CVE-2026-71981

High

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.

SeverityHigh

CVSS8.8

Exploit probability—

ProductCypht

PublishedSep 1, 2026

First seenSep 1, 2026

Weakness typeCWE-502Deserialization of untrusted data

How to fix

Update

cypht-org cypht2.12.2 or later

Patches

github.com/cypht-org/cypht/commit/e4aa2f34e33f9328e8c93514cc3966fc3d99925e

Vendor advisories

github.com/cypht-org/cypht/releases/tag/v2.12.2

Affected products

Product	Affected versions	Fixed in
cypht-org cypht	v < 2.12.2	2.12.2

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