CVE-2026-65903

DOMPurify before 3.4.0 ADD_TAGS Function Bypasses FORBID_TAGS

At a glance

Severity: MEDIUM 5.1
EPSS: EPSS 0.33 % · percentile 25 (2026-10-27)
State: PUBLISHED
Published: 2026-07-23
Updated: 2026-07-23
Assigner: VulnCheck
NVD status: Analyzed

Description

DOMPurify before 3.4.0 contains a logic error in the ADD_TAGS function where short-circuit evaluation allows forbidden tags to bypass FORBID_TAGS restrictions. Attackers can craft input containing tags listed in FORBID_TAGS that are also added via ADD_TAGS function, causing them to be retained in sanitized output.

Scores

Version	Score	Vector	Scored by
CVSS 4.0	MEDIUM 5.1	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	VulnCheck
CVSS 3.1	MEDIUM 6.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N	VulnCheck
CVSS 4.0	MEDIUM 5.1	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/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	NVD · disclosure@vulncheck.com (Secondary)
CVSS 3.1	MEDIUM 6.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N	NVD · disclosure@vulncheck.com (Secondary)

Weaknesses (CWE)

CWE-697

Advisories

GHSA-39q2-94rc-95cp — DOMPurify's ADD_TAGS function form bypasses FORBID_TAGS due to short-circuit evaluation

European references

ENISA EUVD · EUVD-2026-48272
GCVE · GCVE-0-2026-65903

CERT-FR advisories

CERTFR-2026-AVI-1256 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr
CERTFR-2026-AVI-1165 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr
CERTFR-2026-AVI-1049 — Multiples vulnérabilités dans Oracle MySQL · cert.ssi.gouv.fr

Affected configurations (NVD CPE)

cpe:2.3:a:cure53:dompurify:*:*:*:*:*:*:*:* < 3.4.0

Affected products

Product	Versions
cure53 · DOMPurify	affected 0 < 3.4.0 ; unaffected 3.4.0

References

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)	Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD