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Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')


Severity High
Score 8.2/10


The package matrix-react-sdk is a Matrix chat protocol SDK for React Javascript. In certain configurations, data sent by remote servers containing special strings in key locations could cause modifications of the `Object.prototype`, disrupting matrix-react-sdk functionality, causing Denial-of-service, and potentially affecting program logic. This vulnerability affects versions prior to 3.69.0. Note: this advisory is distinct from GHSA-2x9c-qwgf-94xr which refers to a similar issue.

  • LOW
  • LOW
  • NONE
  • NONE
  • NONE
  • HIGH

CWE-1321 - Prototype Pollution

Prototype pollution is one of the lesser-known vulnerabilities. It allows attackers to abuse the rules of JavaScript by injecting properties into the general object “Object” in JS. Modifying the prototype of “Object” affects the behavior of all objects in the entire app, potentially resulting in denial of service, arbitrary code execution, cross-site scripting, etc.

Advisory Timeline

  • Published