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CVE-2026-58291: Microsoft Edge (Chromium-based) Information Disclosure Vulnerability

mediumCVSS 6.1CVE-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.

CSIRTS triage

vendor: Microsoftproduct: EdgeInformation disclosure
What
An operation on a resource after expiration or release allows unauthorized information disclosure.
Who is affected
Users of Microsoft Edge (Chromium-based) are affected.
Urgency
Remediation is urgent due to the medium severity of the vulnerability.
Action
Update to the latest version of Microsoft Edge.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
medium — CVSS 6.1
Published
2026-07-02
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58291

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-58291coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for Microsoft Edge

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

More from Microsoft Security Response Center