# CVE-2026-70309

## Summary

- **CVE ID:** CVE-2026-70309
- **Severity:** MEDIUM
- **CVSS Score:** 5.4 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C)
- **CWE:** CWE-346
- **Published:** Aug 28, 2026
- **Last Modified:** Sep 10, 2026

## Description

Origin validation error in Microsoft Edge (Chromium-based) allows an unauthorized attacker to bypass a security feature over a network.

## Affected Products

- Microsoft — Microsoft Edge (Chromium-based) (1.0.0.0)

## References

- [CNA](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70309)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.16%
- **EPSS Percentile:** 5.3

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._