Staging Environment: Content and features may be unstable or change without notice.
Advisory details: gitlab / nuget/UmbracoCms.Core/CVE-2020-5809
Advisory ID gitlab/nuget/UmbracoCms.Core/CVE-2020-5809
Aliases CVE-2020-5809
GHSA-95qr-67rx-9pgh
Summary Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') A stored XSS vulnerability exists in Umbraco CMS <= 8.9.1 or current. An authenticated user can inject arbitrary JavaScript code into iframes when editing content using the TinyMCE rich-text editor, as TinyMCE is configured to allow iframes by default in Umbraco CMS.
Status Published
Exploitability 0.5
Weighted Severity 0.0
Risk
Affected and Fixed Packages Package Details
Introduced and Fixed Package Commit Patches Package Commit Patches Details
Weaknesses (3)
CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
cvssv2 https://gitlab.com/gitlab-org/advisories-community/-/blob/main/nuget/UmbracoCms.Core/CVE-2020-5809.yml
cvssv3.1 https://gitlab.com/gitlab-org/advisories-community/-/blob/main/nuget/UmbracoCms.Core/CVE-2020-5809.yml
Reference id Reference type URL
https://www.tenable.com/security/research/tra-2020-59
CVE-2020-5809 https://nvd.nist.gov/vuln/detail/CVE-2020-5809
GHSA-95qr-67rx-9pgh https://github.com/advisories/GHSA-95qr-67rx-9pgh
No exploits are available.

No EPSS data available for this advisory.

Patch URL
There are no known patches.
Vector: AV:N/AC:M/Au:S/C:N/I:P/A:N Found at https://gitlab.com/gitlab-org/advisories-community/-/blob/main/nuget/UmbracoCms.Core/CVE-2020-5809.yml
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N Found at https://gitlab.com/gitlab-org/advisories-community/-/blob/main/nuget/UmbracoCms.Core/CVE-2020-5809.yml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none

There are no SSVC decisions available.