What is the CVSS score of CVE-2026-27012?

CVE-2026-27012 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.0%.

Which versions of PHP are affected by CVE-2026-27012?

A critical vulnerability (CVSS 9.8) in OpenSTAManager allows remote attackers to achieve complete system compromise with a publicly available exploit and no vendor patch currently available.

Is there a public PoC exploit available for CVE-2026-27012?

Yes, a public proof-of-concept exploit is available for CVE-2026-27012. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2026-27012?

Within 24 hours: Identify all systems running OpenSTAManager and isolate them from production networks if possible; enable enhanced logging and monitoring for exploitation attempts. Within 7 days: Implement network segmentation to restrict OpenSTAManager access to authorized users only; deploy WAF rules to block known exploit patterns; evaluate alternative software solutions. Within 30 days: Complete migration to a patched version or alternative platform; conduct forensic analysis for signs of compromise; implement network-based intrusion detection signatures.

PHP CVE-2026-27012

CRITICAL

Missing Authentication for Critical Function (CWE-306)

2026-03-03 security-advisories@github.com

GHSA-247v-7cw6-q57v

PHP Privilege Escalation Authentication Bypass Openstamanager

9.8

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

9.8 CRITICAL

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 22:05 vuln.today

PoC Detected

Mar 05, 2026 - 18:19 vuln.today

Public exploit code

CVE Published

Mar 03, 2026 - 22:16 nvd

CRITICAL 9.8

DescriptionGitHub Advisory

OpenSTAManager is an open source management software for technical assistance and invoicing. In 2.9.8 and earlier, a 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.