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CRITICAL

CVE-2026-77177

CVSS v3

9.8

CRITICAL

EPSS Score

0.6 %

exploit probability, as of 2026-09-30

CISA KEV

No

known exploited

Exploitation

—

SSVC status

Description

Open GenAI Stack (aka ogx-ai) 2026-06-11, as used in the Meta AI backend for WhatsApp and other products, allows code execution because prompt injection (with Jinja2 template syntax) can be used to achieve server-side expression evaluation without sanitization.

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2026-09-29
Last Modified
2026-09-29

Frequently asked questions

What is CVE-2026-77177?

Open GenAI Stack (aka ogx-ai) 2026-06-11, as used in the Meta AI backend for WhatsApp and other products, allows code execution because prompt injection (with Jinja2 template syntax) can be used to achieve server-side expression evaluation without sanitization.

Is CVE-2026-77177 actively exploited?

Active exploitation of CVE-2026-77177 has not been confirmed. Its EPSS score was 0.6% on 2026-09-30, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-77177?

CVE-2026-77177 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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