Skip to content
Fencer Vulns
medium 4.2

CVE-2024-35218 json

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

published 2024-05-21 2 y ago modified 2026-09-10 1 mo ago also EUVD-2024-1633 , GHSA-gvpc-3pj6-4m9w

cvss
4.2
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 29%
public exploits
0
none known

Summary

Umbraco CMS is an ASP.NET CMS used by more than 730.000 websites. Stored Cross-site scripting (XSS) enable attackers that have access to backoffice to bring malicious content into a website or application. This vulnerability has been patched in version(s) 8.18.13, 10.8.4, 12.3.7, 13.1.1 by implementing IHtmlSanitizer.

Patch / fix

  • nuget UmbracoCms.Core 8.18.13, 10.8.4, 12.3.7, 13.1.1
  • umbraco umbraco_cms 8.18.13, 10.8.4, 12.3.7, 13.1.1

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 y ago

Exploit prediction

0.35% chance of exploitation in the next 30 days, higher than 29% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 4.2 CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:N/A:N
GitHub 3.1 4.2 CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:N/A:N
NVD 3.1 4.8 CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

Affected packages

ecosystem package affected fixed in
nuget UmbracoCms.Core
>=8.0.0, <8.18.13
>=10.0.0, <10.8.4
>=12.0.0, <12.3.7
>=13.0.0, <13.1.1
8.18.13
10.8.4
12.3.7
13.1.1

Affected products

  • umbraco Umbraco-CMS

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.