Quick answers
- Is CVE-2026-77490 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-77490 being exploited in the wild.
- How severe is CVE-2026-77490?
- Medium severity, with a CVSS score of 6.1, published 11 September 2026.
- Which products and versions are affected?
- Microsoft Edge <UNKNOWN>.
- Is there a fix for CVE-2026-77490?
- 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-2026-77490 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-77490?
- 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 is a cross-site scripting (XSS) vulnerability in Microsoft Edge's (Chromium-based) web page generation logic. The root cause is improper neutralization of user-controlled input during HTML rendering, allowing an attacker to inject arbitrary JavaScript code that executes in the browser context. The vulnerability requires network access and likely user interaction (visiting a malicious or compromised website); an attacker can achieve arbitrary script execution in the victim's browser with the same privileges as the user. Patches are expected through Microsoft's standard security update process.
Affected products
- Microsoft Edge <UNKNOWN>
Timeline
- 2026-09-11: disclosed