Cypht before 2.12.2 contains a PHP object injection vulnerability that allows authenticated attackers to execute arbitrary operating system commands by supplying a crafted PHP object graph in the back_query GET parameter of the logout handler. Attackers can pass a base64-encoded serialized payload through this parameter, which is decoded and passed directly to unserialize() without an allow-list, signature check, or type restriction, enabling gadget-chain exploitation to achieve remote code execution as the web server process.
History

Wed, 02 Sep 2026 17:30:00 +0000

Type Values Removed Values Added
First Time appeared Cypht-org
Cypht-org cypht
Vendors & Products Cypht-org
Cypht-org cypht

Wed, 02 Sep 2026 10:45:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Tue, 01 Sep 2026 22:00:00 +0000

Type Values Removed Values Added
Description Cypht before 2.12.2 contains a PHP object injection vulnerability that allows authenticated attackers to execute arbitrary operating system commands by supplying a crafted PHP object graph in the back_query GET parameter of the logout handler. Attackers can pass a base64-encoded serialized payload through this parameter, which is decoded and passed directly to unserialize() without an allow-list, signature check, or type restriction, enabling gadget-chain exploitation to achieve remote code execution as the web server process.
Title Cypht < 2.12.2 PHP Object Injection RCE via back_query Parameter
Weaknesses CWE-502
References
Metrics cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 8.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published: 2026-09-01T20:43:08.844Z

Updated: 2026-09-02T14:52:48.434Z

Reserved: 2026-08-08T16:43:04.179Z

Link: CVE-2026-71981

cve-icon Vulnrichment

Updated: 2026-09-02T14:52:45.446Z

cve-icon NVD

Status : Deferred

Published: 2026-09-01T21:18:36.310

Modified: 2026-09-08T20:18:59.270

Link: CVE-2026-71981

cve-icon Redhat

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