the database before and after the POST request:\n<img width=\"1053\" height=\"430\" alt=\"image\" src=\"https://github.com/user-attachments/assets/49f63ca0-8a04-4dd1-b27c-69699d2ce26f\" />\nChanges also visible in the administrator panel, they have been moved from the Agenti group to Amministratori.\n\n### Impact\nAn unauthenticated attacker can assign administrator privileges to existing users, modify group memberships, enable/disable accounts and other operations that are exposed in the file. This can lead to a full compromise of the application.","published":"2026-03-03T21:53:01.002Z","modified":"2026-10-28T02:30:59.494096250Z","cvss":{"score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"epss":{"score":0.00537,"percentile":0.4284,"asOf":"2026-08-24"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Packagist","name":"devcode-it/openstamanager","fixedVersion":null}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27012.json"},{"type":"ADVISORY","url":"https://github.com/devcode-it/openstamanager/security/advisories/GHSA-247v-7cw6-q57v"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-27012"},{"type":"PACKAGE","url":"https://github.com/devcode-it/openstamanager"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-28T02:30:59.494096250Z"}}