Baitaphish
Security intelligence
SearchLatest briefing
CVE Explorer

CVE-2026-66010

DOMPurify before 3.4.12 fails to execute afterSanitizeElements hook for custom elements allowed via CUSTOM_ELEMENT_HANDLING.tagNameCheck, allowing attributes to bypass application security policies. Attackers can preserve sensitive attributes on custom elements that later re-inject them into innerHTML sinks, creating second-order XSS gadgets.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:ac37bb33c6888b62888fd16288226f8701f95260b4cf8f1d38ac4019cce591ea
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cvss · 2 assertions

{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":6.1,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:62143126cf4a5c14db15bc246aed5f2ffd3a1db94ecadd12a2408d4e6b60441a · sha256:2020306e1e6ae483… · /containers/cna/metrics/1/cvssV3_1

{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":5.1,"baseSeverity":"MEDIUM","exploitMaturity":"NOT_DEFINED","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"LOW","subIntegrityImpact":"LOW","userInteraction":"ACTIVE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact"…

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:62143126cf4a5c14db15bc246aed5f2ffd3a1db94ecadd12a2408d4e6b60441a · sha256:2020306e1e6ae483… · /containers/cna/metrics/0/cvssV4_0

Affected products and versions

1 source assertion
{"defaultStatus":"unaffected","packageURL":"pkg:npm/DOMPurify","product":"DOMPurify","vendor":"cure53","versions":[{"lessThan":"3.4.12","status":"affected","version":"0","versionType":"semver"},{"status":"unaffected","version":"3.4.12","versionType":"semver"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:62143126cf4a5c14db15bc246aed5f2ffd3a1db94ecadd12a2408d4e6b60441a · sha256:2020306e1e6ae483… · /containers/cna/affected/0

Provider-owned CVSS observations

2 source assertions
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":6.1,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:62143126cf4a5c14db15bc246aed5f2ffd3a1db94ecadd12a2408d4e6b60441a · sha256:2020306e1e6ae483… · /containers/cna/metrics/1/cvssV3_1
{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":5.1,"baseSeverity":"MEDIUM","exploitMaturity":"NOT_DEFINED","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"LOW","subIntegrityImpact":"LOW","userInteraction":"ACTIVE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact"…
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:62143126cf4a5c14db15bc246aed5f2ffd3a1db94ecadd12a2408d4e6b60441a · sha256:2020306e1e6ae483… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-79","description":"Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:62143126cf4a5c14db15bc246aed5f2ffd3a1db94ecadd12a2408d4e6b60441a · sha256:2020306e1e6ae483… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"tags":["exploit"],"url":"https://github.com/cure53/DOMPurify/security/advisories/GHSA-c2j3-45gr-mqc4"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:62143126cf4a5c14db15bc246aed5f2ffd3a1db94ecadd12a2408d4e6b60441a · sha256:2020306e1e6ae483… · /containers/adp/0/references/0
{"name":"GitHub Security Advisory (GHSA-c2j3-45gr-mqc4)","tags":["vendor-advisory"],"url":"https://github.com/cure53/DOMPurify/security/advisories/GHSA-c2j3-45gr-mqc4"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:62143126cf4a5c14db15bc246aed5f2ffd3a1db94ecadd12a2408d4e6b60441a · sha256:2020306e1e6ae483… · /containers/cna/references/0
{"name":"VulnCheck Advisory: DOMPurify before 3.4.12 Hook Bypass via CUSTOM_ELEMENT_HANDLING","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/dompurify-before-hook-bypass-via-custom-element-handling"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:62143126cf4a5c14db15bc246aed5f2ffd3a1db94ecadd12a2408d4e6b60441a · sha256:2020306e1e6ae483… · /containers/cna/references/1

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.

← Back to CVE Explorer