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Umbraco CMS Vulnerable to Stored XSS on Content Page Through Markdown Editor Preview Pane

Moderate severity GitHub Reviewed Published May 21, 2024 in umbraco/Umbraco-CMS • Updated Feb 12, 2025

Package

nuget UmbracoCms.Core (NuGet)

Affected versions

>= 8.0.0, < 8.18.13
>= 10.0.0, < 10.8.4
>= 12.0.0, < 12.3.7
>= 13.0.0, < 13.1.1

Patched versions

8.18.13
10.8.4
12.3.7
13.1.1

Description

Impact

Stored Cross-site scripting (XSS) enable attackers that have access to backoffice to bring malicious content into a website or application.

Affected versions

Umbraco CMS >= 8.00

Patches

This is fixed in 8.18.13, 10.8.4, 12.3.7, 13.1.1 by implementing IHtmlSanitizer

References

@bergmania bergmania published to umbraco/Umbraco-CMS May 21, 2024
Published by the National Vulnerability Database May 21, 2024
Published to the GitHub Advisory Database May 21, 2024
Reviewed May 21, 2024
Last updated Feb 12, 2025

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
High
Privileges required
High
User interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:N/A:N

EPSS score

Exploit Prediction Scoring System (EPSS)

This score estimates the probability of this vulnerability being exploited within the next 30 days. Data provided by FIRST.
(18th percentile)

Weaknesses

CVE ID

CVE-2024-35218

GHSA ID

GHSA-gvpc-3pj6-4m9w

Source code

Credits

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