CVE Explorer

CVE-2026-31833

Umbraco is an ASP.NET CMS. From 16.2.0 to before 16.5.1 and 17.2.2, An authenticated backoffice user with access to Settings can inject malicious HTML into property type descriptions. Due to an overly permissive attributeNameCheck configuration (/.+/) in the UFM DOMPurify instance, event handler attributes such as onclick and onload, when used within Umbraco web components (umb-*, uui-*, ufm-*) were not filtered. This vulnerability is fixed in 16.5.1 and 17.2.2.

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:562fafa0a3765348ffd6b934a37cc2e0b60961facafa81891a4a838d9cf5c3c8

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Affected products and versions

1 source assertion

{"product":"Umbraco-CMS","vendor":"umbraco","versions":[{"status":"affected","version":">= 16.2.0, < 16.5.1"},{"status":"affected","version":">= 17.0.0, < 17.2.1"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:7f0103dcb4abdafe8a1fb3cfa9b724de32a13f3908a9d08d60e9d2e9eefad46c · sha256:de5d96012ca0d953… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion

{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":6.7,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"HIGH","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:L","version":"3.1"},"metric_type":"cvssV3_1"}

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:7f0103dcb4abdafe8a1fb3cfa9b724de32a13f3908a9d08d60e9d2e9eefad46c · sha256:de5d96012ca0d953… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion

{"cweId":"CWE-79","description":"CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:7f0103dcb4abdafe8a1fb3cfa9b724de32a13f3908a9d08d60e9d2e9eefad46c · sha256:de5d96012ca0d953… · /containers/cna/problemTypes/0/descriptions/0

Source references

1 source assertion

{"name":"https://github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-vrqc-59mw-qqg7","tags":["x_refsource_CONFIRM"],"url":"https://github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-vrqc-59mw-qqg7"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:7f0103dcb4abdafe8a1fb3cfa9b724de32a13f3908a9d08d60e9d2e9eefad46c · sha256:de5d96012ca0d953… · /containers/cna/references/0

Attribution and limitations

CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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