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HIGH

CVE-2026-71981

CVSS v3

8.8

HIGH

EPSS Score

1.0 %

exploit probability, as of 2026-09-28

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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 exec

Technical details

Published
2026-09-01
Last Modified
2026-09-02

Frequently asked questions

What is CVE-2026-71981?

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 exec

Is CVE-2026-71981 actively exploited?

Active exploitation of CVE-2026-71981 has not been confirmed. Its EPSS score was 1.0% on 2026-09-28, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-71981?

CVE-2026-71981 has a CVSS v3 base score of 8.8 (HIGH severity).

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