CVE-2020-5258

Prototype pollution in dojo

In affected versions of dojo (NPM package), the deepCopy method is vulnerable to Prototype Pollution.

Prototype Pollution refers to the ability to inject properties into existing JavaScript language construct prototypes, such as objects.
An attacker manipulates these attributes to overwrite, or pollute, a JavaScript application object prototype of the base object by injecting other values.

This has been patched in versions 1.12.8, 1.13.7, 1.14.6, 1.15.3 and 1.16.2

Untrusted input is evaluated as executable code within the application's runtime environment. Typical impact: arbitrary code execution within the application's privilege context.

CVE-2020-5258 has a CVSS score of 7.7 (High). The vector is network-reachable, low privileges required, and user interaction required. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (1.11.10, 1.12.8, 1.13.7, 1.14.6, 1.15.3, 1.16.2); upgrading removes the vulnerable code path.

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1. What is CVE-2020-5258? CVE-2020-5258 is a high-severity code injection vulnerability in dojo (npm), affecting versions < 1.11.10. It is fixed in 1.11.10, 1.12.8, 1.13.7, 1.14.6, 1.15.3, 1.16.2. Untrusted input is evaluated as executable code within the application's runtime environment.
2. How severe is CVE-2020-5258? CVE-2020-5258 has a CVSS score of 7.7 (High). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
3. Which versions of dojo are affected by CVE-2020-5258? dojo (npm) versions < 1.11.10 is affected.
4. Is there a fix for CVE-2020-5258? Yes. CVE-2020-5258 is fixed in 1.11.10, 1.12.8, 1.13.7, 1.14.6, 1.15.3, 1.16.2. Upgrade to this version or later.
5. Is CVE-2020-5258 exploitable, and should I be worried? Whether CVE-2020-5258 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
6. What actually determines whether CVE-2020-5258 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
7. How do I fix CVE-2020-5258?
   • Upgrade dojo to 1.11.10 or later
   • Upgrade dojo to 1.12.8 or later
   • Upgrade dojo to 1.13.7 or later
   • Upgrade dojo to 1.14.6 or later
   • Upgrade dojo to 1.15.3 or later
   • Upgrade dojo to 1.16.2 or later

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