CVE-2026-65911 (GCVE-0-2026-65911)
Vulnerability from cvelistv5 – Published: 2026-07-23 13:16 – Updated: 2026-07-23 13:16
VLAI
EPSS
VEX
Title
DOMPurify before 3.4.0 XSS via ADD_ATTR/ADD_TAGS State Leakage
Summary
In DOMPurify through 3.3.3, function predicates supplied via ADD_ATTR or ADD_TAGS to DOMPurify.sanitize() persist in internal state (EXTRA_ELEMENT_HANDLING) across subsequent sanitize() calls on the same instance. If a later call on the same instance provides ADD_ATTR or ADD_TAGS as an array rather than a function, the previously set function handler is neither cleared nor overwritten, so it continues to approve attacker-controlled attributes or tags. This can allow dangerous event-handler attributes or forbidden tags (bypassing FORBID_TAGS) to survive sanitization, resulting in cross-site scripting. The vendor (Cure53) considers this an edge case outside DOMPurify's threat model; the referenced advisory lists 3.4.0 as the patched version.
Severity
6.1 (Medium)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/cure53/DOMPurify/security/advi… | vendor-advisory |
| https://www.vulncheck.com/advisories/dompurify-be… | third-party-advisory |
Impacted products
Date Public
2026-04-01 00:00
Credits
{
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"affected": [
{
"defaultStatus": "unaffected",
"packageURL": "pkg:npm/dompurify",
"product": "DOMPurify",
"vendor": "cure53",
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"status": "affected",
"version": "0",
"versionType": "semver"
},
{
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"version": "3.4.0",
"versionType": "semver"
}
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}
],
"metrics": [
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"Recovery": "NOT_DEFINED",
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"scope": "CHANGED",
"userInteraction": "REQUIRED",
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"version": "3.1"
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"problemTypes": [
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"descriptions": [
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"description": "Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
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"shortName": "VulnCheck"
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"name": "GitHub Security Advisory (GHSA-9p3w-6h5p-cv75)",
"tags": [
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],
"url": "https://github.com/cure53/DOMPurify/security/advisories/GHSA-9p3w-6h5p-cv75"
},
{
"name": "VulnCheck Advisory: DOMPurify before 3.4.0 XSS via ADD_ATTR/ADD_TAGS State Leakage",
"tags": [
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],
"url": "https://www.vulncheck.com/advisories/dompurify-before-xss-via-add-attr-add-tags-state-leakage"
}
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"title": "DOMPurify before 3.4.0 XSS via ADD_ATTR/ADD_TAGS State Leakage",
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"datePublished": "2026-07-23T13:16:22.748Z",
"dateReserved": "2026-07-23T12:51:09.595Z",
"dateUpdated": "2026-07-23T13:16:22.748Z",
"state": "PUBLISHED"
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}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
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