How severe is CVE-2026-66326?

CVE-2026-66326 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2026-66326 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-66326?

CVE-2026-66326 affects Microsoft Edge Chromium. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-66326?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2026-66326 published?

CVE-2026-66326 was published on 2026-08-04 and last updated on 2026-08-06.

CVE-2026-66326

CVE-2026-66326 is a medium-severity vulnerability in Microsoft Edge Chromium with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-862.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 1% (53rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-862
Affected product: Microsoft Edge Chromium
Published: 2026-08-04
Last modified: 2026-08-06

Description

Missing authorization in Microsoft Edge (Chromium-based) allows an unauthorized attacker to execute code over a network.

Frequently asked questions

What is CVE-2026-66326?: Missing authorization in Microsoft Edge (Chromium-based) allows an unauthorized attacker to execute code over a network.
How severe is CVE-2026-66326?: CVE-2026-66326 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2026-66326 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-66326?: CVE-2026-66326 affects Microsoft Edge Chromium. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-66326?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2026-66326 published?: CVE-2026-66326 was published on 2026-08-04 and last updated on 2026-08-06.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66326

Affected products (1)

cpe:2.3:a:microsoft:edge_chromium:*:*:*:*:*:*:*:*

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