CVE-2026-57990: Files or directories accessible to external parties in Microsoft Edge (Chromium-based) allows an unauthorized

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HIGH 7.4WATCHLISTMITIGATE

CVE-2026-57990 is a high-severity flaw (CVSS 7.4) affecting edge chromium. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Files or directories accessible to external parties in Microsoft Edge (Chromium-based) allows an unauthorized attacker to disclose information over a network.

Why this priority

High severity
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.4 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.9% (top 40%)
CISA exploited list	No
Weakness	CWE-552
Published	2026-07-26
Last modified	2026-10-24

Publisher (CNA): Microsoft Corporation · Vendor: microsoft

Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-26 18:18 UTCPublished CVE record published
2026-10-24 13:10 UTCUpdated Record last modified

microsoft edge chromium MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy edge-chromium || rpm -q edge-chromium || edge-chromium --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

Fedora 46 · gnome-shell-extension-tiling-assistant · FIXED · 56-1.fc46 · FEDORA-2026-ebf66a5321 · source

sudo dnf upgrade --advisory=FEDORA-2026-ebf66a5321

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-57990?

edge chromium: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-57990 being exploited?

CVE-2026-57990 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-57990 affect?

CVE-2026-57990 affects edge chromium. Severity is high (CVSS 7.4). Files or directories accessible to external parties in Microsoft Edge (Chromium-based) allows an unauthorized attacker to disclose information over a network.

How urgent is CVE-2026-57990?

Priority 46/100. High severity; On your watchlist

Software pages

Microsoft Edge vulnerabilities · Chromium vulnerabilities

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CVE-2026-57989 HIGH 7.4 UPGRADE Origin validation error in Microsoft Edge (Chromium-based) allows an unauthorized attacker to disclose informa
CVE-2026-57978 MEDIUM 5.4 UPGRADE Origin validation error in Microsoft Edge (Chromium-based) allows an unauthorized attacker to perform spoofing

References

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