CWE · MITRE source
CWE-86Improper Neutralization of Invalid Characters in Identifiers in Web Pages
The product does not neutralize or incorrectly neutralizes invalid characters or byte sequences in the middle of tag names, URI schemes, and other identifiers.
Some web browsers may remove these sequences, resulting in output that may have unintended control implications. For example, the product may attempt to remove a "javascript:" URI scheme, but a "java%00script:" URI may bypass this check and still be rendered as active javascript by some browsers, allowing XSS or other attacks.
Last updated: 09 May 2026 03:25 UTC
NIST 800-53 r5 controls that address this weakness (0)AI
| Control | Title | Family | Why it addresses this CWE |
|---|---|---|---|
| No NIST controls proposed yet. | |||
Top CVEs of this weakness type, ranked by Risk Priority
| CVE | Risk | CVSS | EPSS | Published |
|---|---|---|---|---|
CVE-2023-31126 | 2.0 | 9.0 | 0.0273 | 2023-05-09 |
CVE-2025-66606 | 1.9 | 9.6 | 0.0006 | 2026-02-09 |
CVE-2024-21864 | 1.6 | 7.8 | 0.0029 | 2024-05-16 |
CVE-2021-33158 | 1.4 | 7.2 | 0.0004 | 2024-02-23 |
CVE-2024-10941 | 1.3 | 6.5 | 0.0031 | 2024-11-06 |
CVE-2025-20166 | 1.1 | 5.4 | 0.0007 | 2025-01-08 |
CVE-2025-20167 | 1.1 | 5.4 | 0.0007 | 2025-01-08 |
CVE-2025-20168 | 1.1 | 5.4 | 0.0007 | 2025-01-08 |
CVE-2026-28417 | 0.9 | 4.4 | 0.0001 | 2026-02-27 |
CVE-2023-22840 | 0.7 | 3.3 | 0.0007 | 2023-08-11 |