CVE-2026-65898

⚠️ high

Summary

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 Score

7.2

High

EPSS Score

0.2

Exploit Probability

Published Date

2026-07-23

First Seen: 2026-07-31

📊 Relative Risk Intelligence

This CVE is Moderate Risk - more severe than 55.1% of all 340,405 vulnerabilities in our database.

#152,966

Above average severity

Severity Percentile

🎯 CISA SSVC Assessment Updated: Jul 23, 2026

🔍 Exploitation Status

None

No known exploits

⚙️ Automatable

Requires human interaction

💥 Technical Impact

Partial

Limited system impact

🏆 Discovered By

trace37labs

SSVC data provided by CISA

Last Modified 2026-07-28

Source NVD 🔗

CVSS Vector 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

CVSS Vector 4.0

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CWE IDs (Weakness Types)

CWE-79

📦 Affected Products 1

Vendor	Product	Status	Affected Versions
cure53	dompurify	Affected	< 3.4.11

🔗 References 2

https://github.com/cure53/DOMPurify/security/advisor...

Exploit Third Party Advisory

https://www.vulncheck.com/advisories/dompurify-befor...

Third Party Advisory

🔗 Related CVEs 6

CVE ID	Severity	CVSS	EPSS	Summary	Published
CVE-2026-65899	🔶 medium	6.1	0.2	DOMPurify 3.0.0 before 3.4.9 does not reset the retained Trusted Types policy when clearConfig() is called, so a DOMPuri...	2026-07-23
CVE-2026-65900	🔶 medium	6.1	0.2	DOMPurify versions >=3.0.0 and before 3.4.8, when configured with SAFE_FOR_TEMPLATES together with a DOM output mode (RE...	2026-07-23
CVE-2026-65901	🔶 medium	6.1	0.2	DOMPurify through 3.4.6 contains a cross-site scripting vulnerability in IN_PLACE mode that trusts attacker-controlled n...	2026-07-23
CVE-2026-65902	🔶 medium	6.1	0.2	DOMPurify before 3.4.7 (affected versions <= 3.4.5) passes direct references to the module-level DEFAULT_ALLOWED_TAGS an...	2026-07-23
CVE-2026-65903	🔶 medium	6.1	0.2	DOMPurify before 3.4.0 contains a logic error in the ADD_TAGS function where short-circuit evaluation allows forbidden t...	2026-07-23
CVE-2026-65904	🔶 medium	4.7	0.2	DOMPurify through 3.3.3 fails to sanitize DOM elements passed via IN_PLACE mode when the element originates from a diffe...	2026-07-23

These CVEs affect the same products