Quick answers
- Is CVE-2026-58299 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-58299 being exploited in the wild.
- How severe is CVE-2026-58299?
- High severity, with a CVSS score of 7.5, published 3 July 2026.
- Which products and versions are affected?
- Microsoft Edge < 150.0.4078.48.
- Is there a fix for CVE-2026-58299?
- 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-2026-58299 attacked?
- It is attacked over the network, in a network appliance.
- Am I affected by CVE-2026-58299?
- Check whether you run Microsoft Edge 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 race condition vulnerability (CWE-367) exists in Microsoft Edge (Chromium-based) for Android. The flaw is a Time-of-Check Time-of-Use (TOCTOU) issue that occurs during the processing of web content. An unauthenticated remote attacker can exploit this by enticing a user to visit a malicious webpage or interact with specially crafted content. Successful exploitation requires the attacker to win a timing race, which if successful, allows for arbitrary code execution in the context of the browser. Microsoft has addressed this in version 150.0.4078.48 and later.
Affected products
- Microsoft Edge (Chromium-based) for Android < 150.0.4078.48
Timeline
- 2026-07-03: advisory: Initial advisory published by Microsoft and NVD.