CVE-2026-66010

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Source
https://cve.org/CVERecord?id=CVE-2026-66010
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-66010.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-66010
Aliases
Downstream
Published
2026-07-24T12:07:57.374Z
Modified
2026-08-12T03:51:08.903946641Z
Severity
  • 5.1 (Medium) CVSS_V4 - 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 CVSS Calculator
Summary
DOMPurify before 3.4.12 Hook Bypass via CUSTOM_ELEMENT_HANDLING
Details

DOMPurify before 3.4.12 fails to execute afterSanitizeElements hook for custom elements allowed via CUSTOMELEMENTHANDLING.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.

Database specific 
{
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
        "CWE-79"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/66xxx/CVE-2026-66010.json"
}
References

Affected packages

Git / github.com/cure53/dompurify

Affected ranges

Type
GIT
Repo
https://github.com/cure53/dompurify
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
a9ca1e537422319a557a9a2aa61f003b23b4a197
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "3.4.12"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "CPE_RANGE"
    ],
    "cpe": "cpe:2.3:a:cure53:dompurify:*:*:*:*:*:*:*:*"
}

Affected versions

0.*
0.1
0.3
0.4
0.4.2
0.4.3
0.4.4
0.4.5
0.6.0
0.6.1
0.6.2
0.6.3
0.6.4
0.6.5
0.6.6
0.6.7
0.7.0
0.7.1
0.7.2
0.7.3
0.8.0
0.8.1
0.8.2
0.8.3
0.8.4
0.8.5
0.8.6
0.8.7
0.8.8
0.8.9
0.9.0
1.*
1.0.0
1.0.1
1.0.10
1.0.11
1.0.2
1.0.3
1.0.4
1.0.5
1.0.6
1.0.7
1.0.8
1.0.9
2.*
2.0.0
2.0.1
2.0.10
2.0.11
2.0.12
2.0.13
2.0.14
2.0.15
2.0.16
2.0.17
2.0.2
2.0.3
2.0.4
2.0.5
2.0.6
2.0.8
2.0.9
2.1.0
2.1.1
2.2.0
2.2.2
2.2.3
2.2.4
2.2.6
2.2.7
2.2.8
2.2.9
2.3.0
2.3.1
2.3.10
2.3.11
2.3.12
2.3.2
2.3.3
2.3.4
2.3.5
2.3.6
2.3.8
2.3.9
2.4.0
2.4.1
2.4.2
2.4.3
3.*
3.0.4
3.1.3
3.2.3
3.3.3
3.4.0
3.4.1
3.4.10
3.4.11
3.4.2
3.4.3
3.4.4
3.4.5
3.4.6
3.4.7
3.4.8
3.4.9
v0.*
v0.3

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-66010.json"