CVE-2020-8923 | XSS in Dart

An improper HTML sanitization in Dart versions up to and including 2.7.1 and dev versions 2.8.0-dev.16.0, allows an attacker leveraging DOM Clobbering techniques to skip the sanitization and inject custom html/javascript (XSS). Mitigation: update your Dart SDK to 2.7.2, and 2.8.0-dev.17.0 for the dev version. If you cannot update, we recommend you review the way you use the affected APIs, and pay special attention to cases where user-provided data is used to populate DOM nodes. Consider using Element.innerText or Node.text to populate DOM elements.

Published: 2020-03-26 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-8923 is rated Low Risk (25.8/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.04%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2020-8923

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-04-12 0.08% 0.04% -0.04%
2 2023-03-07 0.89% 0.08% -0.81%
3 2022-04-01 — 0.89% —

Full EPSS history (6 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-8923

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.4 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 2.8 2.5 [email protected]
6.1 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 2.8 2.7 [email protected]
4.3 2.0 MEDIUM
AV:N/AC:M/Au:N/C:N/I:P/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:N)
No availability impact.
 8.6 2.9 [email protected]

Weakness enumeration for CVE-2020-8923

Affected software / configurations for CVE-2020-8923

Vendor Product Version Raw CPE
dart dart_software_development_kit < 2.7.2 cpe:2.3:a:dart:dart_software_development_kit:*:*:*:*:*:*:*:*
dart dart_software_development_kit 2.8.0 cpe:2.3:a:dart:dart_software_development_kit:2.8.0:dev0.0:*:*:*:*:*:*
dart dart_software_development_kit 2.8.0 cpe:2.3:a:dart:dart_software_development_kit:2.8.0:dev1.0:*:*:*:*:*:*
dart dart_software_development_kit 2.8.0 cpe:2.3:a:dart:dart_software_development_kit:2.8.0:dev10.0:*:*:*:*:*:*
dart dart_software_development_kit 2.8.0 cpe:2.3:a:dart:dart_software_development_kit:2.8.0:dev11.0:*:*:*:*:*:*
dart dart_software_development_kit 2.8.0 cpe:2.3:a:dart:dart_software_development_kit:2.8.0:dev12.0:*:*:*:*:*:*
dart dart_software_development_kit 2.8.0 cpe:2.3:a:dart:dart_software_development_kit:2.8.0:dev13.0:*:*:*:*:*:*
dart dart_software_development_kit 2.8.0 cpe:2.3:a:dart:dart_software_development_kit:2.8.0:dev14.0:*:*:*:*:*:*
dart dart_software_development_kit 2.8.0 cpe:2.3:a:dart:dart_software_development_kit:2.8.0:dev15.0:*:*:*:*:*:*
dart dart_software_development_kit 2.8.0 cpe:2.3:a:dart:dart_software_development_kit:2.8.0:dev16.0:*:*:*:*:*:*
dart dart_software_development_kit 2.8.0 cpe:2.3:a:dart:dart_software_development_kit:2.8.0:dev2.0:*:*:*:*:*:*
dart dart_software_development_kit 2.8.0 cpe:2.3:a:dart:dart_software_development_kit:2.8.0:dev3.0:*:*:*:*:*:*
dart dart_software_development_kit 2.8.0 cpe:2.3:a:dart:dart_software_development_kit:2.8.0:dev4.0:*:*:*:*:*:*
dart dart_software_development_kit 2.8.0 cpe:2.3:a:dart:dart_software_development_kit:2.8.0:dev5.0:*:*:*:*:*:*
dart dart_software_development_kit 2.8.0 cpe:2.3:a:dart:dart_software_development_kit:2.8.0:dev6.0:*:*:*:*:*:*
dart dart_software_development_kit 2.8.0 cpe:2.3:a:dart:dart_software_development_kit:2.8.0:dev7.0:*:*:*:*:*:*
dart dart_software_development_kit 2.8.0 cpe:2.3:a:dart:dart_software_development_kit:2.8.0:dev8.0:*:*:*:*:*:*
dart dart_software_development_kit 2.8.0 cpe:2.3:a:dart:dart_software_development_kit:2.8.0:dev9.0:*:*:*:*:*:*

References for CVE-2020-8923

cvelogic Threat Intelligence