CVE-2020-8923Network attack vector

Cross-site scripting via clobbered DOM sibling references

Published Mar 26, 2020 · Updated Aug 4, 2024

Cross-site scripting in Google Dart SDK stable 2.7.1 and earlier and dev 2.8.0-dev.16.0 allows remote attackers to inject script. The dart:html NodeValidator used by Element.html and related HTML-insertion APIs trusts clobberable previousNode or previousSibling DOM references, letting crafted input bypass sanitization. Applications built with an affected SDK are exposed when attacker-controlled HTML reaches those APIs and a user renders the resulting content, enabling script execution in the application origin.

CVSS severity5.4
Medium
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Google Dart SDK stable 2.7.1 and earlier and dev 2.8.0-dev.16.0 allows remote attackers to inject script. The dart:html NodeValidator used by Element.html and related HTML-insertion APIs trusts clobberable previousNode or previousSibling DOM references, letting crafted input bypass sanitization. Applications built with an affected SDK are exposed when attacker-controlled HTML reaches those APIs and a user renders the resulting content, enabling script execution in the application origin.

The record

CVE
CVE-2020-8923
Published
Mar 26, 2020
Updated
Aug 4, 2024
Vendor
Google
Product
Dart SDK
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 26, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=dev <=2.8.0-dev.16.0
  2. Affected versionversion=stable <=2.7.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Google · Dart SDKversion=dev <=2.8.0-dev.16.0; version=stable <=2.7.1

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
5.4Google Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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