🛡️ CVE-2024-35218 — umbraco-cms

🟡 CVSS 4.2 — Medium ✅ No Known Exploit CWE-79 NVD
4.2
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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

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

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is high, an attacker needs administrative privileges on the target. A user must be tricked into taking some action. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity none, availability none.

Weakness class

CVE-2024-35218 is classified as CWE-79: Cross-site Scripting (XSS). User-supplied data is written into a page without escaping, so attacker script runs in the browser of anyone who views it.

Affected software

CVE-2024-35218 is recorded against 2 packages.

  • umbraco-cms (from 13.0.0 up to 13.1.1)
  • umbracocms.core (from 13.0.0 up to 13.1.1)

Timeline and source

Published on 21 May 2024 and last revised on 17 June 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

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Details

Severity MEDIUM
CVSS Score 4.2
CVSS Vector CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:N/A:N
CWE CWE-79
Public Exploit ✅ No
Source NVD
Published 2024-05-21
Updated 2026-08-12
Modified 2026-06-17

Affected Packages

Software From version Fixed in
umbraco-cms 13.0.0 13.1.1
umbracocms.core 13.0.0 13.1.1

References

Similar Threats

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