Quick answers
- Is CVE-2026-66314 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-66314 being exploited in the wild.
- How severe is CVE-2026-66314?
- Medium severity, with a CVSS score of 6.5, published 4 August 2026.
- Which products and versions are affected?
- Microsoft Edge <UNKNOWN>.
- Is there a fix for CVE-2026-66314?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-66314 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-66314?
- Check whether you run Microsoft Edge or Microsoft Edge Chromium at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
A time-of-check time-of-use (TOCTOU) race condition exists in Microsoft Edge (Chromium-based) that enables an attacker to disclose information over the network. The vulnerability arises from a gap between a security check and its use, allowing an attacker to modify state between these two operations. An unauthorized attacker can exploit this flaw via a network vector without authentication. The vulnerability permits information disclosure and potentially other impacts through careful timing of malicious requests.
Affected products
- Microsoft Edge <UNKNOWN>
Timeline
- 2026-08-04: disclosed