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CVE-2026-65898

Cure53 Dompurify cross-site scripting (XSS)

7.2 HIGHPublic exploitEPSS 0.30%
  1. Published23 Jul 2026

Description

DOMPurify before 3.4.11 fails to clone the ALLOWED_ATTR allowlist when setConfig() is used with an uponSanitizeAttribute hook, allowing the hook to permanently mutate the shared allowlist. Attackers can register a hook that conditionally allows dangerous attributes like onerror for trusted elements, then submit untrusted content that inherits the polluted allowlist and executes event handlers as stored XSS.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeChanged
ConfidentialityLow
IntegrityLow
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

Affected products

Cure53 Dompurify< 3.4.11

Remediation

Fixed in
Cure53 Dompurify≥ 3.4.11

References

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Frequently asked

Is CVE-2026-65898 being actively exploited?

CVE-2026-65898 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.30%.

How severe is CVE-2026-65898?

CVE-2026-65898 has a CVSS 3.1 base score of 7.2, rated high. EPSS estimates a 0.30% probability of exploitation.

Which products are affected by CVE-2026-65898?

Affected products include Cure53 Dompurify.

How do I fix CVE-2026-65898?

Upgrade affected software to a fixed version, for example Cure53 Dompurify 3.4.11 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-65898 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.