Quick answers
- Is This vulnerability exploited in the wild?
- No. Junglewise Threat Intelligence has no report of This vulnerability being exploited in the wild.
- How severe is This vulnerability?
- Informational severity, published 4 September 2020.
- Which products and versions are affected?
- React SEMVER:introduced=0.0.1,fixed=0.14.0.
- Is there a fix for This vulnerability?
- Yes. React: upgrade to 0.14.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is This vulnerability attacked?
- It is attacked over the network.
- Am I affected?
- Check whether you run React at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
How to fix
- React: upgrade to 0.14.0 or later
Technical details
The vulnerability is a Cross-Site Scripting (CWE-79) flaw in React's createElement function prior to version 0.14.0. The function fails to properly validate its input object, allowing attackers to craft malicious React elements containing executable JavaScript. The attack requires the ability to control the input to createElement, which could occur through user-supplied data rendered by an application. No authentication or special privileges are required to trigger the vulnerability if the application passes untrusted data to createElement. An attacker can execute arbitrary JavaScript in the victim's browser context, potentially accessing sensitive data or performing actions on behalf of the user. The vulnerability was fixed in React 0.14.0, released on October 7, 2015.
Affected products
- Facebook React before 0.14.0
Timeline
- 2020-09-04: disclosed
- 2015-10-07: patched: Fixed in React 0.14.0