Prototype Pollution in Jodit Editor

Executive Summary

The vulnerability in Jodit Editor versions prior to 4.12.26 is a Prototype Pollution issue. It occurs through the function Jodit.modules.Helpers.set(chain, value, obj), which processes a dot-separated chain to set values on an object. This function does not filter out keys that can mutate the prototype, such as __proto__, constructor, or prototype. If an attacker can control or partially control the key path passed to this function, they can modify Object.prototype, leading to unexpected property injection.

This can cause various problems including logic bypass, denial of service, or other secondary security issues. The vulnerability was fixed in version 4.12.26.

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Detection Guidance

This vulnerability can be detected by checking if your system is running a vulnerable version of the Jodit Editor, specifically any version prior to 4.12.26.

To detect exploitation attempts or presence of prototype pollution, you can look for unusual or unexpected properties on Object.prototype, such as a property named 'polluted' or other injected keys.

Since the vulnerability involves the use of the `Jodit.modules.Helpers.set()` function with prototype-mutating keys, monitoring application logs or network traffic for suspicious input chains containing '__proto__', 'constructor', or 'prototype' can help identify attempts to exploit this issue.

No specific commands are provided in the available resources, but general detection steps include:

• Check the version of Jodit Editor in use to ensure it is 4.12.26 or later.
• Inspect JavaScript runtime objects for unexpected properties on Object.prototype, for example by running in a browser console or Node.js environment: `Object.prototype.polluted`.
• Review application logs or network requests for input containing prototype-mutating keys such as '__proto__', 'constructor', or 'prototype'.

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Impact Analysis

This vulnerability can impact you by allowing an attacker to inject or modify properties on Object.prototype, which can lead to unexpected behavior in your application.

• Unexpected property injection
• Logic bypass
• Denial of service
• Secondary security issues resulting from prototype pollution

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Compliance Impact

The provided information does not specify any direct impact of the CVE-2026-55886 vulnerability on compliance with common standards and regulations such as GDPR or HIPAA.

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Mitigation Strategies

To mitigate this vulnerability, upgrade Jodit Editor to version 4.12.26 or later, where the Prototype Pollution issue has been fixed.

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