Quick answers
- Is CVE-2026-66323 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-66323 being exploited in the wild.
- How severe is CVE-2026-66323?
- Medium severity, with a CVSS score of 5.4, published 28 August 2026.
- Which products and versions are affected?
- Microsoft Edge <UNKNOWN>.
- Is there a fix for CVE-2026-66323?
- 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-2026-66323 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-66323?
- 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
This vulnerability stems from improper neutralization of parameter and argument delimiters in Microsoft Edge (Chromium-based). The flaw allows an unauthorized attacker to execute arbitrary code over a network without requiring authentication. The attack vector is network-based, meaning an attacker can exploit this remotely. Microsoft has released patches to address this issue.
Affected products
- Microsoft Edge <UNKNOWN>
Timeline
- 2026-08-28: disclosed
- 2026-08-28: advisory