CVE-2021-22540
XSS in Dart SDK
MEDIUM
6.1
CVSS Score
Published: April 22, 2021 at 02:15 PM UTC
Updated: June 17, 2026 at 03:37 AM UTC
1 product affected across 1 vendorDart Software Development Kit
Using Dart SDK by Google LLC?
Get instant alerts when new vulnerabilities affect Dart SDK - before attackers find them.
Real-time alertsTrack your software stackFree plan available
Severity
MEDIUM6.1
Exploit prediction
EPSS 0.7%
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.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
Affected range stops below 2.12.3, so it looks safe — our inference, not a vendor statement
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
References (2)
x_refsource_CONFIRMPatchThird Party Advisory
Source: [email protected]
https://github.com/dart-lang/sdk/commit/ce5a1c2392debce967415d4c09359ff2555e3588x_refsource_CONFIRMBroken Link
Source: [email protected]
https://github.com/dart-lang/sdk/security/advisories/GHSA-3rfv-4jvg-9522CVSS
- Attack Vector
- NETWORK
- Complexity
- LOW
- Privileges
- NONE
- User Interaction
- REQUIRED
- Scope
- CHANGED
- Confidentiality
- LOW
- Integrity
- LOW
- Availability
- NONE
Vector?
Quick Info
StatusMODIFIED
CWE
CWE-79
Get alerted
Stop reading CVE feeds looking for your own stack
Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.
Free plan, no card