PatchTheCEVCVE-2026-66316: Origin validation error in Microsoft Edge (Chromium-based) allows an unauthorized attacker to perform spoofing
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Routine
MEDIUM 5.4WATCHLISTUPGRADE
CVE-2026-66316 is a medium-severity flaw (CVSS 5.4) affecting edge chromium. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Origin validation error in Microsoft Edge (Chromium-based) allows an unauthorized attacker to perform spoofing over a network.
Why this priority
- On your watchlist
A fixed release or distro patch exists.
Risk facts
| CVSS score | 5.4 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | Required |
| EPSS exploit chance | 0.2% (top 89%) |
| CISA exploited list | No |
| Weakness | CWE-346 |
| Published | 2026-08-04 |
| Last modified | 2026-10-23 |
Publisher (CNA): Microsoft Corporation · Vendor: microsoft
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
microsoft edge chromium UPGRADE
Affected: < 151.0.4129.59
Fixed in: 151.0.4129.59
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy edge-chromium || rpm -q edge-chromium || edge-chromium --version
2. UPGRADE to 151.0.4129.59 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade edge-chromium
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade edge-chromium
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
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.
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
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