CVE-2026-66313
Low
No strong exploitation signal.
CVSS base
6.8
MEDIUM
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
EPSS — probability of exploitation (30 days)
0.2%
6.5th percentile
CISA KEV
Not listed
Weakness / dates
CWE-346
Published 2026-08-04 · modified 2026-08-06
CVSS breakdown
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
| Attack Vector | L | Local |
| Attack Complexity | L | Low |
| Privileges Required | N | None |
| User Interaction | N | None |
| Scope | U | Unchanged |
| Confidentiality | H | High |
| Integrity | L | Low |
| Availability | N | None |
Timeline
- 2026-08-04 — Published (NVD)
- 2026-08-06 — Last modified (NVD)
Description
Origin validation error in Microsoft Edge (Chromium-based) allows an unauthorized attacker to perform tampering locally.