# CVE-2026-65903

## Summary

- **CVE ID:** CVE-2026-65903
- **Severity:** MEDIUM
- **CVSS Score:** 6.1 (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)
- **CWE:** CWE-697
- **Published:** Jul 23, 2026
- **Last Modified:** Jul 24, 2026

## 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.

## Affected Products

- cure53 — DOMPurify (0)
- cure53 — DOMPurify (3.4.0)

## References

- [CNA](https://github.com/cure53/DOMPurify/security/advisories/GHSA-39q2-94rc-95cp)
- [CNA](https://www.vulncheck.com/advisories/dompurify-before-add-tags-function-bypasses-forbid-tags)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.33%
- **EPSS Percentile:** 25.3

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._