Vulnerability in Microsoft Edge Chromium
CVE-2026-58291
Operation on a resource after expiration or release in Microsoft Edge (Chromium-based) allows an unauthorized attacker to disclose information over a network.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.010 (61.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 61st percentile — 61.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000
Affected products
- Microsoft Edge Chromium
- Microsoft Edge (Chromium-Based) — versions 1.0.0.0
Weakness classification (CWE)
References
- Microsoft Edge (Chromium-based) Information Disclosure Vulnerability (vendor-advisory, patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-58291?
- CVE-2026-58291 is a medium-severity vulnerability in Microsoft Edge Chromium, classified under Operation on a Resource after Expiration or Release. CVSS score: 6.1/10. Published 2026-07-03.
- How severe is CVE-2026-58291?
- Medium severity. CVSS v3 base score is 6.1 out of 10.