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CVE-2025-66457

8.8 · HIGH

Elysia is a Typescript framework for request validation, type inference, OpenAPI documentation and client-server communication.

Published Dec 9, 2025CWE-94EPSS 0.81%

Overview

CVE-2025-66457 is a high-severity vulnerability. It was published on December 9, 2025 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

Elysia is a Typescript framework for request validation, type inference, OpenAPI documentation and client-server communication. Versions 1.4.17 and below are subject to arbitrary code execution from cookie config. When dynamic cookies are enabled (e.g. there an existing cookie schema), the cookie config is injected into the compiled route without first being sanitised. Availability of this exploit is generally low, but when combined with GHSA-hxj9-33pp-j2cc, it allows for a full RCE chain. An attack requires write access to either the Elysia app's source code (in which case the vulnerability is meaningless) or write access to the cookie config (perhaps where it is assumed to be provisioned by the environment). This issue is fixed in version 1.4.18.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/elysiajs/elysia/commit/26935bf76ebc43b4a43d48b173fc853de43bb51eGitHubgithub.com/elysiajs/elysia/commit/3af978663e437dccc6c1a2a3aff4b74e1574849eGitHubgithub.com/elysiajs/elysia/pull/1564GitHubgithub.com/elysiajs/elysia/security/advisories/GHSA-8vch-m3f4-q8jfGitHubgithub.com/elysiajs/elysia/security/advisories/GHSA-hxj9-33pp-j2ccGitHubgithub.com/sportshead/elysia-poc

How CyberStrike helps

Frequently asked questions

What is CVE-2025-66457?

CVE-2025-66457 is a high-severity vulnerability. It was published on December 9, 2025 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2025-66457?

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2025-66457?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-66457?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-66457 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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