CVE-2021-22540 XSS in Dart SDK
An attacker can execute arbitrary scripts via DOM clobbering in Dart SDK applications due to improper sanitization of template tags.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2021-22540?
CVE-2021-22540 is a medium-severity cross-site scripting vulnerability in Google LLC Dart SDK, published on 22 Apr 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Bad validation logic in the Dart SDK versions prior to 2.12.3 allow an attacker to use an XSS attack via DOM clobbering. The validation logic in dart:html for creating DOM nodes from text did not sanitize properly when it came across template tags.
Weakness: CWE-79
Which versions are affected by CVE-2021-22540?
It affects 1 product.
Products include Dart Dart Software Development Kit.
How do I fix CVE-2021-22540?
No fix has been published for CVE-2021-22540 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2021-22540 being exploited?
There is no known exploitation of CVE-2021-22540 in the wild and no public exploit code.
Other vulnerabilities in Google LLC Dart SDK
- CVE-2022-3095 Incorrect parsing of the backslash characters in Dart library
- CVE-2021-22568 Dart - Publishing to third-party package repositories may expose pub.dev credentials
- CVE-2026-27704 Dart SDK and Flutter SDK have Zip slip in Dart Pub package extraction
- CVE-2022-0451 Auth bypass in Dark SDK
- CVE-2020-8923 XSS in Dart
Sources
Also known as GHSA-36mh-f84c-9fqq, GHSA-3rfv-4jvg-9522.