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CVE-2024-35239

18
FAUCET Score

CVE-2024-35239 is a medium-severity cross-site scripting (XSS) vulnerability affecting Umbraco Forms, an open-source .NET web forms solution. An authenticated user with "edit Forms" access can inject unsafe code into form components, potentially leading to client-side script execution. The attack requires user interaction (UI:R) and has low impact on confidentiality and integrity (C:L/I:L). While no active exploits, public exploit code, or significant community discussion have been observed, a mitigation involving configuring TitleAndDescription:AllowUnsafeHtmlRendering is available after upgrading to patched versions.

Impacted Technologies

VendorProductVersion(s)CPE
< 8.13.13CPE matchmatch criteria
cpe:2.3:a:umbraco:umbraco_forms:*:*:*:*:*:*:*:*
>= 9.0.0, < 10.5.3CPE matchmatch criteria
cpe:2.3:a:umbraco:umbraco_forms:*:*:*:*:*:*:*:*
>= 11.0.0, < 12.2.2CPE matchmatch criteria
cpe:2.3:a:umbraco:umbraco_forms:*:*:*:*:*:*:*:*
>= 13.0.0, < 13.0.1CPE matchmatch criteria
cpe:2.3:a:umbraco:umbraco_forms:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

2.7LOW

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
1.2
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.34%
Probability of exploitation in next 30 days
EPSS Percentile
26.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-23
Model: v2026.06.15
This CVE's current EPSS score of 0.0034 is in the 39th percentile among its peer group of 15,222 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (5)

nugetpatch availablevia ghsa
Product: Umbraco.FormsFixed in: 13.0.1
nugetpatch availablevia ghsa
Product: Umbraco.FormsFixed in: 12.2.2
nugetpatch availablevia ghsa
Product: Umbraco.FormsFixed in: 10.5.3
nugetpatch availablevia ghsa
Product: Umbraco.FormsFixed in: 8.13.13
github_advisoryvendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

nugetGHSA-p572-p2rj-q5f4low

Umbraco Forms components vulnerable to Stored Cross-site Scripting

May 28, 2024

References

docs.umbraco.com / umbraco-forms/developer/configuration
Product
docs.umbraco.com / umbraco-forms/release-notes
Release Notes
docs.umbraco.com / umbraco-forms/v/10.forms.latest/release-notes
Release Notes
docs.umbraco.com / umbraco-forms/v/12.forms.latest/release-notes
Release Notes
github.com / umbraco/Umbraco.Forms.Issues/security/advisories/GHSA-p572-p2rj-q5f4
Vendor Advisory