How severe is CVE-2024-35218?

CVE-2024-35218 has a CVSS 3.x base score of 4.2, rated medium severity. It is exploitable over network with high attack complexity, requires high privileges and user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2024-35218 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2024-35218?

CVE-2024-35218 affects Umbraco Umbraco Cms. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2024-35218?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2024-35218 have an EU (EUVD) identifier?

Yes. CVE-2024-35218 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-1633.

When was CVE-2024-35218 published?

CVE-2024-35218 was published on 2024-05-21 and last updated on 2026-06-17.

CVE-2024-35218

CVE-2024-35218 is a medium-severity vulnerability in Umbraco Umbraco Cms with a CVSS 3.x base score of 4.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 4.2)
EPSS exploit prediction: 0% (27th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2024-1633
Weakness: CWE-79
Affected product: Umbraco Umbraco Cms
Published: 2024-05-21
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2024-35218?: 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.
How severe is CVE-2024-35218?: CVE-2024-35218 has a CVSS 3.x base score of 4.2, rated medium severity. It is exploitable over network with high attack complexity, requires high privileges and user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2024-35218 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2024-35218?: CVE-2024-35218 affects Umbraco Umbraco Cms. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2024-35218?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2024-35218 have an EU (EUVD) identifier?: Yes. CVE-2024-35218 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-1633.
When was CVE-2024-35218 published?: CVE-2024-35218 was published on 2024-05-21 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:umbraco:umbraco_cms:*:*:*:*:*:*:*:*

More vulnerabilities in Umbraco Umbraco Cms

CVE-2025-67288 — Critical (CVSS 10.0): An arbitrary file upload vulnerability in Umbraco CMS v16.3.3 allows attackers to execute arbitrary code by uploading a…
CVE-2012-10054 — Critical (CVSS 9.8): Umbraco CMS versions prior to 4.7.1 are vulnerable to unauthenticated remote code execution via the codeEditorSave.asmx…
CVE-2014-10074 — Critical (CVSS 9.8): Umbraco before 7.2.0 has a remote PHP code execution vulnerability because…
CVE-2012-1301 — Critical (CVSS 9.8): The FeedProxy.aspx script in Umbraco 4.7.0 allows remote attackers to proxy requests on their behalf via the "url"…
CVE-2025-32017 — High (CVSS 8.8): Umbraco is a free and open source .NET content management system. Authenticated users to the Umbraco backoffice are…
CVE-2020-9471 — High (CVSS 8.8): Umbraco Cloud 8.5.3 allows an authenticated file upload (and consequently Remote Code Execution) via the Install…

All CVEs affecting Umbraco Umbraco Cms →

Other CWE-79 (Cross-site Scripting (XSS)) vulnerabilities

CVE-2025-49410 — Critical (CVSS 10.0): Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Imran Emu TC…
CVE-2024-47875 — Critical (CVSS 10.0): DOMPurify is a DOM-only, super-fast, uber-tolerant XSS sanitizer for HTML, MathML and SVG. DOMpurify was vulnerable to…
CVE-2024-6886 — Critical (CVSS 10.0): Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Gitea…
CVE-2023-45144 — Critical (CVSS 10.0): com.xwiki.identity-oauth:identity-oauth-ui is a package to aid in building identity and service providers based on…
CVE-2023-45138 — Critical (CVSS 10.0): Change Request is an pplication allowing users to request changes on a wiki without publishing the changes directly.…
CVE-2022-4361 — Critical (CVSS 10.0): Keycloak, an open-source identity and access management solution, has a cross-site scripting (XSS) vulnerability in the…

Browse all CWE-79 (Cross-site Scripting (XSS)) vulnerabilities →